JP6178458B2 - Herbicidal material and herbicidal construction method using the herbicidal material - Google Patents

Description

  The present invention relates to a herbicidal material for preventing the generation of weeds on the ground of a planting place such as a park, a factory site, and a road median strip, and a herbicidal construction method using the herbicidal material.

In order to prevent weeds from growing on the ground such as green spaces in parks, conventionally, a method of covering the soil surface with gravel is performed, and a method of covering with a piece of tree as in Patent Document 1 below, or Patent Document 2 below. A countermeasure against weeds by covering the soil surface with a method such as covering with a sheet has been proposed.
Patent Document 3 below also proposes a slope covering material that prevents the generation of weeds using molten slag, soil, cement, sand, or the like.
In addition, in the following Patent Document 4 of the invention by the present inventor, a technique for covering aggregate with asphalt is disclosed although it is used for road pavement and is used for different purposes.

JP-A-9-252664 Japanese Patent Laid-Open No. 10-94336 Utility Model Registration No. 315592 JP-A-9-316808

In the above-mentioned method of covering the soil with gravel, it is difficult to grow grass by increasing the thickness of the gravel laying layer (for example, a layer thickness of 30 cm or more) in order to enhance the herbicidal effect, but on the other hand, the soil around the plant is excessive. As a result of increased drainage, the soil at the root of the plant becomes too dry, which adversely affects the plant, and conversely, if the layer of gravel is thinned (for example, thinned to about 3 cm), seeds of weeds are formed under the layer. Will not be able to prevent germination and growth.
In addition, when the ground is covered with a piece of tree as in the above-mentioned Patent Document 1, the thickness of the laying layer is likely to be uneven due to floating by a water pool, blowing by wind and rain, sweeping at the time of cleaning, etc. As a result, there is a possibility that a place where weeds are likely to be generated is created.
In addition, when a sheet such as the above-mentioned Patent Document 2 is coated, the natural scenery of the green space is greatly damaged, the sheet material itself made of synthetic resin is damaged by ultraviolet rays or the like, or it is drowned by a strong wind. Damages such as tearing due to flying objects may occur, and weeds may be generated in the damaged part. Furthermore, once the sheet is damaged, it is necessary to repair the damaged portion, which makes management difficult.
Moreover, since the above-mentioned patent document 3 does not cause a great sense of incongruity with the soil surface of the planting place because the appearance is close to soil, the slope covering material is mainly intended to prevent the soil from being washed away. Since aggregate particles are strongly bonded and hardened by cement, it is necessary to destroy the covering surface of the planting part when planting or transplanting a new tree or the like. And since the covering surface is hard, there is a problem that it is difficult to replant the plant by changing the design of the tree or the like.
In addition, the invention of the above-mentioned Patent Document 4 merely takes into account that the oily asphalt component contained has a repellent effect on plants, and the asphalt component enables prevention of the growth of weeds. However, this is not an attempt to prevent the weeds from growing by paying attention to the relationship between the voids between the particles and the water repellency of the particle surface, which will be described later.

  The present inventor has conducted extensive research on the above problems, and has made the present invention by paying attention to the water repellency and viscosity characteristics of asphalt. It is possible to prevent weeds from growing on the ground, and to ensure the supply of moisture by rainwater necessary for the growth of plants, to achieve both healthy growth of plants and natural scenery of greenery, and laying work during construction It is an object of the present invention to provide a granular herbicidal material that has appropriate fluidity and can be easily maintained after construction, and a herbicidal construction method that uses the herbicidal material.

  In order to achieve the above object, according to the invention of claim 1, the herbicidal material of the present invention is intended for crushed crushed stones of No. 6 to No. 7 and covers the entire periphery of the crushed stone particles. The asphalt layer having a total weight ratio of 1 to 3 wt% is formed.

  In invention of Claim 2, it is the grass prevention construction method using the grass protection material of the said Claim 1, Comprising: The sheet | seat which has water permeability is laid on soil, The said sheet | seat is carried out on this sheet | seat. It is characterized by laying the herbicidal material in a layer thickness so that weed seeds do not germinate.

The present invention configured as described above has the following effects.
In the invention of the herbicidal material according to claim 1, the crushed stone particles of No. 6 to No. 7 baked by the herbicidal material have asphalt water repellency with a total weight ratio of 1 to 3 wt%. Covered with layers.
When this herbicidal material is laid on the ground, voids are formed between the particles and surrounded by an asphalt surface and communicated vertically and horizontally. Since the voids have a water-repellent surface and the entire surrounding surface is formed, water does not remain inside the laying layer for a long time, but quickly passes under the laying layer while being repelled by the water-repellent surface of the asphalt. Go.
Also, some residual water adhering to the particles in the layer cannot penetrate into the particles of crushed stone coated with water-repellent asphalt, so it becomes a small polka dot and is held on the surface of the asphalt layer. Disappears in a short time by evaporating into the air from the air passage ventilated to the outside.
On the other hand, on the lower surface of the laying layer of the herbicidal material, the moisture in the soil is prevented from rising due to the water repellent surface of the asphalt, and as a result, the crushed stone particles cannot rise. Water in the soil is not absorbed.

  When seeds of weeds fly on the laying of the herbicidal material, the seeds are caught by the viscosity of asphalt and cannot penetrate deep inside the layer of the herbicidal material, and the surface of the laying layer The seed on the surface of this laying layer stays in the vicinity, so it is difficult to germinate because sufficient moisture cannot be obtained, and even if it can germinate temporarily in rain water, the plant cannot grow and cannot grow. It will eventually wither.

Further, the total weight ratio of asphalt is 1 to 3 wt%, which is very small as compared with that for general paving, and the thickness of the coating layer of the herbicidal material formed by that amount becomes a very thin film.
For this reason, when the herbicidal material is laid on the ground, a wide gap is formed between the particles so that the gap can be smoothly passed up and down without being clogged with almost asphalt material.
And when water is flowed over it, a small amount of water is repelled on the water-repellent surface of asphalt and partly remains by adhering to the particle surface, but most of it remains from the rainwater permeation channel formed in the gap. It quickly falls to the bottom of the laying layer under its own weight.
That is, most of the rainwater that has fallen on the laying layer of the herbicidal material is quickly sucked into the soil of planting in the lower layer, and natural water is supplied to the trees and flowers.

  Furthermore, since the surface of the crushed stone particles is entirely covered with a water-repellent asphalt layer, moisture cannot enter the crushed stone itself, and the surface of the particles of the herbicidal material is temporarily attached to the surface of the herbicide material by rainwater or the like. Even inside, the crushed stone is not wet at all, the dry surface of the crushed stone is maintained, the water-repellent asphalt is prevented from peeling off the surface, and the entire surface of the crushed stone particles is stably covered with asphalt for a long period of time. State is maintained.

Also, when the herbicidal material is laid on the ground, the herbicidal materials gather together and come into contact with each other on the asphalt surface, and at that time, the asphalt layer is solidified so that the particles do not stick to each other. . For this reason, the “leveling work” for flattening the surface of the herbicidal material, and the “working work” for moving from a place where a large amount of the herbicidal material is concentrated to a small place are in a state of smoothness. Therefore, it is possible to easily perform the work without receiving a mass of resistance that hinders the work.
On the other hand, after the laying, the movement of particles is suppressed by the viscosity of the asphalt, and the state at the time of laying the layer is maintained for a long time. That is, it is possible to suppress the movement and outflow of particles due to wind and rain, and to prevent the weed seeds trapped in the laying surface layer from moving to the soil side, and to effectively suppress germination and growth of weeds.
That is, the “smooth state” in the present invention means that a large amount of asphalt does not stick to each other at room temperature to form a lump, and each other moves to the extent that a leveling operation such as reiki is possible. This is a possible state, but on the other hand, it retains the inherent viscosity of asphalt and is blown away by the wind after laying, or it can be prevented from flowing out due to rain.

  Also, even if the raw crushed stone itself is grayish white or other stone color, the herbicidal material becomes black with an asphalt coating and looks like black soil in the culture soil, giving it unnaturalness as planting soil There is nothing.

In the invention of claim 2, by laying a sheet having water permeability on the soil, the particles enter the soil and stably maintain the flatness of the soil upper surface and the uniformity of the laying layer. Thus, it is possible to prevent a thin layer from being partially formed on the upper surface of the soil and to allow rainwater to quickly pass through the soil and prevent water from being retained in the herbicidal material layer.
In construction, the above-mentioned herbicidal material is spread on the sheet without pressing to a certain layer thickness, and the wide gap having high water permeability in the laying layer without breaking the gap formed between the particles. Can be maintained for a long time.

It is a conceptual diagram which shows the relationship between the raw material of a herbicidal material, and the manufactured herbicidal material. It is a typical vertical side view which shows the state which laid the herbicidal material. In the manufacturing process of the herbicidal material of the present invention, (a) is a schematic view showing a firing step, (b) is a mixing step, and (c) is a cooling step. It is a typical vertical side view which shows the state which laid the herbicidal material in the planting side connected to a curb. It is a flowchart which shows the manufacturing method of the herbicidal material of this invention. It is a flowchart which shows the grass prevention construction method using the grass protection material of this invention. It is a flowchart which shows the grass prevention construction method using the grass protection material of another this invention. It is sectional drawing which shows the condition of sowing in the construction test of this invention. It is a photograph which shows the condition of the construction test.

Embodiments of the present invention will be described below.
The herbicidal material 1 of the present invention is obtained by coating crushed particles with an asphalt layer, and as shown in FIG. An asphalt layer having a total weight ratio of 1 to 3 wt% was formed by covering the entire periphery.
As shown in FIG. 2, the herbicidal material 1 is used by laying a constant layer thickness H on the surface of soil 5.

The raw crushed stone 2 is a crushed stone 2 obtained by crushing igneous rocks and sedimentary rocks, etc., and uses a general standard “crushed stone” used for cement as a construction material, but is itself water-repellent. There is no.
Regarding “crushed stone”, the Japanese Industrial Standards Institute defines the size according to the following JIS standards.

Particle size of crushed stone (JIS A 5001)
Name S-13 (No. 6)
Sieve opening, particle size range 13-5mm
Percentage of mass passing through the sieve
Sieve opening 19mm 100%
13.2mm 85-100%
4.75mm 0-15%
Name S-5 (No. 7)
Sieve opening, particle size range 5-2.5mm
Percentage of mass passing through the sieve
Sieve opening 13.2mm 100%
4.75mm 85-100%
2.36mm 0-25%
1.18mm 0-5%

  In the present invention, the included particles use “crushed stone” of the above-mentioned standard in which particles having different sizes are combined. Among the above-mentioned standards, S-13 (referred to as No. 6), S-5 (referred to as No. 7). Either crushed stone 2 or a mixture thereof is used.

The asphalt is a semi-solid or solid adhesive substance whose main component is bitumen (a hydrocarbon compound soluble in carbon disulfide) as a natural or petroleum residue.
In particular, the asphalt used as a raw material in the present invention is optimal in that straight asphalt containing almost no components other than asphalt has a constant performance.
For example, the product name “60-80 straight asphalt” of Cosmo Oil Co., Ltd. can be used.
The physical properties of the straight asphalt product are as follows.

Needle penetration (25 ° C): 69
Softening point: 49.5 ° C
Elongation (15 ° C): 100+
Density (15 ° C.) g / cm ³ : 1.034
Kinematic viscosity 120 ° C: 931
Same as above 150 ° C: 212
Same as above 180 ° C: 71.3

As described above, straight asphalt is sticky, becomes solid at room temperature, and softens at 49.5 ° C.
The kinematic viscosity is 931 at 120 ° C. and 71.3 at 180 ° C., and the fluidity tends to increase as the temperature increases.

In the present invention, the asphalt 3 is used in a blending amount of 1 to 3 wt% in total weight. However, if the amount is less than 1 wt%, the crushed stone 2 may not be sufficiently covered with the particles and is not covered. If there is a portion, water may penetrate into the crushed stone particles 2 from the portion, which is not preferable. Further, the obtained particles are not preferable because the viscosity is too poor on the surface, and when the particles are laid on the ground, the bonding property between the particles is weakened, so that the laying layer tends to collapse.
On the contrary, if the amount exceeds 3 wt%, the feeling of smoothness between the particles is lost, and it becomes difficult to perform the leveling work with stickiness.
That is, the limit of the minimum blending amount of the asphalt 3 is the minimum amount that can cover all of the particles, and the limit of the maximum blending amount is an amount determined by the difficulty of leveling work.

When the total weight ratio of the asphalt 3 is used in the range of 1 to 3 wt%, as shown in FIG. 2, the obtained herbicidal material 1 is germinated on the soil 5, and the seeds of weeds are germinated on the herbicidal material 1. When the layer thickness H is not set, the asphalt 3 on the particle surface of the crushed stone 2 has a smooth feeling due to the viscosity of the asphalt 3, and in the distribution work during transportation from the manufacturing factory to the laying site or the leveling work at the laying site, The herbicidal material 1 can be easily beaten or moved with a small amount of resistance with a scoop or the like.
Moreover, after laying on the surface of the soil 5, the movement of the particles by wind and rain is suppressed, and the thickness of the layer once laid can be maintained for a long time.
Considering the stability of the particles after laying and the ease of laying work, the total weight ratio of the straight asphalt is optimally 2.0 wt%.

The crushed stone 2 used by this invention uses the said 6th-7th thing.
Small particles below the standard that do not fall under No. 7 cannot obtain sufficiently large voids between the particles, and when such small particles are spread, water is repelled by the water repellent particles by the asphalt on the surface, so water has a surface tension. It is not preferable because it gathers round and cannot pass through the gap smoothly.
In addition, only large particles of crushed stone such as those used for railway ballasts can produce large voids between the particles, but on the other hand, weed seeds pass through the large voids and fall below the laying layer. This is not preferable because the seeds will germinate and grow with the moisture and nutrients of the soil.
In addition, since the said crushed stone 2 is a natural thing, the particle | grains which rubbed during conveyance may be mixed, but if it is a small amount, it will not become trouble.

Next, the manufacturing method of the herbicidal material 1 of this invention is demonstrated.
As shown in FIGS. 3 and 5, the manufacture of the herbicidal material 1 of the present invention proceeds in the order of the firing process, the mixing process, and the cooling process.

In the firing step, the crushed stone 2 is fired in a firing furnace 10 as shown in FIG.
The firing temperature in the furnace is set to 100 ° C. or higher in order to evaporate and remove moisture, and in this step, the particles of the crushed stone 2 become dry.
Further, for example, if the temperature in the firing furnace 10 is adjusted to 160 to 180 ° C., not only the surface of the particles of the crushed crushed stone 2 is dehydrated but also adheres to the particles of the crushed stone 2. Organic matter such as weed seeds and nutrients necessary for plant growth are incinerated.

In the next mixing step, as shown in FIG. 3 (b), the baked and dried crushed stone 2 having a particle size of No. 6 to No. 7 and a straight having a total weight ratio of 1 to 3 wt% dissolved. The asphalt 3 is put into the stirrer 9 and stirred and mixed in the stirrer 9 until the surface of the particles of the crushed stone 2 is covered with the layer of asphalt 3.
If the temperature in the stirrer at this time is 180 ° C. in order to increase the fluidity of the asphalt, the kinematic viscosity of the straight asphalt at this time is 71.3, and the total weight ratio is 1 to 3 wt. %, The asphalt 3 is thinly and uniformly coated on the entire surface of the crushed stone 2 particles that are not inherently water-repellent, resulting in particles having water repellency on the surface.
In the cooling step, the crushed stone 2 covered with the layer of asphalt 3 is transferred from the stirrer 9 into the container and cooled by placing it at room temperature as shown in FIG. The asphalt 3 layer is solidified.

As shown in FIGS. 1 and 2, the granular herbicidal material 1 obtained in the manufacturing process is uniformly covered with a thin layer of asphalt 3 on the entire surface of the crushed stone 2, and the entire surface is repellent. It becomes water surface and the whole becomes glossy black.
The raw material asphalt 3 can be easily colored in an arbitrary color such as green or brown by adding a pigment.

When the herbicidal material 1 is laid on the surface of the soil 5 between the plantings, as shown in FIG. 2, the void S formed between the particles whose surfaces are covered with the layer of asphalt 3 communicates vertically and horizontally. The rainwater permeation channel 6 formed in the upper and lower direction is formed.
When water is made to flow over the upper surface of the layer, the water is bounced by the water repellent surface of the asphalt 3 and does not stay and passes straight through the rainwater permeation path 6 formed in the gap S.
When weed seeds 7 fly to this surface, as shown in FIG. 2, even if it falls to the surface, it enters the void S of the water-repellent surface surrounded by the asphalt 3 layer in the surface layer together with dirt, and the void width is It is small and the asphalt surface is trapped by the viscosity of the seed and does not fall into the soil below it.
For this reason, rainwater flows down smoothly from the rainwater permeation channel 6, and the moisture of the rainwater is hardly supplied to the weed seeds 7.
On the other hand, under the laying layer, moisture from the soil 5 cannot be repelled and raised by the water repellent surface of the asphalt 3 layer, and nutrients contained in the water do not enter the laying layer. The growth conditions of water and nutrients are not retained in the laying layer.
As a result, weeds will no longer grow on the surface of the soil, and even if they grow, they will die soon.

Next, the soil-proofing method of the soil surface using the herbicidal material 1 of this invention is demonstrated.
The construction target place is not a passage that is stepped down by a person, but the five soil surfaces such as parks, open spaces in green spaces, and road planting zones.
As shown in the herbicidal construction method (1) in FIG. 6, the construction includes a sheet laying step of laying a sheet 4 having water permeability on the surface of the soil 5, and a prevention of laying the herbicidal material 1 on the sheet 4. This is done in the grass laying process.
At the construction site, first, as shown in FIG. 2, the sheet 4 is laid on the soil 5 that has been leveled so that the surface is flat.
The water-permeable sheet 4 used in the present invention is a sheet 4 capable of promptly allowing rainwater to pass through, such as a synthetic resin cloth, a nonwoven fabric, a synthetic resin mesh sheet, and the like. Sheets that are wet and easily torn like paper are not targeted because the flatness of the surface may be impaired.
On the sheet 4, the herbicidal material 1 is laid flat with a layer thickness H at which the weed seeds 7 do not germinate. At that time, by crushing without applying pressure from above, crushing of the voids is prevented, and a wide void between the particles is secured.

  In the construction work, that is, the “transportation movement work” and “laying and leveling work” of the herbicidal material 1, since the herbicidal material 1 is in a smooth state, a large resistance that hinders the work is obtained. The work can be easily performed without receiving it.

The sheet 4 is laid down to maintain and stabilize the flatness of the upper surface of the soil 5. If the sheet 4 is not laid, the particles of the herbicidal material 1 placed on the soil 5 This is because the soil is buried in soft soil, and the flatness is lost, and a partial thin layer may be formed on the layer of the herbicidal material 1.
The layer thickness of the herbicide 1 to be laid is a layer thickness H at which the weed seeds 7 do not germinate.
The particle size range of the opening of the crushed stone 2 particles is 13 to 5 mm for No. 6, 5 to 2.5 mm for No. 7, and is in the range of 13 mm to 2.5 mm. It is possible to select the optimum laying layer thickness depending on the type of the material. A suitable laying layer thickness is, for example, 30 to 70 mm.

However, if the laying layer is thinned to 13 mm or less in No. 6 and 5 mm or less in No. 7, moisture in the soil evaporates and rises through the sheet 4 even if moisture is not retained in the layer. Due to the influence, moisture is given to the seeds of weeds that have entered the middle of the layer, and the deterrence of seed germination is reduced, and the possibility of germination increases. Also, seeds as small as 1 mm pass through the laying layer, and it is not preferable because the seeds in contact with the sheet surface are likely to germinate by obtaining moisture and nutrients from the soil.
Moreover, even if the layer thickness is 10 cm or 20 cm, construction is possible, so the upper limit of construction is not particularly defined, but if a reliable herbicidal effect is obtained, it is not necessary to increase the thickness further, If a large amount of the herbicidal material 1 is used, the material cost and the cost of construction work increase. Therefore, considering the economy, 50 mm can be set as the optimum standard laying layer thickness.

Moreover, as for the grass prevention construction method of the curb portion facing the road, as shown in the grass prevention construction method (2) of FIG. 7, the construction is a sheet laying in which a sheet 4 having water permeability is laid on the soil 5 surface. Although it is performed by the process and the herbicidal material laying process of laying the herbicidal material 1 on the sheet 4, it is the same as the said herbicidal construction method (1) except for the vicinity of the curb.
Then, the soil 5 at the boundary with the curb stone 10 is dug deeply to about 60 mm, and the sheet 4 is laid on the soil 5 surface of the flat portion thereon, and the weed prevention material 1 is weeded on the sheet 4 of the flat portion. The seed 7 is laid so as not to germinate, and the herbicidal material 1 is filled on the sheet 4 of the dug-down portion 11 at the boundary with the curb stone 10 and the upper surface thereof is laid flush with the flat portion.
As for the layer thickness at which the weed seeds 7 in the flat portion do not germinate, 50 mm is optimal as in the above-mentioned weed prevention construction method (1).
In FIG. 4, reference numeral 12 denotes a road surface pavement layer 12 separated by a curbstone 10.
In this embodiment, even if a part of the surface layer of the herbicidal material 1 laid by rainwater collected on the soil portion at the border with the curbstone 10 is washed away, the thick layer of the herbicidal material 1 causes the seeds of weeds. 7 cannot germinate. This makes it possible to reliably prevent the generation of weeds at the edge of the curb 10 where weeds are likely to grow as well as the flat part.

Next, the Example of the herbicidal material 1 of this invention is shown.
The raw materials used for the production were the following 7 crushed stones as crushed stone 2.
Usually, crushed stone contains about 1% by weight of water.

  Asphalt 3 used was 60-80 straight asphalt manufactured by Cosmo Oil Co., Ltd., and the total weight ratio of the straight asphalt 3 was measured to be 3.0 wt%.

And the herbicidal material 1 was manufactured using the said crushed stone 2 and asphalt 3. FIG.
In manufacturing, as shown in FIG. 5, the firing process, the mixing process, and the cooling process were sequentially performed.
In the manufacturing process shown in FIG. 3, an embodiment in which the firing furnace 10 and the stirrer 9 are used is shown. In this example, a firing stirrer equipped with a burner capable of stirring and firing was used.
And in the baking process, the crushed stone 2 was baked for about 15 minutes in the baking stirrer set to the temperature of 180 degreeC. As a result, the particles of the crushed crushed stone 2 were removed to such an extent that moisture was hardly contained.
In the next mixing step, straight asphalt 3 measured so as to have a total weight ratio of 2.0 wt% with respect to the dried crushed stone 2 while setting the temperature in the baking stirrer to 180 ° C. It put into the said baking stirrer.
Then, the mixture was sufficiently mixed with stirring until the periphery of the crushed stone 2 was covered with the layer of asphalt 3 while maintaining the temperature at 180 ° C. The stirring time was about 7 minutes.
Thereafter, the particles inside were taken out from the baking stirrer.
The particles became black as if the entire surface of the crushed stone 2 was wet with water in the asphalt 3 layer, and it was confirmed that the crushed stone particles were thinly and evenly coated.
In the next cooling step, the particles taken out from the baking stirrer were once transferred to a container and allowed to cool naturally at room temperature.
As a result, the asphalt 3 covering the surface was solidified, and a black granular herbicidal material 1 was obtained.

Next, using the obtained granular herbicidal material 1, it was laid on the soil 5 around the planting of the planting zone of the factory.
At that time, a non-woven fabric made of synthetic fiber with a thickness of 0.3 mm having water permeability is laid first, and the herbicidal material 1 with a layer thickness of 50 mm thereon is not pressurized. Laid down on the floor.
The sheet 4 having water permeability such as the non-woven fabric is laid to flatten the surface of the soil 5 so that the flatness is stably maintained, and moisture and nutrients contained in the soil 5 are blocked by the sheet surface. In order to prevent the layer of the herbicidal material 1 from reaching as much as possible.

  For confirmation, when a large amount of water was sprinkled with a hose from the top of the layer, the water immediately fell down as if it was sucked into the void S, and although a small amount of water droplets remained on the surface, the surface did not collect water and was almost transparent. I went. From this, it was confirmed that there was high water permeability.

Further, weed seeds 7 were collected and sown on the surface of the laying layer of the herbicide 1. The seed 7 was about 2 mm to 1 mm in size.
As shown in FIG. 2, weed seeds 7 stayed in the vicinity of the upper surface opening of the gap S and entered some places where they could not be seen from the surface. There was no seed that had stopped in the middle of the surface layer of the void S and passed through the laying layer to the bottom.
When left undisturbed for several months, weeds grew on the bare soil in the surrounding unexposed areas, but weeds were not seen on the laying surface of the herbicide 1 It was.

The construction test was conducted as follows.
Using single-grain crushed stone 7 for crushed stone and straight asphalt for asphalt, 0.144 m ³ for single-grain crushed stone 7 and 11.25 kg for straight asphalt, respectively, and producing the herbicidal material of the present invention according to the production method shown in the above example did.
On the other hand, horticultural black soil was selected as the cultivated soil, three wooden boxes of 500 × 500 × 210 mm (one per square) arranged in four rows were prepared, and the cultivated soil was laid flat on the bottom. On the soil, the herbicidal material was laid flat with a) 50 mm, b) 30 mm, and c) 0 mm (no treatment).
As the target weeds, bark beetle and kosendangusa were selected and sown in an amount of 2 grams per 1 kg. As for the method of sowing, for bark beetle and Kosendangusa, 1 gram of 2 grams was divided into a front surface and a lower surface, sowing. The outline of the sowing situation is as shown in FIG.
The progress of germination was observed by observing germination every 1-2 months after construction.
The construction day was sown in mid-April 2013, and the growth status was finally confirmed after 136 days.
The results are shown in the table below.

As a result, in the 50 mm thickness of No. 7 crushed stone, it was found in both the mosquito and Kosendangusa, and germination and growth were zero in any of the three types of wooden frames, the left frame, the middle frame, and the right frame. It was confirmed that the construction according to the present invention was extremely effective compared to the fact that 23 soils were found in the moss and 16 germinations and growths were observed in Kosendangusa.
On the other hand, in the No. 7 crushed stone 30 mm thick, germination and growth were not observed in the mosquito but two germination and growth were observed in the middle frame and one in the right frame. However, this is also an average of 6.3% compared to the above-described 23 untreated (only cultivated soil) bark and 16 kosendansa, and the effectiveness of the construction based on the present invention was also confirmed here.
In addition, the photograph in FIG. 9 shows the situation of the construction test result after about 60 days have passed since construction.

  In addition to use in parks, green spaces, etc., the present invention can be widely used on various soil surfaces such as farmland ridges, roadsides, and planted median strips.

DESCRIPTION OF SYMBOLS 1 Herbicidal material 2 Granulated stone of No. 6-7 No. 3 Asphalt 4 Permeable sheet 5 Soil 6 Rainwater permeation channel 7 Weed seeds 8 Firing furnace 9 Stirrer 10 Curb 11 Drilling part 12 Road surface pavement layer S Cavity H Layer thickness of herbicide

Claims (2)

  A herbicidal material characterized in that the asphalt layer having a total weight ratio of 1 to 3 wt% is formed by covering all the surroundings of the crushed stone particles having a particle size of No. 6 to No. 7 as a target. . It is a herbicidal construction method using the herbicidal material of Claim 1, Comprising: The sheet | seat which has water permeability is laid on the soil of a planting place, The said herbicidal material is seeds of weeds on this sheet | seat Weed prevention construction method characterized by laying in a layer thickness that does not germinate.