JP3418302B2 - Fertilizer application structure of rice transplanter - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to planting seedlings by a first seedling planting mechanism at a ground leveling site by a first side ground leveling float of a pair of left and right side ground leveling floats.
There, the seedlings planted have lines to the leveling position by the other of the second side leveling float by the second seedling planting mechanism, third NaeUe the leveling position by center ground leveling float located between a pair of side leveling float In a rice transplanter in which a seedling planting device for planting seedlings by an attachment mechanism is connected to a traveling machine body, it is possible to embed fertilizer in a field near the seedlings planted by the first to third seedling planting mechanisms. The present invention relates to a fertilizer application structure.

[0002]

2. Description of the Related Art In the above rice planting machine, conventionally, as disclosed in, for example, Japanese Patent Laid-Open No. 8-266124, a first fertilizer application nozzle for burying fertilizer in a field near a seedling planting site by a first seedling planting mechanism is used. 2nd on 1st side leveling float
The second fertilizing nozzle for burying the fertilizer in the field near the seedling planting mechanism by the seedling planting mechanism is the second side leveling float, and the third is the fertilizer burying in the field near the seedling planting site by the third seedling planting mechanism. By attaching fertilizer application nozzles to the center leveling float respectively, when performing seedling planting work,
The first to third seedling planting mechanisms made it possible to bury the fertilizer for planted seedlings.

[0003]

Generally, the ground leveling float is attached to the body of the seedling planting device so that it can be raised and lowered so that the seedling planting device can be controlled to move up and down with respect to the traveling body. Then, a fertilizing pump for supplying fertilizer to the fertilizing nozzle is attached to the body of the seedling planting device, and is connected to the fertilizing nozzle through a fertilizing hose. For this reason, conventionally, when the vehicle body of the seedling planting apparatus moves up and down with respect to the field scene by the wheels of the traveling vehicle body getting into the concave portion of the tiller or riding on the convex portion, the vehicle body moves up and down with respect to the leveling float. Since the interval between the fertilizer application pump and the fertilizer application nozzle changed, the fertilizer application hose was bent or extended, causing hose deformation in the fertilizer application hoses connected to all the first to third fertilizer application nozzles.
The object of the present invention is to prevent the change in fertilization depth due to the rolling even when the seedling planting device is connected to the traveling body so as to be capable of rolling control, while the body of the seedling planting device is used in the field. An object of the present invention is to provide a fertilizer application structure capable of performing fertilizer application by reducing the number of fertilizer hoses that are deformed when moving up and down with respect to a surface.

[0004]

The constitution, action and effect of the invention according to claim 1 are as follows.

[Structure] The first seedling planting mechanism performs seedling planting on the ground leveling site by one of the pair of left and right side ground leveling floats by the first side ground leveling float, and the second by the second side ground leveling float on the other side. line seedlings planted by the 2 seedling planting mechanism
There, the fertilizing device structure of rice transplanter which are connected the seedling planting apparatus to vehicle body for performing a seedling planting by a third seedling planting mechanism terrain locations by center ground leveling float located between a pair of side leveling float Attaching the first fertilizer application nozzle for burying fertilizer in the field on the side of the seedling planting site by the first seedling planting mechanism to the first side leveling float, and on the field by the side of the seedling planting site by the second seedling planting mechanism. Attach the second fertilizer nozzle to bury the fertilizer to the second side leveling float ,
The third fertilizer nozzles embedding the fertilizer in the field at the side of the planting locations according to a third seedling planting mechanism is attached to the body of the seedling planting apparatus.

[Operation] As seedlings are planted, a first fertilizer nozzle is provided on the lateral side of the planted seedlings by the first seedling planting mechanism, and a second fertilizer is planted on the lateral side of the planted seedlings by the second seedling planting mechanism. By the nozzle, the fertilizer can be buried by the third fertilizing nozzle on the side of the planted seedling by the third seedling planting mechanism.

Even if the machine body of the seedling planting apparatus goes up and down with respect to the field scene such that the traveling machine body goes into the concave portion of the cultivator or rides on the convex portion, the third fertilizer application nozzle is supported by the mechanical body. The distance between the fertilizer application nozzle and fertilizer application pump does not change,
The fertilizing hose connecting the fertilizing nozzle to the fertilizing pump can be fertilized while preventing the deformation such as the bending or the extension which has been conventionally caused by the change in the interval.

Further, the seedling planting device can be controlled to roll with respect to the traveling machine body, and even if the control is performed, the fertilization depth of any one of the first to third fertilization nozzles is changed. If you don't, or if it changes, fertilizer will be applied in a state where it does not change significantly.

That is, when the rolling control of the traveling machine body of the seedling planting apparatus is performed, the machine body of the seedling planting apparatus rotates about the center side in the left-right direction as the rolling center, and the center side of the machine body with respect to the field scene. It does not move up and down, or even if it moves up and down, it moves up and down with a relatively small stroke, and both ends move up and down over a relatively large stroke with respect to the field scene.
The first fertilizing nozzle and the second fertilizing nozzle are located on the lateral end side of the seedling planting device so as to fertilize for planting seedlings by the first or second seedling planting mechanism, and the third fertilizing nozzle is It is located on the center side of the seedling planting device so that fertilizer is applied for planting seedlings by the third seedling planting mechanism. For this reason, in the case of the first fertilizer application nozzle and the second fertilizer application nozzle, when they are supported by the machine body, they are supported on the lateral end side thereof. On the other hand, the depth of entry into the field changes relatively greatly by moving up and down over a relatively large stroke, but because it is supported by the first or second side leveling float, the rolling control of the seedling planting device can be performed. Even if the lateral end side of the machine body is moved up and down with respect to the field scene, it will be located on the field side together with the side soil float, and the depth of entry into the field will not change. Even if the rolling stroke of the seedling planting device is large and the side leveling float may ascend on the aircraft, the ascending stroke of the float is smaller than the ascending stroke of the aircraft. The depth of entry of the fertilizer nozzle into the field changes only a small amount. Further, in the third fertilizer application nozzle, even if it is supported by the machine body, it is also supported inward in the lateral direction, so even if the rolling control of the seedling planting device is performed, the third fertilizer application nozzle is sent to the field. The depth of penetration of the does not change, or even if it changes, only a relatively small amount changes.

[Effect] Even when the raising and lowering control and the rolling control of the seedling planting device are performed, the fertilization depth is constant for the planted seedlings by any of the first to third seedling planting mechanisms. Alternatively, fertilization can be performed in an advantageous state in which fertilization accuracy is almost constant and the fertilization hose connected to the third fertilization nozzle among the first to third fertilization nozzles is not easily deformed and can be used for a long time. .

The structure, operation and effect of the invention according to claim 2 are as follows.

[Configuration] In the configuration of the invention according to claim 1, the forward rising inclination angle of the third fertilizer application nozzle is smaller than the forward rising inclination angle of the first fertilizer application nozzle and the second fertilizer application nozzle.

[Operation] Since the first and second fertilizer application nozzles are supported by the side leveling float,
Contaminants are in a state where they easily flow around the side leveling float, bypassing the fertilizer application nozzle. Since the third fertilizer application nozzle is supported by the machine body, foreign matter is likely to hit the fertilizer application nozzle. That is, the first and second fertilizer application nozzles are in a state in which foreign substances are less likely to be caught than the third fertilizer application nozzle. Therefore, the first and second
The fertilizer application nozzle is shorter than the third fertilizer application nozzle, and while the first to third fertilizer application nozzles are not easily caught by foreign matter, the first to third fertilizer application nozzles are the same as the planted seedling in a side view of the machine. Fertilization can be applied at the location.

[Effect] The first to third fertilizer application nozzles are in a state in which it is difficult for foreign matter to be caught in any of the first to third fertilizer application nozzles to cause problems such as mud pushing, and the first and second fertilizer application nozzles are relatively short. The fertilizer can be fertilized in an advantageous state such that it is less likely to be clogged with fertilizer.

The structure, operation, and effect of the invention according to claim 3 are as follows.

[Configuration] In the configuration of the invention according to claim 1 or 2, the fertilization depth by the third fertilization nozzle is in a state in which the planting depths by the first to third seedling planting mechanisms are in the center of the adjustable range. The fertilizing depth by the third fertilizing nozzle is set so that the fertilizing depth becomes equal to the center of the adjustable range of the fertilizing depth by the first and second fertilizing nozzles.

[Operation] Since the first and second fertilizer application nozzles are supported by the side leveling float,
When changing the planting depth, by adjusting the height of the fertilizer application nozzle, the positional relationship between the planting seedlings and the fertilizer application area in the vertical direction of the machine can be made the same as that before the planting depth was changed. is there. The third fertilizer nozzle is supported by the machine body and moves up and down together with the machine body to the field. Even if the planting depth is changed or the mounting height is not adjusted, the planting seedlings and fertilizer application area The positional relationship in the vertical direction of the aircraft is the same as that before the planting depth was changed. Therefore, even if the height of the third fertilizer application is not adjustable, even if the height of the third fertilizer application is adjustable, if the fertilization depth is adjusted to the set fertilization depth, the first and If the mounting height of the second fertilizing nozzle is properly adjusted, it is possible to adjust the mounting height of the third fertilizing nozzle without adjusting the mounting height of the first to third fertilizing nozzles in the vertical direction of the machine body between the fertilizing portion and the planted seedlings. The positional relationship is the same as before the planting depth was changed.

[Effect] Even when the planting depth is changed,
Of the first to third fertilizer application nozzles, the first fertilizer application nozzle and the second fertilizer application nozzle only require a relatively small amount of adjustment work to change the mounting height, or the third fertilizer application nozzle cannot be adjusted in height. Even if the attached structure is simple, fertilization work can be performed by making the positional relationship between the fertilization locations of the first to third fertilization nozzles and the planting seedlings in the machine up-down direction the same as before planting depth change, It is advantageous in terms of operation and structure.

The constitution, action and effect of the invention according to claim 4 are as follows.

[Configuration] In the configuration of the invention according to any one of claims 1 to 3, the third seedling planting mechanism and the third
A pair of left and right fertilizer application nozzles are provided in the seedling planting device, and this seedling planting device is provided in one of the third seedling planting mechanism of the pair of third seedling planting mechanisms and the pair of third fertilizer application nozzles. One of the third fertilizer application nozzle, the first side ground leveling float, the first divided seedling planting device portion including each of the first seedling planting mechanism, and the other of the pair of third seedling planting mechanism Second split seedling planting device including the third seedling planting mechanism, the other third fertilizing nozzle of the pair of third fertilizing nozzles, the second side leveling float, and the second seedling planting mechanism. While divided into parts, both divided seedling planting device parts are in a working state in which they are connected to the traveling machine body in a lateral posture along the lateral direction of the traveling machine body, and in a forward-backward posture along the longitudinal direction of the traveling machine body,
In addition, the center ground leveling float is configured to be switchable between a folding storage state in which the center ground leveling float is connected to the traveling vehicle body in a state of being located on the rear side of the traveling vehicle body with respect to the second side ground leveling float.

[Operation] During traveling or transportation, the seedling planting apparatus is folded and stored.
The width of the seedling planting device can be made narrower than that in the working state. Also, when storing this fold,
Since the center leveling float is located on the rear side of the second side leveling float, if the third fertilizing nozzle is supported by the center leveling float, the seedling planting device is folded and stored, and the traveling body is in the forward rising posture. If it happens, the third fertilizing nozzle is likely to be grounded and deformed or damaged. However, the third fertilizer application nozzle is supported by the planting machine, and when the seedling planting apparatus is folded and stored, it is located in front of the center ground leveling float, so that the traveling machine body is in the forward rising posture. Also, the third fertilizing nozzle is less likely to be deformed or damaged due to grounding.

[Effect] When the seedling planting device is folded and stored so that its lateral width is narrowed so that it is easy to operate and does not stick out from the cargo bed and is in a safe state such as when traveling or carrying, the third fertilizer application It is easy to avoid that the nozzle is deformed or damaged.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION As shown in FIG. 1, a pair of right and left front and rear wheels 1 and 1 that can be freely driven and a pair of left and right rear wheels 2 and 2 that can be freely driven are self-propelled and the engine bonnet is A lift cylinder 4 is used to swing up and down at the rear of the traveling machine body including the spare seedling stand 3 located on both sides, the first fertilizer tank T1, the second fertilizer tank T2 located on the side of the driver's seat S, and the like. The seedling planting device 10 is connected to the seedling planting device 10 through the link mechanism 5 so as to be moved up and down, and power is transmitted from the traveling machine body to the seedling planting device 10 by the rotating shaft 6. The fertilizer pumps P1 to P5 located above the rear part of the machine body of the seedling planting device 10 and the pump cover K covering the fertilizer pumps P1 to P5 are provided, and the paste fertilizer from the fertilizer pumps P1 to P5 is used by the fertilizer nozzles 31 to 35 in the field. The seedling planting device 10 is provided with the fertilizer application device 30 to be supplied to the seedling planting device 10, so that the seedling planting mechanisms 11a, 11b, 11c of the seedling planting device 10 can be used to plant seedlings in the field, and at the same time as this seedling planting work, near the planted seedlings A rice transplanter with a riding-type fertilizer application is configured so that the fertilizer work for burying the paste fertilizer can be performed.

The seedling planting device 10 is constructed as shown in FIGS. That is, the first connecting link 15a, one end of which is connected to the left end of the traveling frame of the connecting frame 7 that is connected to the free end side of the link mechanism 5 for connecting the seedling planting device, the first connecting link 15a The main frame 16 to which the bracket portion 16a is connected to the other end side, the input case 17 connected to the first connecting link 15a together with the main frame 16 by connecting to the bracket portion 16a, and both ends of the main frame 16 The planting drive case 18 whose front end side is connected, and the transmission case 19 for transmitting power from the input case 17 to the pair of planting drive cases 18, 18 constitute a left side body part, and the connecting frame 7 is provided on the right side of the traveling machine body. The second connecting link 15b, one end of which is connected to the end, and the bracket portion 1 on the other end of the second connecting link 15a. a is connected to the main frame 16, an input case 17 is connected to the second connecting link 15b together with the main frame 16 by being connected to the bracket portion 16a, and front ends are connected to both ends of the main frame 16. The right drive part is constituted by each of the planting drive case 18 and the transmission case 19 for transmitting power from the input case 17 to the pair of planting drive cases 18, 18, and the right side airframe part, the left side airframe part, and the connecting frame. 7 and 7, a planting machine body that is a machine body of the seedling planting apparatus 10 is configured.

The seedling planting mechanism 11 is provided on both lateral sides of the rear end portions of the two planting drive cases 18, 18 of the left-side body portion.
a and 11c are drivably attached, and the seedling planting mechanisms 11b and 11c are drivably attached to both lateral sides of the rear end portions of the two planting drive cases 18 and 18 of the right body part,
The seedling placing table 12 is slid over the seedling placing table guide rails 13 supported by the rear end side of all the planting drive cases 18 and the seedling placing table columns 22 standing on the bracket portions 16a of the left and right body parts. The first side ground leveling float 14a is supported by the float support cylinder 25 supported by the left side body part, and the second side leveling float 14b and the center leveling float 14c are supported by the float support cylinder 25 supported by the right side body part. I am supported.

Each of the seedling planting mechanisms 11a to 11c comprises a rotating case C rotatably supported by a planting drive case 18, and a planting arm A rotatably attached to both ends of the rotating case C. As the rotating case C is driven,
While the pair of planting arms A and A revolve around the rotation axis of the rotating case C, the planting arm drive mechanism (not shown) installed in the rotating case C rotates about the rotating case C. One of the mat-shaped seedlings that rotates and the seedling planting claws provided on one planting arm A and the seedling planting claws provided on the other planting arm A are alternately placed on the seedling placing table 12. The block seedlings are cut and taken out, and they are brought into the mud portion of the field and planted.

The seedling table horizontal feed shaft 23 is rotatably supported by the input case 17 on the left side machine body, and one end side is engaged with the spiral groove of the seedling table horizontal feed shaft 23, and the lateral feed is carried out. The other end of the seedling table horizontal feed rod 24 reciprocally transferred by the shaft 23 is connected to the seedling table 12, and the seedling table 12 is interlocked with the seedling planting movements of the seedling planting mechanisms 11a to 11c. It is configured to be reciprocated along the guide rail 13.

As shown in FIG. 8, each leveling float 14a
14c are connected to the float supporting arms 29a and 29b extending from the float supporting cylinder 25 so as to be rotatable, so that the leveling floats 14a to 14c can be rotated around the axis L located on the rear end side. It is configured to swing up and down with respect to the planting machine. An elevating control mechanism (not shown) including a rotary potentiometer (not shown) interlocked with vertical swing of the center leveling float 14c so as to detect the mounting posture of the center leveling float 14c with respect to the planting machine is provided in the traveling machine body. At the same time, the lifting control mechanism detects the height of the planting machine with respect to the mud surface of the field based on the detection result of the potentiometer, and automatically operates the lift cylinder 4 so that the detection result falls within the set range. Configured. That is, even if the traveling machine body tilts back and forth due to unevenness of the tiller, the lifting control mechanism causes the height of the seedling planting apparatus 10 with respect to the mud surface of the planting machine to fall within the set range. Is automatically moved up and down with respect to the traveling machine body to keep the planting depth by the seedling planting mechanisms 11a to 11c substantially constant.

As shown in FIG. 6, the connection frame 7 is supported by the support member 5a of the link mechanism 5 so as to rotate around the axis Z in the longitudinal direction of the traveling machine body, and the seedling planting device 10 is connected. Enables rolling around the axis Z with respect to the traveling body. The tilt sensor 59 attached to the seedling support column 22 is configured to detect the tilt direction and tilt angle of the seedling planting device 10 in the lateral direction of the machine body, and is linked to the tilt sensor 59. A rolling control mechanism 50 including an electric rolling motor M is attached to the support member 5a. In the rolling control mechanism 50, the rolling motor M is driven based on the information from the tilt sensor 59, and the lateral feed screw shaft 5 is driven.
By rotating 1 the rolling operation tool 52 screwed to the lateral feed screw shaft 51 is moved in the lateral direction of the machine body, and the rolling operation tool 52 is attached to the seedling stand column 22 of the left machine body part. The left side body part is pulled by the connecting rod 53 and the coil spring 54, which are connected to each other, and the rolling operation tool 52 is connected to the seedling stand column 22 of the right side body part. The seedling planting device 10 is rolled by pulling and operating the right side body part via the. Then, the rolling operation is performed so that the detection result of the tilt sensor 59 becomes a horizontal or substantially horizontal detection result. That is, even if the traveling body tilts to the left or right due to the unevenness of the tiller, the rolling control mechanism 50 causes the seedling planting device 1 to operate.
0 is automatically rolled on the mud surface so that it is horizontal or nearly horizontal when viewed from the front and rear of the machine.
The planting depth on the left and right sides of 0 will be maintained at approximately the same depth. The coil spring 55 shown in FIG. 6 is attached across a spring support tool 56 included in the seedling placing table 12 and a spring support tool 58 included in a support column 57 standing on the supporting member 5a, so that the seedling placing table 12 can be moved laterally. This prevents the left and right weight balance of the whole seedling planting apparatus 10 from being lost due to the weight of the fed seedlings.

As shown in FIGS. 2 and 3, the seedling placing table 1
2 and the seedling placing table guide rail 13 are configured to be divided into two divided seedling placing table portions 12a and 12b and divided seedling placing table guide rail portions 13a and 13b at the dividing line Y, and the first connecting link 15a and the first connecting link 15a The 2 connecting link 15b is rotated with respect to the connecting frame 7 about the axial center X1 of the connecting shaft connecting the connecting links 15a and 15b and the connecting frame 7 in the vertical direction of the machine body.
Also, the connecting links 15a and 15b and the bracket portion 16a
Is configured to rotate relatively to the main frame 16 around the axis X2 of the connecting shaft connecting the and
The seedling planting device 10 is divided into two divided seedling planting device parts 10a, 1
It can be divided into 0b. That is, the left-side machine body portion, one divided seedling placing table portion 12a, one divided seedling placing table guide rail portion 13a, the seedling planting mechanism 11a to.
Of the three 11c, the first of the three supported by the left body part
Seedling planting mechanism 11a and one third seedling planting mechanism 11c, first
A first divided seedling planting device portion 10a provided with each of the side soil floats 14a, the right side body portion, the other divided seedling placing base portion 12b, the other divided seedling placing base guide rail portion 13b, and the seedling planting mechanism 11a to. A second split seedling provided with three second seedling planting mechanisms 11b and one third seedling planting mechanism 11c supported by the right-side body part of 11c, a second side leveling float 14b, and a center leveling float 14c. It is configured so that it can be divided into the planting device portion 10b. Then, both split seedling planting device portions 10a, 1
0b by changing the connecting attitude of the connecting links 15a, 15b with respect to the connecting frame 7 and the connecting attitude of the main frame 16 with respect to the connecting links 15a, 15b, the seedling planting device 10 is divided into two split seedling planting device parts 10a, 1
0b is connected to the traveling body as shown in FIG.
Both of the divided seedling planting device portions 10a and 10b can be switched to a folded storage state in which they are connected to the traveling machine body as shown in FIG.

That is, as shown in FIG. 2, the first connecting link 15a and the second connecting link 15b are placed in a connecting posture in which they extend laterally of the traveling machine body from the connecting frame 7, and the main parts of both split seedling planting device parts 10a and 10b are connected. The frame 16 is connected to the rear side of the connecting links 15a, 15b by the connecting links 15a, 1
The connecting posture is parallel to 5b. Then, the divided seedling planting device portions 10a and 10b are the seedling planting mechanisms 11a and 1a.
1b, 11c in parallel direction, divided seedling platform portion 12a,
The lateral direction of 12b is along the lateral direction of the traveling machine body, and the front and rear directions of the ground leveling floats 14a to 14c are in a lateral posture in which the front and rear directions are along the longitudinal direction of the traveling machine body. Connected to the seedling planting device 10
Is in working condition. At this time, both split seedling planting device parts 1
The rear end sides of the planting drive cases 18 of 0a and 10b are connected to each other by a connecting rod 26, and both split seedling planting device parts 10
The a and 10b are fixed in the connected posture in the working state. In addition, the output shaft 8a of one of the pair of left and right output shafts 8a, 8a of the transmission case 8 configured to input the rotational force of the rotary shaft 6 and attached to the lower side of the connecting member 7 A transmission shaft 27 for transmitting power to the input case 17 of the split seedling planting device portion 10a is connected, and a transmission shaft 27 for transmitting power to the input case 17 of the second split seedling planting device portion 10b is connected to the other output shaft 8a. Connect and divide both seedling planting device parts 10a, 10b
The lateral feeding drive of the seedling planting mechanisms 11a to 11c and the first divided seedling placement base portion 12a of the first divided seedling planting device portion 10a is enabled. Furthermore, both split seedling planting device portions 10a, 1
0b of the divided seedling placing base portions 12a and 12b are brought close to each other and connected by a connecting means (not shown) so that the second divided seedling placing base portion 12b can be laterally driven together with the first divided seedling placing base portion 12a. To do. Then, the seedling planting device 10
The first side ground leveling float 14a is attached to one side of the work area by the first side ground leveling float 14a, and the other side of the work side is connected to the first side ground leveling float 14b as the aircraft travels.
The second and third side leveling floats 14b are respectively leveled by a center leveling float 14c, and the third innermost one of the four seedling planting mechanisms 11a and 11c of the first divided seedling planting device portion 10a is located inside the body. The three first seedling planting mechanisms 11a other than the seedling planting mechanism 11c perform seedling planting on the ground leveling site by the first side ground leveling float 14a, and the second
Four seedling planting mechanisms 11b of the divided seedling planting device portion 10b,
Three second seedling planting mechanisms 11b other than the third seedling planting mechanism 11c, which is located on the innermost side of the airframe among the 11c, plant seedlings on the ground leveling site by the second side ground leveling float 14b, and the first split seedlings are planted. Third seedling planting mechanism 1 of planting mechanism 10a
1c and the third seedling planting mechanism 1 of the second split seedling planting mechanism 10b
Two third seedling planting mechanisms 11c including 1c plant seedlings on the ground leveling site by the center ground leveling float 14c.

Then, as shown in FIG. 3, the transmission shafts 27 of the split seedling planting device portions 10a and 10b are separated from the output shaft 8a of the transmission case 8, and the connecting rod 26 is removed to remove the split seedlings. The posture of the planting device parts 10a and 10b can be changed. And the 1st connection link 15a and the 2nd connection link 15b are made into the connection attitude | position which extends to the back of a traveling machine body from the connection member 7, and the main frame 16 of both split seedling planting apparatus parts 10a, 10b is connected link 1.
The connecting posture is set so as to be parallel to the connecting links 15a and 15b on the lateral outside of 5a and 15b. Then, the divided seedling planting device portions 10a, 10b are connected to the seedling planting mechanisms 11a, 11b, 1 respectively.
The parallel direction of 1c and the lateral direction of the divided seedling platform parts 12a and 12b are along the front-back direction of the traveling body, and the ground float 1
4a to 14c are in a front-back orientation in which the front-rear direction is along the lateral direction of the traveling machine body, and both split seedling planting device portions 10
a, 10b side leveling floats 14a, 14b front end sides face each other and center leveling float 14
The c is connected to the traveling machine body while being folded so as to be aligned in the lateral direction of the traveling machine body in a posture in which c is located on the rear side of the traveling machine body with respect to the second side leveling float 14b, and the seedling planting device 10 is in the retracted state. At this time, the first divided seedling planting device portion 10a
The float support cylinder 25 included in and the float support cylinder 25 included in the second divided seedling planting device portion 10b are joints 25a.
To separate by.

As shown in FIGS. 4 and 7, a pair of planting drive cases 18, 1 of the first divided seedling planting device portion 10a.
The first pump mounting base 3 which is supported by 8 via the leg portions 36a
6, two fertilizer pumps P1 and P3 attached to 6, and a pair of planting drive cases 18 of the second divided seedling planting device portion 10b,
Two fertilizer pumps P2 and P3 attached to the second pump mount 39 which 18 supports via the leg portions 39a, and the first split seedling planting device portion of these four fertilizer pumps P1, P2 and P3 First fertilizing pump P1 and third provided in 10a
Fertilizer application hoses 31a and 33 are provided at the fertilizer delivery part of the fertilizer application pump P3.
The first fertilizer application nozzle 31 and the third fertilizer application nozzle 33, which are separately connected via a, and the four fertilizer application pumps P1, P2.
The second fertilization nozzle 32 that is separately connected to the fertilizer delivery parts of the second fertilization pump P2 and the third fertilization pump P3 of the second split seedling planting device portion 10b of P3 via fertilization hoses 32a and 33a. And the third fertilizer nozzle 33 constitute a deep fertilizer applicator, and three fourth fertilizer pumps P4 and the second fertilizer pump P4 mounted on the first pump mount 36 are provided.
Five fifth fertilizing pumps P5 attached to the pump mount 39, and the first of these eight fertilizing pumps P4, P5
The fourth fertilizer nozzle 34, which is separately connected to the fertilizer delivery portions of the three fourth fertilizer application pumps P4 provided in the divided seedling planting device portion 10a via the fertilizer hoses 34a, and the eight fertilizer pumps P4 and P5. The side strip fertilizer application is performed by each of the fifth fertilizer application nozzles 35 that are separately connected to the fertilizer delivery parts of the five fifth fertilizer application pumps P5 included in the second divided seedling planting device portion 10b of the fifth fertilizer application nozzles 35. The side-row fertilizer applicator and the deep-layer fertilizer applicator constitute the fertilizer applicator 30.

The first fertilizer application nozzle 31 of the deep fertilizer applicator
Is a paste deeper than the fertilization nozzles 34, 35 of the lateral row fertilizer application in the field mud between the seedling planting points by the two first seedling planting mechanisms 11a located on the lateral outside of the first seedling planting device portion 10a. The fertilizer is arranged so as to be buried and attached to the first side leveling float 14a, and the second fertilizer application nozzle 32 is provided with two second fertilizer application nozzles located outside the second seedling planting device portion 10b.
Arranged so as to bury the paste fertilizer deeper than the fertilization nozzles 34, 35 of the side-row fertilizer application in the field mud between the seedling planting mechanisms 11b and attached to the second side leveling float 14b. 3 fertilizer nozzle 33, 33
The third fertilizing nozzle 33, which is located in the first divided seedling planting device portion 10a, is the first divided seedling planting device portion 10a.
The third seedling planting mechanism 11c located in the
Arranged so that the paste fertilizer is buried deeper than the fertilizer application nozzles 34, 35 of the lateral fertilizer applicator in the field mud between the seedling planting mechanism 11a and the seedling planting site, and the paste is applied to the main frame 16 of the left body part, 2 split seedling planting equipment part 1
The third fertilizing nozzle 33 located at 0b is located between the third seedling planting mechanism 11c located at the second divided seedling planting device portion 10b and the second seedling planting mechanism 11b adjacent thereto. Fertilizer nozzles 34, 35 of side-row fertilizer applicator for field mud
It is arranged so as to bury the paste fertilizer deeper than that and is attached to the main frame 16 of the right side body part.

The three fourth fertilizer nozzles 34 of the lateral strip fertilizer applicator
Are located one by one near the lateral sides of the three first seedling planting mechanisms 11a located in the first seedling planting device portion 10a, and are located near the lateral sides of the seedling planting locations by the first seedling planting mechanism 11a. Arranged so that the paste fertilizer is embedded in the mud and attached to the first side leveling float 14a, and five fifth fertilizer application nozzles 3
5 is a third seedling planting mechanism 11c located in the first divided seedling planting device portion 10a, one third seedling planting mechanism 11c located in the second seedling planting device portion 10b and three second seedlings. Planting mechanism 1
One seedling planting mechanism 11 is located near the lateral side of 1b.
It is arranged so that the paste fertilizer is buried in the field mud near the lateral side of the seedling planting location by b and 11c, and is distributed and attached to the second side leveling float 14b and the center leveling float 14c.

As shown in FIGS. 4 and 5, the fertilizer receiving portions of the first fertilizing pump P1 and the third fertilizing pump P3 located in the first divided seedling planting device portion 10a are communicated with each other,
From the fertilizer receiving part of the first fertilizer pump P1 to the fertilizer feed pipe 4
5a is extended downward in the machine body, and the fertilizer feed pipe 45a passes through the lower part of the machine body of the first divided seedling planting device portion 10a in the front-rear direction, and the flexible hose 46a. The three fertilizer tanks T1, T2
The second fertilizer pump P2, which is connected to the second fertilizer tank T2 by the flexible hose 46b connected to the fertilizer delivery part of the second fertilizer tank T2 of the second fertilizer tank T2, and is located in the second split seedling planting device portion 10b. The fertilizer receiving part of the third fertilizing pump P3 is communicated with the fertilizer receiving part of the third fertilizing pump P3, and the fertilizer feeding pipe 45b is extended downward from the fertilizer receiving part of the third fertilizing pump P3. By connecting to the flexible hose 46b through a flexible hose 46c that passes in the front-rear direction below the body part of the attachment device part 10b, the four fertilizer pumps P1, P2 of the deep-layer fertilizer applicator.
P3 is connected to the second fertilizer tank T2. Three fourth fertilizer application pumps P located in the first divided seedling planting device portion 10a
4 fertilizer receiving portions are communicated with each other, and the fertilizer feeding pipe 42a is extended downward from the fertilizer feeding pipe 42a from the fertilizer receiving portion of one of the fourth fertilizing pumps P4 located at the end of the pump group, and the fertilizer feeding pipe is 42a, a flexible hose 43a passing through the lower part of the body of the first divided seedling planting device portion 10a in the front-rear direction, and the hose 43a is connected to the two first fertilizers of the three fertilizer tanks T1 and T2. Two flexible hoses 43b, 4 respectively connected to the fertilizer delivery section of the tank T1
3b is connected to the two first fertilizer tanks T1, 1 and the fertilizer receiving parts of the five fifth fertilizer application pumps P5 located in the second divided seedling planting device portion 10b are communicated with each other, One fifth fertilizer pump P located at the end
The fertilizer feeding pipe 42b is extended downward from the fertilizer receiving portion of No. 5 and the fertilizer feeding pipe 42b is moved to the second position.
Eight fertilizer pumps of a side-row fertilizer applicator by connecting to the two flexible hoses 43b and 43b by a flexible hose 43c that passes in the front-rear direction below the body part of the split seedling planting device part 10b. P4 and P5 are connected to two first fertilizer tanks T1 and T1.

As shown in FIGS. 4, 5 and 7, the input shafts of the first transmission M1 and the fourth transmission M4 supported by the first pump mount 36 are connected to the first split seedling planting device portion. The transmission shaft 28 extending from the power take-out portion 19a of the transmission case 19 of 10a to a position below the first pump mount 36.
Of the first transmission device M1 to the input shaft of the first fertilizer pump P1 by the transmission chain, and the input shaft of the first fertilizer pump P1 and the third fertilizer pump. A transmission chain is wound around the input shaft of P3, and the output shaft of the fourth transmission M4 is linked to the input shaft of one of the four fourth fertilization pumps P4 by the transmission chain. From the transmission case 19 by winding the transmission chain around the input shafts of two adjacent pumps P4 and P4 of the three fourth fertilization pumps P4 and interlocking the three fourth fertilization pumps P4. Is transmitted to the first fertilizer pump P1 and the third fertilizer pump P3 via the first transmission M1, and the three fourth fertilizer pumps P3 and P4 are transmitted via the fourth transmission M4.
The fertilizer pumps P1 and P that are configured to be transmitted to the fertilizer pump P4 and are located in the first divided seedling planting device portion 10a.
2 and P4 can be driven. A second transmission M2 and a fifth transmission M supported by the second pump mount 39.
The input shaft 5 is connected to the extended end of the transmission shaft 28 extending from the power take-out portion 19a of the transmission case 19 of the second split seedling planting device portion 10b to the lower side of the second pump mount 39 by a transmission chain. The output shaft of the second transmission M2 is interlocked with the input shaft of the third fertilizer pump P3 by a transmission chain, and the transmission chain is extended between the input shaft of the third fertilizer pump P3 and the input shaft of the second fertilizer pump P2. The output shaft of the fifth transmission M5 is wound around and the input shaft of one of the five fifth fertilization pumps P5 is linked by a transmission chain, and the output shaft of the fifth transmission M5 is adjacent to the fifth fertilization pump P5. By rotating the transmission chain around the input shafts of the two pumps P5 and P5 that are in tandem and interlocking the five fifth fertilization pumps P5, rotation from the transmission case 19 is performed. The force via the second transmission M2 2
The fertilizer pump P2 and the third fertilizer pump P3 are transmitted to the fifth
It is configured to be transmitted to the five fifth fertilizer application pumps P5 via the speed change device M5, and each fertilizer application pump P2, P3, P5 located in the second divided seedling planting device portion 10b can be driven. .

As a result, the deep fertilizer application of the fertilizer applicator 10 uses the first fertilizer pump P1 to apply the paste fertilizer stored in the second fertilizer tank T1 to the first fertilizer nozzle 3
1, the second fertilizer pump 32 is used to feed the second fertilizer nozzle 32.
To the third fertilizing nozzle 33 by the third fertilizing pump P3. Then, by the first fertilizer nozzle 31, by the second fertilizer nozzle 32, in the field on the side of the seedling planting location by the two outer first nursery planting mechanisms 11a of the three first nursery planting mechanisms 11a. In the field on the side of the seedling planting place by the two outer second seedling planting mechanisms 11b of the three second seedling planting mechanisms 11b, the first seedling planting mechanism is provided by the third fertilizing nozzle 33 on one side. 11a and 3rd seedling planting mechanism 1
In the field on the side of the seedling planting point by 1b, the other third
By the fertilizer application nozzle 33, the paste fertilizer is buried deeper than the side-row fertilizer application in the fields on the sides of the seedling planting locations by the second seedling planting mechanism 11b and the third seedling planting mechanism 11c. The lateral strip fertilizer application of the fertilizer applicator 10 uses the paste fertilizer stored in the two first fertilizer tanks T1 as the fourth fertilizer.
The fertilizer pump P4 supplies the fourth fertilizer nozzle 34 and the fifth fertilizer pump P5 supplies the fifth fertilizer nozzle 35. Then, by the fourth fertilizer nozzle 34, in the field near the side of the seedling planting location by the first seedling planting mechanism 11a,
The fifth fertilizer nozzle 35 is used to bury the paste fertilizers in the fields near the lateral sides of the seedling planting locations by the second seedling planting mechanism 11b and the third seedling planting mechanism 11c.

That is, when carrying out the planting work, the traveling machine body is run with the seedling planting device 10 in the connected posture in the working state. Then, each leveling float 14a, 14b, 14
The planned seedling planting site is rectified by c, and the three first seedling planting mechanisms 11a of the first divided seedling planting device portion 10a carry out seedling planting at the landslide site by the first side landscaping float 14a. Three second seedling planting mechanisms 11b of the second divided seedling planting device portion 10b carry out seedling planting on the ground-laying portion by the two-side land-laying float 14b, and the first splitting is made on the land-laying portion by the center ground-laying float 14c. The third seedling planting mechanism 11c of the seedling planting device portion 10a and the third seedling planting mechanism 11c of the second divided seedling planting device portion 10b perform seedling planting, so that eight-row seedling planting can be performed. Then, even if the traveling machine body tilts back and forth, the raising / lowering control mechanism controls the raising / lowering of the seedling planting device 10, whereby each seedling planting mechanism 1
While keeping the planting depth by 1a to 11c substantially constant, and even if the traveling body inclines to the left and right, the rolling control mechanism 50 controls the seedling planting device 10 to roll so that the left and right planting depths are substantially the same. Can be planted while maintaining. Furthermore, by the operation of the fertilizer application device 10,
It is possible to perform fertilization work by burying paste fertilizer both at a relatively shallow location near the lateral side of each Hachijo planting seedling and at a location that is relatively far away from this planting seedling laterally and deeper than this location. . When carrying out traveling or carrying, the lateral width of the seedling planting device 10 can be made narrower than that during work by putting the seedling planting device 10 in the folded and stored state.

The first fertilizer application nozzle 31 and the second fertilizer application nozzle 32 of the deep-layer fertilizer application are attached to the side leveling floats 14a and 14b by the attachment structure shown in FIG. That is, the nozzle insertion hole 60 is provided on the front end side of the floats 14a and 14b, and the nozzle mounting bracket 61 is fixed, and the fertilizer application nozzles 31 and 32 are located on the float upper surface side of the insertion hole 60 of the base end side. At the same time, the bracket 61 connects the end portion where the fertilizer hoses 31a and 32a are connected to each other with the axial center 61a of the float lateral direction.
It is fixed to a nozzle support 62 which is rotatably supported around the nozzle support 62. Then, by swinging the nozzle support tool 62 with respect to the bracket 61, the fertilizer application nozzle 3
The tip end side where the fertilizer discharge ports 31b, 32b of 1, 32 are located can be swingably adjusted so as to move up and down with respect to the floats 14a, 14b around the shaft core 61a, and is supported by the nozzle support tool 62 so as to be able to move back and forth. In addition, a position fixing projection 63 that is biased toward the bracket 61 by a lock spring (not shown) is provided in one positioning hole 64, 64a selected from a plurality of positioning holes 64, 64a provided in the bracket 61. Fertilization nozzle 3 by engaging
1, 32 can be fixed to the adjustment position, and the nozzle support tool 62 is rockably operated with respect to the bracket 61, so that the fertilization depth by the fertilization nozzles 31 and 32 is set to the deepest position D and the shallowest position U. It can be adjusted between.

The third fertilizer nozzle 33 of the deep fertilizer applicator
Are attached to the main frame 16 of the planting machine by the attachment structure shown in FIG. That is, the stay 70 fixed to the main frame 16 is made to support the nozzle mounting bracket 71 extending from the planting machine front side to the end, to which the fertilizing hose 33a on the base end side of the fertilizing nozzle 33 is connected. A bracket 71 is fixed to a nozzle support 72 that is rotatably supported around an axis 71a in the lateral direction of the planting machine. Then, by swinging the nozzle support tool 72 with respect to the bracket 71, the tip end side of the fertilizer application nozzle 33 where the fertilizer discharge port 33b is located is swung so as to move up and down with respect to the main frame 16 around the shaft core 71a. The bracket 71 is provided with a plurality of position fixing projections 73 that can be dynamically adjusted and are supported by the nozzle support 72 so as to be able to move back and forth and are biased to project toward the bracket 71 by a lock spring (not shown). By engaging one positioning hole 74, 74a selected from the positioning holes 74, 74a, the fertilizer application nozzle 33
The nozzle support 7
By swinging 2 with respect to the bracket 71,
The fertilizing depth by the third fertilizing nozzle 33 can be adjusted between the deepest position D and the shallowest position U.

The first and second fertilizer application nozzles 31, 32
Is fixed by the positioning hole 64a located in the center of the hole row among the plurality of positioning holes 64, 64a, the fertilization depth by the fertilizer application nozzles 31, 32 is located at the center E of the adjustable ranges W1, W2. A plurality of positioning holes 64, 64a are set to have a depth. Then, the third fertilizer nozzle 33 is connected to the plurality of positioning holes 7
When fixed by the normal positioning holes 74a of the 4, 74a, a plurality of positionings are made such that the fertilization depth by the third fertilization nozzle 33 is the fertilization depth located at the center E of the adjustable range W3 thereof. The holes 74 and 74a are set. Further, as shown in FIG. 10, the float support cylinder 25 is pivotally adjusted to adjust the float support arms 29a, 2a.
9b is swingably adjusted around the axis Q of the float support cylinder 25 with respect to the planting machine body to adjust the leveling floats 14a to 14a.
By changing the mounting height of c with respect to the planting machine body, the seedling planting depth by each of the seedling planting mechanisms 11a to 11c is set to the depth located in the center F of the adjustable range H of the first fertilizer application. Nozzle 31, second fertilizing nozzle 3
2. When the fertilization depth of the third fertilization nozzle 33 is set to the central depth E, the positioning holes 64, 64a, 7 are arranged so that the fertilization depths of the respective fertilization nozzles 31 to 33 become the same depth.
4,74a is set.

That is, normally, the third fertilizer application nozzle 33
Is fixed by the normal positioning hole 74a and fertilization work is performed. Then, even if the planting depth by the seedling planting mechanisms 11a to 11c is changed, the first and second fertilizer application nozzles 3
If the fertilization depth by 1, 32 is adjusted in an appropriate amount in an appropriate direction, the first and second fertilization nozzles 31, 32 can be adjusted without changing the fertilization depth by the third fertilization nozzle 33.
The vertical distance between the fertilizer discharge ports 31b and 32b and the planted seedlings is equal to the vertical distance between the fertilizer discharge ports 33b of the third fertilizer nozzle 33 and the planted seedlings. That is, fertilization work can be performed while making the fertilization depths of the respective fertilization nozzles 31 to 33 the same.

As shown in FIG. 10, each fertilizer application nozzle 31-31.
In the state where the fertilization depth by 33 is adjusted to the same, the forward rising inclination angle K3 of the third fertilizing nozzle 33 is the same as the forward rising inclination angle K1 of the first fertilizing nozzle 31 and the second fertilizing nozzle 3.
The fertilizer application nozzles 31 to 33 are formed so as to be smaller than the front rising inclination angle K2. That is, the first and second fertilizer application nozzles 31, 32 are in a state in which contaminants such as straw debris easily flow around the side soil preparation floats 14a, 14b, bypassing the fertilizer application nozzles 31, 32,
The third fertilizer nozzle 33 is provided with side leveling floats 14a, 1
It is located between 4b and the center ground leveling float 14c, and is in a state where foreign matters are likely to hit. That is, the first and second
Although a shorter nozzle than the third fertilizer application nozzle 33 is adopted as the fertilizer application nozzles 31 and 32, the fertilizer application nozzles 31 to 31 are used.
While the fertilization locations for the planted seedlings by No. 3 are the same in the machine front-back direction, the first and second fertilization nozzles 31, 32 are guarded by the side leveling floats 14a, 14b, and the third fertilization nozzle 33 is provided with a small front thereof. Depending on the rising inclination angle, it is possible to work while keeping foreign substances from getting caught easily.

[Another Embodiment] FIG. 11 shows the third fertilizer application nozzle 33 attached to the planting machine by another attachment structure. That is, the stay 70 fixed to the main frame 16 of the planting machine body is made to support the nozzle mounting bracket 71 extending from the front side of the planting machine body, and the end to which the fertilizer application hose 33a on the base end side of the fertilizer application nozzle 33 is connected. The part is fixed to the bracket 71. That is, the fertilizer is attached in a state where the fertilization depth cannot be adjusted.

In the state where the depth of planting by the first to third seedling planting mechanisms 11a to 11c is set to the depth located at the center F of the adjustable range H, the fertilization depths by the third fertilizer application nozzle 33 are set to the first and the third. The fertilizer discharge port 33b of the third fertilizer nozzle 33 has a fertilizer depth equal to the center E of the adjustable range F1, W2 of the fertilizer depth by the second fertilizer nozzles 31, 32.
Has been set. Thereby, the seedling planting mechanism 11a-
Even if the planting depth by 11c is changed, the first and second
If the fertilization depth by the fertilizer application nozzles 31, 32 is adjusted in an appropriate direction by an appropriate amount, the first and second fertilizer application nozzles 31,
The vertical distance between the fertilizer discharge ports 31b and 32b of 32 and the planted seedlings of the third fertilizer nozzle 33 becomes equal to the vertical distance between the fertilizer discharge ports 31b and 32b of the fertilizer discharge nozzles 31 to 3 of the third fertilizer nozzle 33.
Fertilization work can be performed with the same fertilization depth according to 3.

The present invention can also be applied to a fertilizer application apparatus which uses a fertilizer in which granular fertilizer is mixed with a fluid gel made of a superabsorbent polymer which has absorbed water, instead of the paste fertilizer.

[Brief description of drawings]

[Figure 1] Side view of the entire riding rice transplanter with fertilizer application

FIG. 2 is a plan view of the seedling planting device in a working state.

FIG. 3 is a plan view of the seedling planting device in a folded and stored state.

FIG. 4 is a plan view of the fertilizer applicator when the seedling planting device is in a working state.

FIG. 5 is a plan view of the fertilizer application device when the seedling planting device is folded and stored.

FIG. 6 is an explanatory diagram of a rolling control mechanism.

[Figure 7] Rear view of the fertilizer applicator

FIG. 8 is a side view of a mounting structure for the first and second fertilizer application nozzles.

FIG. 9 is a side view of a mounting structure for a third fertilizer application nozzle.

FIG. 10 is a side view of the third fertilizer application nozzle in a working mounting state.

FIG. 11 is a side view of a third fertilizer application nozzle mounting structure according to another embodiment.

[Explanation of symbols]

10 Seedling planting device 10a First split seedling planting device portion 10b Second split seedling planting device portion 11a First seedling planting mechanism 11b Second seedling planting mechanism 11c Third seedling planting mechanism 14a First side ground leveling float 14b Second side leveling float 14c Center leveling float 16 Planting machine 31 First fertilizing nozzle 32 Second fertilizing nozzle 33 Third fertilizing nozzle K1, K2, K3 Forward rising inclination angle H Planting depth adjustable range W1, W2 First, Fertilization depth adjustable range of the second fertilization nozzle

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Zensei Nakagawa 64, Ishizukita-cho, Sakai City, Osaka Prefecture Kubota Sakai Factory (72) Inventor Tetsuya Matsumura 64, Ishizukita-machi, Sakai City, Osaka Kubota Sakai Manufacturing Co., Ltd. In-house (56) Reference Japanese Unexamined Patent Publication No. 8-266110 (JP, A) Japanese Unexamined Patent Publication No. 8-331949 (JP, A) Japanese Unexamined Patent Publication No. 2-111222 (JP, A) Actual Development No. 3-129014 (JP, U) Actual Kaihei 1-84524 (JP, U) Actual Kaihei 5-13126 (JP, U) (58) Fields surveyed (Int.Cl. ⁷ , DB name) A01C 11/00 302 A01C 11/02 342 A01C 23 / 02

Claims (4)

(57) [Claims] 1. A first seedling planting mechanism performs seedling planting on a ground leveling location by one first side ground leveling float of a pair of left and right side ground leveling floats, and a second land leveling location by a second side ground leveling float on the other side. depending on the seedling planting mechanism
Performed seedling planting, fertilization rice transplanters which are connected a seedling planting apparatus which performs seedlings planted in the traveling machine body by a third seedling planting mechanism terrain locations by center ground leveling float located between said pair of side leveling float A device structure, wherein a first fertilizer application nozzle for burying fertilizer in a field on the side of the seedling planting position by the first seedling planting mechanism is attached to a first side leveling float, and the second seedling planting mechanism is used. A third fertilizing nozzle for burying fertilizer in the field on the side side of the location, by attaching a second fertilizing nozzle to the second side leveling float , and burying fertilizer in the field on the side of the seedling planting location by the third seedling planting mechanism. The fertilizer application structure of the rice transplanter in which is attached to the body of the seedling planting device. 2. The fertilizer application structure of a rice transplanter according to claim 1, wherein a forward rising inclination angle of the third fertilizing nozzle is smaller than a forward rising inclination angle of the first fertilizing nozzle and the second fertilizing nozzle. 3. The fertilization depth of the first and second fertilization nozzles when the fertilization depth of the third fertilization nozzle is in a state where the planting depths of the first to third seedling planting mechanisms are in the center of the adjustable range. The fertilizer application structure of a rice transplanter according to claim 1 or 2, wherein the fertilizer application depth by the third fertilizer application nozzle is set so that the fertilizer application depth is equal to the center of the adjustable depth range. 4. The pair of left and right third seedling planting mechanisms and third fertilizer application nozzles is provided in the seedling planting device, and the seedling planting device is provided in one of the pair of third seedling planting mechanisms. Third seedling planting mechanism, third of one of the pair of third fertilizer application nozzles
A first divided seedling planting device portion including each of the fertilizer application nozzle, the first side ground leveling float, and the first seedling planting mechanism, and the other third seedling planting of the pair of third seedling planting mechanisms. Mechanism, the other third of the pair of third fertilizer application nozzles
It is divided into a second split seedling planting device portion including each of the fertilizer application nozzle, the second side leveling float, and the second seedling planting mechanism, and both split seedling planting device portions are in a lateral orientation along the lateral direction of the traveling machine body. Connected to the traveling machine body in a working state, in a front-back posture along the longitudinal direction of the traveling machine body, and in a state in which the center leveling float is located on the rear side of the traveling side body with respect to the second side leveling float. The fertilizer application structure of the rice transplanter according to any one of claims 1 to 3, wherein the fertilizer application structure is configured to be switchable between a folded storage state and a closed storage state.