JP5361202B2 - Granular fertilizer composition and method of use thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fertilizer composition which exhibits the effect of a fertilizer having phosphorus acid and/or the salt at most, and is applied by a necessary quantity at one time without causing adverse effect such as chemical injury. <P>SOLUTION: The fertilizer composition is granular and contains phosphorus acid or the salt. The granular fertilizer composition contains phosphorus acid or the salt, a binder and a solid carrier. The granular fertilizer composition is applied to cultivation soil or cultivation medium before settled plantation, in settling plantation or in top-dressing when being used. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a granular fertilizer composition and a method for using the same.

  Phosphorus, along with nitrogen and potassium, is one of the three major nutrients of fertilizers and is required to be used in large quantities throughout the entire growth stage of the crop. In recent years, it has been reported that phosphorous acid and its salt can be applied as an aqueous solution to a crop to obtain effects such as increased yield and quality improvement of the crop (Patent Document 1). Aqueous solutions are used by farmers as foliar fertilizers.

  However, foliar fertilizer consisting of an aqueous solution of phosphite and its salts cannot be applied in a timely manner due to the influence of weather conditions (rainfall, wind, etc.), or it can be moved to nearby residential areas due to drift (scattering). There is concern about environmental pollution. Also, due to concerns about damage to crops, such as phytotoxicity inherent in phosphites, there are restrictions on the timing of use and the amount of fertilization (concentration), and a certain period of time to obtain the desired fertilizer effect There is a problem in terms of complexity. Furthermore, when spraying phosphite, it is necessary to use a spray solution with a relatively low concentration, so it must be diluted with a large amount of water before use, and a large amount of aqueous solution must be sprayed accordingly. Therefore, there is a problem of load on workers.

  In addition, Patent Document 1 suggests that phosphite is treated in soil, but soil treatment in the form of an aqueous solution tends to be washed away by rainfall because the salt of phosphorous acid is readily soluble. The crops cannot effectively use the salt of phosphorous acid. On the other hand, fertilizing the required amount (high concentration phosphite aqueous solution) at once in consideration of the amount lost and lost will also cause phytotoxicity to the crop (see comparative example below) and solve the above problems I can't.

From the above, it was considered that it was inappropriate for those skilled in the art to use phosphorous acid or a salt thereof in soil.
US Pat. No. 5,514,200

  The present invention is a fertilizer containing phosphorous acid or a salt thereof, exhibiting an excellent fertilizer effect, and capable of fertilizing a necessary amount at once without causing adverse effects such as phytotoxicity The issue is to provide goods.

  This invention makes it a subject to provide the fertilizer composition which can be used as a basic fertilizer or a top fertilizer, and can reduce the burden on an operator by the expression of the fertilizer effect over a long period of time.

The inventors of the present invention have made extensive studies to solve the above problems. As a result, it has been found that by combining the calcium salt of phosphorous acid and phosphorous acid or the potassium salt of phosphorous acid, an excellent fertilizer effect is exhibited. By making these phosphorous acid and / or its salt into a granular fertilizer composition instead of a spread fertilizer, even if the amount of fertilizer applied is increased, no phytotoxicity can be caused, and a long-term fertilizer effect can be realized. I found out that I can reduce it.
It was completed based on these findings.

This invention provides the granular fertilizer composition shown to the following items 1-8, and its usage.
Item 1. (Component A) A granular fertilizer composition containing at least one selected from the group of phosphorous acid, potassium hydrogen phosphite and potassium phosphite and (Component B) a calcium salt of phosphorous acid.
Item 2. Item 2. The granular fertilizer composition according to Item 1, comprising Component A, Component B, a binder, and a solid carrier.
Item 3. Item 3. The granular fertilizer composition according to Item 1 or 2, wherein Component B is calcium hydrogen phosphite or calcium phosphite.
Item 4. Item 3. The granular fertilizer composition according to Item 2, wherein the solid carrier is at least one selected from bentonite, clay, calcium sulfate, and calcium carbonate.
Item 5. Item 5. The granular fertilizer composition according to any one of Items 1 to 4, wherein the blending ratio of Component A and Component B is 0.1 to 10 parts by weight of Component A with respect to 1 part by weight of Component B.
Item 6. A granular fertilizer composition obtained by kneading Component A, Component B, a binder and a solid carrier and extruding and granulating.
Item 7. Item 7. A method for using a granular fertilizer composition, wherein the granular fertilizer composition according to any one of items 1 to 6 is fertilized to a cultivated soil or a medium before or after planting a crop.
Item 8. Item 7. A method of using a granular fertilizer composition, wherein the granular fertilizer composition according to any one of items 1 to 6 is fertilized to cultivated soil or a medium as additional fertilizer during a crop growth process.

The present invention also includes the following aspects.
Item 9. A granular fertilizer composition containing phosphorous acid and a calcium salt of phosphorous acid.
Item 10. A granular fertilizer composition containing potassium hydrogen phosphite and a calcium salt of phosphorous acid.
Item 11. A granular fertilizer composition containing potassium phosphite and a calcium salt of phosphorous acid.
Item 12. A granular fertilizer composition comprising potassium hydrogen phosphite, potassium phosphite and a calcium salt of phosphorous acid.
Item 13. Item 13. The granular fertilizer composition according to Item 9 to 12, wherein the calcium salt of phosphorous acid is calcium phosphite.
Item 14. Item 14. The granular fertilizer composition according to Items 9 to 13, further comprising a binder and a solid carrier.
Item 15. Item 15. The granular fertilizer composition according to Item 2 or 14, wherein the solid carrier is bentonite and calcium carbonate.
Item 16. Item 15. The granular fertilizer composition according to Item 2 or 14, wherein the solid carrier is bentonite and calcium sulfate.
Item 17. Item 15. The granular fertilizer composition according to Item 2 or 14, wherein the binder is pregelatinized starch.

The granular fertilizer composition of the present invention comprises at least one selected from phosphorous acid, potassium hydrogen phosphite (KHPHO ₃ ) and potassium phosphite (K ₂ PHO ₃ ) and a calcium salt of phosphorous acid. (Component B).

The calcium salt of phosphorous acid used in the present invention is calcium hydrogen phosphite (Ca (H ₂ PO ₃ ) ₂ ) or calcium phosphite (CaPHO ₃ ), and calcium phosphite is preferred.

  In the present invention, a calcium salt of phosphorous acid (component B) is an essential component, and it is used in combination with at least one selected from phosphorous acid, potassium hydrogen phosphite, and potassium phosphite (component A). The combinations include phosphorous acid calcium salt and phosphorous acid, phosphorous acid calcium salt and potassium hydrogen phosphite, phosphorous acid calcium salt and potassium phosphite, phosphorous acid calcium salt and phosphorous acid And potassium hydrogen phosphite, calcium salt of phosphorous acid and phosphorous acid and potassium phosphite, calcium salt of phosphorous acid and potassium hydrogen phosphite and potassium phosphite, calcium salt of phosphorous acid and phosphorous acid Acid, potassium hydrogen phosphite, and potassium phosphite, but calcium phosphate and phosphorous acid of phosphorous acid, calcium salt of phosphorous acid and potassium hydrogen phosphite, calcium salt of phosphorous acid and phosphorous acid A combination of potassium phosphite, calcium phosphite, potassium hydrogen phosphite and potassium phosphite is preferable from the viewpoint of fertilizer effect and stability of granular fertilizer composition, among which phosphorous acid More preferred is a combination of calcium salt and phosphorous acid, calcium salt of phosphorous acid and potassium hydrogen phosphite, calcium salt of phosphorous acid, potassium hydrogen phosphite and potassium phosphite, and calcium salt of phosphorous acid The combination of potassium hydrogen phosphite is particularly preferred.

  The blending ratio of component A and component B is such that component A is 0.1 to 10 parts by weight, preferably 0.2 to 5 parts by weight, more preferably 0.5 to 1 part by weight, based on 1 part by weight of component B. Part.

  The total amount of component A and component B may be 1 to 70% by weight, preferably 10 to 50% by weight, based on the total amount of the granular fertilizer composition.

  The granular fertilizer composition of the present invention contains component A, component B, a binder and a solid carrier.

  As the binder used in the present invention, known binders used in this field can be widely used. For example, cellulose, methylcellulose, ethylcellulose, carboxymethylcellulose, hydroxymethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose , Starch, pregelatinized starch, carboxymethyl starch, pullulan, sodium alginate, ammonium alginate, dextran, mannan, pectin, tragacanth gum, mannitol, sorbitol, propylene glycol alginate, guar gum, locust bean gum, gum arabic, xanthan gum, etc. Proteins such as gelatin and casein; polyvinyl alcohol, polyethylene oxide, polyethylene glycol , Sodium polyacrylate, synthetic polymers such as polyvinylpyrrolidone and the like. In addition, dextrin obtained by hydrolysis of starch, various invert sugars or isomerized sugars, specifically glucose, fructose, maltose, sucrose, and sugars such as monosaccharides such as lactose, disaccharides, oligosaccharides, etc. Can be used as a binder.

  Of these binders, carbohydrates or synthetic polymers are preferred. As saccharides, carboxymethylcellulose, hydroxymethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, pregelatinized starch and the like are preferable, and as the synthetic polymer, polyvinyl alcohol and the like are preferable, and among these, pregelatinized starch is particularly preferable.

  These binders can be used individually by 1 type or in mixture of 2 or more types.

  A binder is mix | blended so that it may become 0.01 to 10 weight% normally with respect to granular fertilizer composition whole quantity, Preferably it is 0.1 to 5 weight%.

  As the solid support used in the present invention, a known solid support used in this field can be widely used, for example, bentonite, clay, talc, sodium carbonate, calcium carbonate, dikelite, sericite, Examples include inorganic carriers such as calcium sulfate (gypsum), acid clay, silica stone, diatomaceous earth, pumice, zeolite, vermiculite, white carbon; and organic carriers such as sawdust, straw, pulp, rice husk, straw, bran, corn cob. Among these, inorganic carriers are preferable, and among the inorganic carriers, bentonite, clay, calcium carbonate, and calcium sulfate are preferable, and calcium carbonate and calcium sulfate are particularly preferable from the viewpoint of fertilizer effect. Moreover, it is especially preferable to use bentonite from the viewpoint of the granulation property and properties of the granular fertilizer composition. These solid carriers can be used alone or in combination of two or more.

  A solid support | carrier is normally mix | blended so that it may become 10 to 90 weight% with respect to the granular fertilizer composition whole quantity, Preferably it is 30 to 80 weight%.

  You may mix | blend another component with the granular fertilizer composition of this invention as needed. Other ingredients include chemical fertilizers such as ammonium sulfate, ammonium nitrate, urea, and ammonium, organic fertilizers, known fertilizer components such as fermented animal excrement products, compost, sustained release improvers such as wax, alkyl sulfate esters, Surfactants such as aryl sulfonates, polyoxyethylene glycol ethers, polyhydric alcohol esters, dialkyl sulfosuccinates, polycarboxylic acids, antiseptic / antifungal agents, stabilizers, efficacy enhancers, perfumes, dyes, Various additives, such as a pigment, a coloring agent, and a slip agent, can be illustrated.

In addition, in the granular fertilizer composition of the present invention, a fertilizer component or a trace element is supplied unless phosphites other than Component A and Component B used in the present invention impair the fertilizer effect and the properties of the granular fertilizer composition. You may mix | blend as a source. Examples of such phosphites include sodium hydrogen phosphite (NaH ₂ PO ₃ ) , magnesium hydrogen phosphite (Mg (H ₂ PO ₃ ) ₂ ) , and ammonium hydrogen phosphite ((NH ₄ )). HPHO _3), sodium phosphite (Na ₂ PHO _3), magnesium phosphite (MgPHO _3), ammonium phosphite _{((NH 4) 2 PHO 3} ), phosphorous acid manganese (MnPHO _3), phosphorous acid Examples thereof include iron (II) (FePHO ₃ ), iron (III) phosphite (Fe ₂ (PHO ₃ ) ₃ ), and copper phosphite (CuPHO ₃ ).

  The granular fertilizer composition of this invention is manufactured by the method shown below, for example.

  The granular fertilizer composition of the present invention is not particularly limited, but, for example, according to a normal granulation method such as compression granulation method, extrusion granulation method, stirring granulation method, rolling granulation method, fluidized bed granulation method and the like. Manufactured. Among these granulation methods, the extrusion granulation method is preferable from the viewpoints of easy operation and economy.

  Specific examples of the extrusion granulation method are shown below.

  Component A, Component B, binder, solid carrier and other components as necessary are pulverized using a pulverizer such as a pin mill, hammer mill, ball mill, jet mill, etc., if necessary, and then added to a kneader, etc. Mix. In addition, you may add the component A in the state of aqueous solution. An appropriate amount of water is added to the obtained mixture and kneaded to prepare a kneaded product. The kneading time is usually from several minutes to several tens of minutes depending on the amount of the kneaded material. The kneaded product is granulated using an extrusion granulator such as a basket type extruder or a screw type extruder to produce a granular fertilizer composition. The opening diameter of the screen used at the time of granulation is usually about 0.3 to 5 mm, and about 0.5 to 3 mm is preferable from the viewpoint of industrial production and workability. Next, the granular fertilizer composition of the present invention can be produced by drying the granular fertilizer composition at room temperature to 150 ° C. usually using a dryer such as a fluidized bed dryer.

  The shape of the granular fertilizer composition of the present invention thus obtained is a cylinder and the size is not particularly limited, but the diameter is usually 0.3 to 5 mm, preferably 0. The length is 5 to 3 mm, and the length is usually 0.1 to 10 mm, preferably 0.5 to 5 mm.

  The granular fertilizer composition of the present invention can be used as it is, and may be applied to the cultivated soil or medium of the crop, and basically may be applied so as to exist in the rhizosphere region of the crop.

  As a fertilizing method (usage method) of the granular fertilizer composition of the present invention, there is a method of applying an appropriate amount to the plant stock as appropriate depending on the growth state of the crop. The method of fertilizing can be mentioned preferably.

  When the granular fertilizer composition of the present invention is applied to the entire surface of the cultivated soil or medium before or during planting, it is preferably mixed with the soil or medium using a tractor or the like when the area is large.

The amount of the granular fertilizer composition of the present invention is appropriately set depending on the content of phosphorous acid or a salt thereof, etc., but 1 to 12 kg per 1000 m ^{2 in} terms of P ₂ O ₅ , preferably 3 to 1000 m ^2. The amount may be 6 kg.

  The granular fertilizer composition of the present invention is superior to a general phosphate fertilizer in terms of fertilizer effect, and has a very excellent effect that growth is good and phytotoxicity to crops can be suppressed.

  The granular fertilizer composition of the present invention makes it possible to use phosphorous acid or a salt thereof, which has been considered to be substantially inappropriate as a fertilizer for soil treatment, as a fertilizer for soil treatment. Excellent growth effect and long-term fertilizer effect can be expressed.

  Moreover, the granular fertilizer composition of this invention is excellent in handleability, and can make a fertilization operation | work easy.

  The granular fertilizer composition of the present invention has good disintegration properties in soil and water, and can appropriately provide the phosphorus component of the used phosphorous acid or a salt thereof to a crop. This good disintegration property is not impaired even when the granular fertilizer composition is stored for a long period of time. In addition, the granular fertilizer composition of the present invention does not cause condensation or blocking during a long storage period. Therefore, the granular fertilizer composition of the present invention can be stored for a long period of time, which is advantageous in distribution.

  The granular fertilizer composition of the present invention is solid, and compared with known aqueous phosphorous acid aqueous fertilizers, it can save labor for manure application work, that is, the work of dissolving in water, fertilizer weight by water dilution In addition, a great contribution can be expected, for example, that there is no increase in volume, and that it is possible to fertilize the required amount at once and that the number of times of fertilization can be reduced.

  Hereinafter, the present invention will be further clarified by examples, but the present invention is not limited to these examples.

Production Example 1
The following were used as phosphorous acid or a salt thereof, a binder and a solid carrier.
Component A;
(A-1): Phosphorous acid (H ₃ PO ₃ )
(A-2): Potassium hydrogen phosphite (KHPHO ₃ )
(A-3): Potassium phosphite (K ₂ PHO ₃ )
Component B;
(B-1): Calcium phosphite (CaHPO ₃ )
Binders;
(C-1): pregelatinized starch solid carrier;
(D-1): Bentonite (D-2): Kaolin clay (D-3): Calcium carbonate (D-4): Calcium sulfate The blending ratio (% by weight) described in Tables 1 and 2 is used for the kneader. Phosphoric acid or a salt thereof (if necessary, pulverized using a pulverizer such as a pin mill, hammer mill, ball mill, jet mill, etc.), a binder and a solid carrier, and an appropriate amount to the resulting mixture Was added and further kneaded to prepare a kneaded product. The obtained kneaded material is granulated with a single dome gran (extruder granulator made by Fuji powder) with a 0.8 mm diameter screen, and then dried and sieved at 60 ° C. for 1 hour. 0.8 mm granular fertilizer compositions 1 to 12 (hereinafter referred to as granular fertilizers 1 to 12, respectively) were obtained.
Moreover, it carried out similarly to the above by the mixture ratio described in Tables 3-4, and obtained the comparative granular fertilizers 1-15.

Test example 1 (phytotoxicity test 1)
Cultivation medium (coconut shell (60%): sand (20%): perlite (10%): Kanuma soil (10%)) 10 liters and 18 g of granular fertilizer 12 (corresponding to 72 g / m ² in terms of P ₂ O ₅ ) Were mixed, put in a Wagner pot (1/200000 m ² , surface area 500 cm ² ), planted with a single Komatsuna seedling (variety: Natsu Rakuten, Takii Seed Co., Ltd.), sufficiently irrigated to moisten the medium.

On the other hand, as a comparative test, without fertilizing granular fertilizer 12, after transplanting Komatsuna seedlings, 7.5 ml of commercially available phosphorous acid liquid fertilizer (32% in terms of P ₂ O ₅ ) (72 g / m ^{2 in} terms of P ₂ O ₅ ) Equivalent to the stock) and left in the same manner.

  As a result, when the granular fertilizer 12 of the present invention was used, no phytotoxicity was observed in the seedlings, but when the commercial phosphorous acid liquid fertilizer of the comparative test was used, it was deflated and overlaid.

Test example 2 (phytotoxicity test 2)
The test was conducted in the same manner as in Test Example 1 using tomato seedlings (variety: Momotaro York, Takii Seed Co., Ltd.).

  As a result, as in Test Example 1, when the granular fertilizer 12 of the present invention was used, no phytotoxicity was observed, but when using the commercially available phosphorous acid liquid fertilizer of the comparative test, Test Example Like 1 Komatsuna, it withered and surrendered.

Test example 3 (fertilizer effect test 1)
Cultivation medium (coconut shell (60%): sand (20%): perlite (10%): Kanuma soil (10%)) 10 liters of granular fertilizer 1-12 and comparative granular fertilizer 1-15 are converted to P ₂ O ₅ Were added and mixed so as to be 3 kg / 1000 m ² , 6 kg / 1000 m ² or 12 kg / 1000 m ^2, and placed in a Wagner pot (1/200000 m ² , surface area 500 cm ² , 252φ × 300 mm). One seedling of Komatsuna (variety: Natsu Rakuten, Takii Seedling Co., Ltd.) was planted, and water was appropriately given until the roots settled. After fertilization, the liquid manure was irrigated and allowed to grow for 30 days.
As a target, a commercially available phosphate fertilizer (granular superphosphate: 17.5% in terms of P ₂ O ₅ ) was used, and the same amount was fertilized in terms of P ₂ O ₅ and grown under the same conditions.

  The dry weights of the stems and roots of the grown Japanese mustard spinach and the roots were measured, and the ratio when the result with a commercially available phosphate fertilizer was set to 100 was determined.

  The results are shown in Tables 5 and 6.

In order to compare the fertilizer effects of granular fertilizer 1 and comparative granular fertilizer 1, granular fertilizer 2 and comparative granular fertilizer 2, granular fertilizer 3 and granular fertilizer 3, granular fertilizer 4 and comparative granular fertilizer 4, P ₂ O ₅ The test results (stem and leaf dry weight and root dry weight) at 6 kg / 1000 m ² in terms of conversion are shown in FIG.
Furthermore, the test results (stem and leaf part dry weight and root part dry weight) of granular fertilizers 2, 6, and 10 at 6 kg / 1000 m ² in terms of P ₂ O ₅ are shown in FIG.

Test example 4 (fertilizer effect test 2)
Cultivation medium (coconut shell (60%): sand (20%): perlite (10%): Kanuma soil (10%)) 10 liters of granular fertilizer 1-12 and comparative granular fertilizer 1-15 are converted to P ₂ O ₅ Was added to and mixed with 3 kg / 10a, 6 kg / 1000 m ² or 12 kg / 1000 m ^2, and placed in a Wagner pot (1/200000 m ² , surface area 500 cm ² , 252φ × 300 mm). Three seedlings of green onions (variety: Kamo head leek, Nakahara Seed Co., Ltd.) were planted, and water was appropriately given until the roots settled. After fertilization, the liquid manure was irrigated and allowed to grow for 40 days.
As a target, a commercially available phosphate fertilizer (granular superphosphate: 17.5% in terms of P ₂ O ₅ ) was used, and the same amount was fertilized in terms of P ₂ O ₅ and grown under the same conditions.

  The dry weight of each of the stems and roots of the grown leek was measured, and the ratio when the result with a commercially available phosphate fertilizer was set to 100 was determined.

  The results are shown in Table 7 and Table 8.

In order to compare the fertilizer effects of granular fertilizer 1 and comparative granular fertilizer 1, granular fertilizer 2 and comparative granular fertilizer 2, granular fertilizer 3 and granular fertilizer 3, granular fertilizer 4 and comparative granular fertilizer 4, P ₂ O ₅ FIG. 3 shows the test results (stem and leaf portion dry matter weight and root portion dry matter weight) at a conversion of 6 kg / 10a.
Furthermore, the test results (stem and leaf part dry weight and root part dry weight) of granular fertilizers 2, 6, and 10 at 6 kg / 10a in terms of P ₂ O ₅ are shown in FIG.

Test Example 5 (Fertilizer effect test 3)
Cultivation medium (coconut shell (60%): sand (20%): perlite (10%): Kanuma soil (10%)) 10 liters of granular fertilizer 1-12 and comparative granular fertilizer 1-15 are converted to P ₂ O ₅ Was added and mixed so as to be 3 kg / 1000 m ² , 6 kg / 10a or 12 kg / 1000 m ^2, and put in a Wagner pot (1/200000 m ² , surface area 500 cm ² , 252φ × 300 mm). One seedling of tomato (variety: Momotaro York, Takii Seed Co., Ltd.) was planted, and water was appropriately given until the roots were settled. After fertilization, the liquid manure was irrigated and allowed to grow for 30 days.
As a target, a commercially available phosphate fertilizer (granular superphosphate lime: 17.5% in terms of P ₂ O ₅ ) was used, and the same amount was fertilized in terms of P ₂ O ₅ and grown under the same conditions.
The dry weight of each of the stems and roots of the grown tomato was measured, and the ratio when the result with a commercially available phosphate fertilizer was set to 100 was determined.

  The results are shown in Table 9 and Table 10.

In order to compare the fertilizer effects of granular fertilizer 1 and comparative granular fertilizer 1, granular fertilizer 2 and comparative granular fertilizer 2, granular fertilizer 3 and granular fertilizer 3, granular fertilizer 4 and comparative granular fertilizer 4, P ₂ O ₅ FIG. 5 shows the test results (stem and leaf part dry weight and root part dry weight) in terms of 6 kg / 10a.
Furthermore, the test results (stem and leaf part dry weight and root part dry weight) of granular fertilizers 2, 6, and 10 at 6 kg / 1000 m ² in terms of P ₂ O ₅ are shown in FIG.

Test example 6 (sound growth test)
1 g of bentgrass seeds was placed in a 200 ml Erlenmeyer flask, 5 ml of water was added and dispersed uniformly, and then autoclaved (120 ° C., 20 minutes). This was inoculated with Pythium irregulare, cultured for 5 days (25 ° C), removed after the flora covered the whole seed surface, and mixed with 50 ml of sterile soil (120 ° C, 60 minutes) using a sterile mortar. And stored in a thermostatic oven at 25 ° C. for 1 day to make an inoculum. The prepared inoculation source was mixed with 20 times the amount of soil to make contaminated soil.

  A 12cm silver vinyl pot (diameter 12cm, depth 10cm) is filled with 250ml of soil (Aina No.2), 200ml of contaminated soil is packed on it (to a depth of 6cm), lightly irrigated, and then green onions (duck head leek, 27 seeds (0.054 g) were sown.

After sowing, the treated area that was surface treated to be terms _of P ₂ O ₅ at 6 kg / 1000 m ² or 12 kg / 1000 m ² subjected試肥charge (particulate perphosphates lime as granular fertilizer 1 to 12 or Comparative agent), subjected A contaminated soil-free treatment zone where no fertilizer was treated was prepared, and the number of healthy seedlings in each treatment zone or the contaminated soil-free treatment zone 21 days after sowing was investigated.

  The healthy seedlings were grown in the same condition as normal seedlings in a disease-free soil-free treatment zone that was a soil that did not contain contaminated soil and did not treat the test fertilizer, and the healthy seedling rate was calculated according to the following formula.

  The results are shown in Table 11.

  From the above results, it is clear that the granular fertilizer composition of the present invention has an excellent effect on crop growth.

  The granular fertilizer composition of the present invention has an excellent fertilizing effect, and a crop cultivated by applying the granular fertilizer composition has good growth.

FIG. 1 is a graph showing the test results obtained in Test Example 3. FIG. 2 is a graph showing the test results obtained in Test Example 3. FIG. 3 is a graph showing the test results obtained in Test Example 4. FIG. 4 is a graph showing the test results obtained in Test Example 4. FIG. 5 is a graph showing the test results obtained in Test Example 5. FIG. 6 is a graph showing the test results obtained in Test Example 5.

Claims (8)

(Component A) A granular fertilizer composition containing at least one selected from the group of phosphorous acid, potassium hydrogen phosphite and potassium phosphite and (Component B) a calcium salt of phosphorous acid. The granular fertilizer composition according to claim 1, comprising Component A, Component B, a binder and a solid carrier. The granular fertilizer composition according to claim 1 or 2, wherein Component B is calcium hydrogen phosphite or calcium phosphite. The granular fertilizer composition according to claim 2, wherein the solid carrier is at least one selected from bentonite, clay, calcium sulfate and calcium carbonate. The granular fertilizer composition according to any one of claims 1 to 4, wherein the mixing ratio of component A and component B is 0.1 to 10 parts by weight of component A with respect to 1 part by weight of component B. The granular fertilizer composition of Claim 1 obtained by knead | mixing component A, component B, a binder, and a solid support | carrier, and carrying out extrusion granulation. The usage method of the granular fertilizer composition which fertilizes the granular fertilizer composition in any one of Claims 1-6 to cultivation soil or a culture medium before the planting of a crop, or at the time of planting. The use method of the granular fertilizer composition which fertilizes the granular fertilizer composition in any one of Claims 1-6 to cultivation soil or a culture medium as additional fertilizer in the crop growth process.

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