JPH09100190A - Organic neutral liquid fertilizer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a fertilizer well-balanced among nitrogen, phosphoric acid and potassium, at the same time containing them each in a high concentration and having improved storability and preservability. SOLUTION: This organic neutral liquid fertilizer is obtained by adding a thickener to a solution prepared by dissolving nitrogen, phosphoric acid, potassium and an organic acid as essential components in water. The nitrogen, phosphoric acid and potassium are each contained in a concentration of 8-15%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an organic neutral liquid fertilizer, and more particularly to an organic neutral liquid fertilizer containing nitrogen, phosphoric acid and potassium in a high concentration and having good storage stability.

[0002]

2. Description of the Related Art Currently, all chemical fertilizers except for urea are granulated, powdered, or liquid fertilizers using salts as a main raw material, all of which exhibit strong acidity. Is the most.

For example, ammonium sulfate has a pH of 4.0
4.5 Strongly acidic fertilizer. Potassium fertilizer is also mainly composed of potassium sulfate and potassium chloride, so that it contains a large amount of inorganic salts such as sulfate as in ammonium sulfate. Furthermore, the raw material of the phosphate fertilizer is mainly composed of liquid phosphoric acid and is strongly acidic. Therefore, in order to neutralize it, lime combined with lime or organic phosphate combined with clay. It is commercially available as an acid-soluble phosphate fertilizer coated with gypsum.

[0004]

When any of the above fertilizers is applied to a field or a paddy field, inorganic salts such as sulfates are diffused and accumulated in upland soil or paddy field soil to form a strongly acidic soil having a pH of 4.0 to 4.5. Cultivated land becomes a salt accumulation soil, hinders the growth of crops and plants, causes rooting and planting, and causes continuous cropping problems. In addition, ammonium sulfate decomposes in strongly acidic soil to form nitrite nitrogen, making it impossible to produce normal proteins and starch, and increasing the rate of accumulation in stems and leaves in the form of undigested nitrogen protein, Resistance to high and low temperatures is weakened. As a result, undigested proteins of stems and leaves under high temperature management gasify inside the cells and cause cell explosion, which causes many plants to be affected by molds and powdery mildews, which is an agricultural problem. I have. In order to prevent strong acidification of the soil in fields and paddy fields and maintain healthy soil, the development of neutral sulfate-free fertilizers has been greatly demanded by society.

However, in the case of liquid fertilizers, a large amount of reaction between a strong acid and a strong alkali is extremely dangerous and can cause a large explosion. I wasn't.

[0006]

Means for Solving the Problems The inventors of the present invention have conducted extensive research on prevention of explosive generation of the heat of neutralization reaction between acid and alkali, and as a result, neutralized acid and alkali in an organic acid solution. By this, it is possible to effectively suppress the explosive generation of this heat of neutralization, and the obtained neutral liquid fertilizer contains high concentrations of nitrogen, phosphoric acid and potassium, respectively, and it is possible to form crystals and precipitates over a long period of time. The present invention has been completed by finding that it does not occur and is excellent in storability and storability.

That is, according to the present invention, a thickener is added to a solution prepared by dissolving nitrogen, phosphoric acid, potassium and an organic acid as essential components in water, and the contents of nitrogen, phosphoric acid and potassium are respectively contained. It is an organic neutral liquid fertilizer characterized by 8 to 15%.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, ammonium sulfate, urea, liquefied ammonia, aqueous ammonia, etc. are usually used as the nitrogen component. Liquid phosphoric acid is usually used as the phosphoric acid component. Further, caustic potash is usually used as the potash component. Examples of the thickener include synthetic resins such as polyvinyl alcohol, sodium alginate and seaweed extract. All of these thickeners are nitrogen,
Although it has a property of wrapping an effective fertilizer component of phosphoric acid and potassium to impart a slowing effect, sodium alginate is particularly preferable because it also has a pH buffering action.

Examples of the amino acid include a mixture of L-amino acids obtained by decomposing natural proteins, and specifically, a mixture of L-amino acids prepared from horse and cow hooves hydrolyzate is used. In addition to chelating iron and copper sulfate, the liquid fertilizer is colored green mosque to enhance the aesthetic sensation of the product, and also has the effect of making it easier to receive light when attached to the leaves and stems of the plant. In addition, iron ammonium citrate can be used in place of the mixture of the above-mentioned chelated iron and copper sulfate.

[0010] The organic neutral liquid fertilizer of the present invention may contain trace elements (for example, Mn, Fe, B, Cu, Z) in addition to the above components.
n, Cl). Thus, examples of organic acids include citric acid, acetic acid, malic acid, fumaric acid and the like.

A feature of the present invention is to provide an organic neutral liquid fertilizer that does not acidify soil. Such an organic neutral liquid fertilizer is prepared by (a) adding an organic acid to water with stirring. (B) Dissolve the organic acid solution in the above-mentioned organic acid solution by gradually stirring 1/3 of the required amount of liquid phosphoric acid; (c) Add 1/3 of the required amount of caustic potash to the mixture. Temperature
When the temperature reached 90 ° C., gradually adding the urea at a temperature of about 40 ° C. to the above mixture at a time while regulating the temperature to 60 ° C. or lower. (E) Repeating the above steps (b) to (d) twice again; (f) further adding a thickener and an amino acid; and (g) finally chelating iron and copper sulfate. Alternatively, it is obtained by adding and mixing iron ammonium citrate instead of them.

That is, in the method for producing an organic neutral liquid fertilizer of the present invention, generation of explosive heat of neutralization is suppressed by neutralizing a strong acid and a strong alkali in an aqueous solution of an organic acid. The method of suppressing the explosive generation of the heat of neutralization is, specifically, one-third of the required amount of phosphoric acid, and in a commonly used 200 liter reaction tank, one-third of the amount in an organic acid aqueous solution. And gradually dissolve at about room temperature, then add caustic potash in a small amount of 1/3 of the required amount so that the temperature does not rise above 60 ° C. When the temperature reaches 90 ° C, 1/3 of the required amount of urea is added at once and stirred to rapidly lower the temperature of the reaction solution to 50-60 ° C to prevent nitrogen vaporization and evaporation. . Thus, the reaction between the low pH liquid phosphoric acid and the high pH caustic cauli flakes using the organic acid and urea as the medium can be performed while preventing explosive heat of neutralization. This is repeated several times, specifically two more times to complete the neutralization reaction, and the number of times is determined by the size of the reaction vessel and the cooling capacity of the reaction apparatus.
A 200-300 liter container is usually divided into three batches.

In the above description, phosphoric acid, caustic potash,
Although urea was added and mixed in the order, phosphoric acid, urea, and potassium hydroxide were added in this order, and explosive generation of reaction heat can be similarly prevented. According to the above method, since the maximum temperature during production can be suppressed to 90 ° C, volatilization and emission of nitrogen components can be prevented, nitrogen, phosphoric acid, and potassium can be balanced and each component has a high concentration. It is possible to obtain an organic neutral liquid fertilizer containing 8 to 15%.

The organic neutral liquid fertilizer of the present invention is excellent in storability and storability although it contains nitrogen, phosphoric acid and potassium at high concentrations. Specifically, 1 at 0 ° C
No crystals or precipitates were observed even if left for a week. Such an organic neutral liquid fertilizer has never existed before.

[0015]

The present invention will be described below in detail with reference to examples, but the present invention is not limited to these examples. Example 1 100 liters of water was charged into an enamel tank equipped with a stirrer having a capacity of 200 liters, a thermometer, and a water cooling device, and 1 kg of citric acid was charged and dissolved while stirring. Next, 18 kg of 75% liquid phosphoric acid is gradually added to an aqueous solution of citric acid at a temperature of 17 ° C. over 30 minutes while stirring in 18 kg portions. After 30 minutes, the temperature of the mixture was 28-30 ° C. 17 kg of flaky caustic potash was added to this mixture under stirring for 1 hour in 30 kg.
Add gradually while controlling to 60 ° C. Temperature after addition is 90
To ℃. When the temperature of the mixed solution reaches 90 ° C., 20 kg of white crystalline urea is poured at once. The temperature of the mixture drops rapidly to about 40 ° C. After this, 18 kg of the above liquid phosphoric acid,
The addition and addition of 17 kg of flaky caustic potash and 20 kg of crystalline urea are repeated twice. After the completion of the above steps, 2 kg of a sodium alginate and 0.2 kg of a mixture of L-amino acids prepared from the hydrolyzate of horseshoe are gradually added and dissolved to give the mixture a viscosity. Next, 800 g of chelated iron is dissolved in 5 liters of hot water, and a mixed solution obtained by adding and dissolving 400 g of copper sulfate is added to and mixed with the above viscous liquid to obtain a clean mosque-colored viscous liquid. The pH of this organic neutral liquid fertilizer is 7.0.

Example 2 Into the same enamel tank as in Example 1, 85 liters of water was charged, and 1 kg of citric acid was added and dissolved while stirring. Next, 18 kg of liquid phosphoric acid was gradually added and mixed into the citric acid aqueous solution while stirring 1 kg at a time. Under stirring
Add gradually and mix in 1.7kg increments. Due to the generation of heat of neutralization, the temperature of the mixed solution rises to about 75 ° C., but stirring is continued for about 25 minutes, and when the temperature drops to about 50 ° C., liquid phosphoric acid is added again. In this manner, the addition and addition of the above-described liquid phosphoric acid, crystalline urea, and flaky potash are repeated. Thereafter, sodium alginate, amino acids, chelated iron and copper sulfate were added in exactly the same manner as in Example 1 to obtain a green mosque-colored organic neutral liquid fertilizer.

The content of nitrogen (N), phosphoric acid (P ₂ O ₅ ) and potassium (K ₂ O) in this organic neutral liquid fertilizer is about 1
2%, very high concentration. The pH is 7.0
It is.

[0018]

EFFECTS OF THE INVENTION According to the present invention, nitrogen, phosphoric acid and potassium are well balanced and each component has a high concentration (8 to 15%).
In addition, the crystals and precipitation do not occur for a long time,
It is possible to obtain an organic neutral liquid fertilizer having excellent storability and storability. By applying such an organic neutral liquid fertilizer of the present invention, soil acidification can be prevented, normal fertilizer absorption can be increased, disease and insect damage can be reduced, and crops can be grown healthy. In addition, since it is not acidic, it is well adsorbed to the soil colloid and does not run off, so it is useful for preventing environmental destruction and can be a useful fertilizer for preventing pollution.

Claims (1)

[Claims] 1. A thickener is added to a solution of nitrogen, phosphoric acid, potassium, and an organic acid dissolved in water as essential components,
An organic neutral liquid fertilizer characterized in that the contents of nitrogen, phosphoric acid and potassium are each 8 to 15%.