JPS5929553B2 - solid fertilizer for trees - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a solid fertilizer, particularly a solid fertilizer suitable for use on trees.

Fertilization to trees is usually most important from the viewpoint of tree growth for about 3 to 5 years after the seedlings are planted.

Conventionally, chemical fertilizers or single substances such as urea are applied when planting seedlings, but even if these fertilizers are slow-release, they are
Fertilizer effect disappears after about a year.

For this reason, even after planting, it is necessary to fertilize once a year for about five years.

This additional fertilization work requires an extremely large amount of labor as it involves fertilizing each tree in a wide range of areas, such as within greening land and afforestation land.

Therefore, at least during the period when seedlings are actively growing after planting (3
If there is a fertilizer that has a long-lasting effect (about 5 years), there is no need for additional fertilization by simply applying the required amount of fertilizer to the planting hole etc. when planting.

However, no conventional fertilizer has been found that exhibits such long-term fertilizing effect.

One possible way to extend the effectiveness of fertilizer is to obtain large granular fertilizers by compression molding slow-release fertilizers. Its shape retention in water is poorer than it appears, and its long-lasting effect is not sufficient as a tree fertilizer.

Furthermore, molding itself is extremely difficult due to the moldability of fertilizers, and the molding yield is low, making it impractical.

The present inventors have conducted various studies to obtain a solid fertilizer that has improved the above-mentioned drawbacks, and found that by adding mineral heavy oil to isobutylidene diurea powder and compression molding, the fertilizer can last for 3 to 5 years. I learned that a solid fertilizer with fertilizing effect could be obtained and proposed it earlier (Japanese Patent Application Laid-open No. 134867/1983).

This solid fertilizer had a problem in terms of its fertilizing effect, but also had good moldability due to the combined use of mineral heavy oil, and the resulting product had a good appearance.

However, if a shock such as a fall is applied, 1 to 2 out of 10
Individual breakage may occur, which caused some problems during actual handling such as transportation.

In order to improve these shortcomings, the present inventors conducted further studies and found that compression molding using a specific compound and mineral heavy oil in a specific ratio is extremely resistant to impacts such as drops. The present invention was completed after learning that solid fertilizer could be obtained.

That is, the gist of the present invention is to add 1 to 5% by weight of mineral heavy oil and 0% as a rubber component to imbutylidene diurea powder.
．． The solid fertilizer for trees is made by adding 2 to 2.0% by weight of rubber latex and compression molding.

To explain the present invention in detail, isobutylidene diurea used as a fertilizer component in the present invention is a compound obtained by a condensation reaction between 2 moles of urea and 1 mole of isobutyraldehyde, and is usually a slow-release fertilizer. For example, granules of imbutylidene diurea fertilizers are commercially available.

Further, in addition to isobutylidene diurea, fertilizer components such as poorly water-soluble or strictly soluble calcined phosphorous fertilizer, melted phosphorous fertilizer, phosphate rock, and slow-release potassium phosphate fertilizer may be blended as appropriate.

The powdered form of these fertilizers usually has a moisture content of 1 to 15% by weight.
It is preferable to adjust the amount to about 3 to 10% by weight, since compression molding becomes good.

On the other hand, as the mineral heavy oil, so-called lubricating oil is suitable, but heavy oil similar to lubricating oil, such as heavy fuel oil, etc. can also be used.

Specific examples of these include spindle oil, dynamo oil,
Turbine oil, machine oil, mobile oil, liquid paraffin, C
Examples include heavy oil and Minas heavy oil.

Further, two or more of these mineral heavy oils may be used in combination.

If the amount of mineral heavy oil added is too small, the molding yield will be low (furthermore, the shape retention in water will be less than 1 year, making it impossible to obtain sufficient fertilizer effect sustainability, and if the amount is too large, the fertilizer effect in the fertilizer will be low) Usually, it is 1 to 5% by weight based on the powder or granule, as it will reduce the components.
Preferably it is selected from the range of 2 to 3% by weight.

On the other hand, as the rubber latex used in combination with mineral heavy oil in the present invention, styrene-butadiene rubber latex (SB
R), nitrile-butadiene rubber latex (NBR
), chloroprene rubber latex (CR), polyacrylic acid ester latex, styrene-butadiene resin latex, and other synthetic rubber latexes and natural rubber latexes, among which styrene-butadiene rubber latex is preferred.

The amount of these rubber latexes added is effective for powder and granules, and is 0.2 to 2.0% by weight as a rubber component, preferably 0.5 to 2.0% by weight.
It is 1.5% by weight.

If the amount added is too small, sufficient strength improvement cannot be expected, and if it is too large, there will be no significant improvement in the effect, which is not economical.

Further, in the present invention, an appropriate third component additive such as polyvinyl alcohol, petroleum resin, coumaron resin, etc. may be used in combination.

A predetermined amount of both mineral heavy oil and rubber latex are blended into the powder or granule as described above.The method for doing this is to add both to the powder or granule at the same time, or to blend the mineral heavy oil and rubber into the powder or granule. Any method may be used in which the components are added out of order with the latex.

Alternatively, the mineral heavy oil may be added to the mold part during molding.

The capacity of the molded product is usually 5 to 100 c4 in consideration of sustainability of fertilizer effect and moldability.

Further, the hardness of the molded product varies depending on the shape and volume of the molded product, but if it is too small, the shape retention will be poor and a sufficient sustained effect of fertilizer cannot be obtained, and the hardness will be powdered or crushed during handling.

Therefore, when molding is performed using a briquette machine, the gap between the rolls, the feed rate of raw materials, etc. are appropriately adjusted, and the molding pressure is such that the hardness of the molded product is at least 2 kg/crA or more.

According to the present invention, a product having extremely high strength can be obtained without cracking the surface of the solid fertilizer.

Therefore, there is no fear that the solid fertilizer will break during handling such as transportation, and the fertilization time will be longer.

Moreover, of course, when the solid fertilizer of the present invention is applied to trees, the fertilizing effect can be maintained for 3 to 5 years.

Next, the present invention will be explained in more detail with reference to Examples.

Examples 1 to 4 and Comparative Example 1 Isobutylidene diurea powder (moisture content 6%, particle size 0.
7~2.0'X) (manufactured by Mitsubishi Kasei Kom, product name IBDU)
3 kg of Minas heavy oil heated to 70℃ in 1o Oky
Tostyrene-butadiene rubber latex (Rubber latex A1712 latex manufactured by Mitsubishi Chemical Industries, Ltd.) was mixed in the proportions shown in Table 1, and then compression molded in an almond-shaped briquette machine (mold volume: 34 x 34 x 20 ~).

In addition, during compression molding, liquid paraffin 2 and 9 were sprayed onto the mold part of the briquette machine.

The solid fertilizers obtained as described above were measured for product hardness, falling strength, and yield, and the results shown in Table 1 were obtained.

Examples 5 and 6 and Comparative Example 2 Compression molding was carried out in the same manner as in Example 1, except that the amount of Minas heavy oil and the addition ratio of styrene-butadiene rubber latex were changed as shown in Table 2.

Table 2 shows the results of measuring the physical properties of the obtained solid fertilizer.

Reference Example The solid fertilizers obtained in Examples 1 to 4 and Comparative Example 1 were measured for their underwater hardness, underwater shape retention, and duration of fertilizer effect, and the results shown in Table 3 were obtained.

From the results in the above table, it can be seen that the solid fertilizer to which the rubber latex of the present invention is added has the same level of fertilizing effect as the solid fertilizer containing only mineral heavy oil (Comparative Example 1).

The test method carried out in the present invention is as follows.

(1) Pack the fall strength products 15 into 9 bags and place them on the concrete floor at a height of 1.
．． The weight ratio of the crushed material to the product when it is allowed to fall naturally from 5 m twice.

(2) Product hardness Compressive fracture pressure was measured using a Honya type fracture hardness tester.

(3) Molding yield The weight ratio of the complete molded product to the total amount of powder and granules supplied to the molding machine.

(4) Underwater hardness After leaving 5 samples in a beaker containing 500 ml of water at room temperature for 24 hours, the samples were taken out and the compressive fracture pressure was measured using a Honya type hardness tester.

(5) Shape retention in water Place one sample in a water tank where tap water is flowing at a rate of 5A/hr.
Leave it for a year and visually observe the shape retention from the outside.

Claims (1)

[Claims] 1 Inbutylidene diurea powder and mineral heavy oil 1~
A solid fertilizer for trees that is compression-molded by adding 5% by weight and 0.2 to 2.0% by weight of rubber latex as a rubber component.