Fertilizer products known as “diammonium” in the agricultural capital market are dazzling, such as “polypeptide diammonium phosphate”, “urea formaldehyde diammonium”, “dinitromonophosphate”, “triammonium phosphate”, “organic,” Inorganic diammonium, etc., make people really difficult to distinguish, nowhere to follow suit.

How do you say "polypeptide diammonium phosphate" and "urea formaldehyde diammonium"? Through Baidu search, did not find relevant information. “Triammonium phosphate” is a chemical raw material rather than a fertilizer, but some companies have added some potassium or some potassium-containing raw materials on the basis of diammonium phosphate, and DAP has transformed into “triammonium phosphate” for sale. What's more, some companies produce “organic, inorganic diammonium” products. They are labeled with NPK content 64%, organic matter content 30%, humic acid content 40%, and trace element content 20% on chemical fertilizer bags. Its fertilizer efficiency is far better than ordinary diammonium. In fact, this fertilizer belongs to the product of Zhang Guan and Li Dai, but it is a product of organic fertilizer and diammonium.

The author once contacted the representative of the company that sold the product in the name of the dealer and asked if the content could meet the standard. The company representative told us that a bag of 50 kg of “diammonium” contains 25 kg of diammonium with a content of 64%, and 25 kg of organic fertilizer. If the particles are separated during the test, the content of diammonium in the simplification test is acceptable, if the test is mixed. Failed. Ask again if the country has this fertilizer standard. The enterprise representative said that this is a corporate standard and a standard set by the enterprise. It is said to be qualified if it is qualified.

Therefore, when purchasing "Diammonium," farmers' friends must buy products from regular enterprises, and must not allow people to mistake and temporarily misunderstand people for one year.

Do not implement "national standard" as a problem product

For diammonium phosphate, the packaging bag should include fertilizer name, trade mark, specification grade, net content, nutrient content, manufacturer address, telephone and lot number, and implementation standards. The illustration of the product packaging label is "Diammonium Phosphate" and the implementation standard is Q/CGYZ004-2006, which is an enterprise standard. The content of phosphorus is only 12%, which is far below the national compulsory standards for diammonium phosphate (GB10205-2009, Phosphorus content qualified products minimum 39.0%) requirements, and the name does not meet the requirements of national standards, and marked with the words "U.S. technology", misleading, is false "diammonium phosphate."

Identification of diammonium phosphate

At present, the market uses more granular particles of superphosphate, pseudo-diammonium phosphate, but also the use of particulate superphosphate as a nitrophosphate or heavy calcium. The color, particle shape, and compressive strength of these fertilizers are similar, but they are composed of The differences in species, nutrient content, and price are significant and can be identified by the following methods:

Look at the appearance

Diammonium phosphate is dark brown in the absence of moisture, its edges are slightly yellow, and its outer edge is slightly translucent. Its surface is slightly smooth and irregular. The particles are dark brown and dark, and have no yellow color. Edge transparency. After wet, the particles perform the same as moisture, and a very small amount of white powder appears on the surface; Nitrophosphate has obvious transparent sensation, the surface of the particles is smooth, and the particles are dark brown irregular particles; the heavy calcium phosphate particles are dark gray particles. Calcium phosphate particles are light in color, grayish, and light gray, and have poor surface smoothness.

Water soluble method

Nitrophosphate, diammonium phosphate, and heavy superphosphate all dissolve in water, and particulate superphosphate is not completely soluble in water.

Burning

Diammonium phosphate, nitric acid, and phosphate fertilizers can rapidly melt on red charcoal and release ammonia. Heavy calcium phosphate and calcium phosphate do not have ammonia smell, especially superphosphate, and the shape of the particles does not change at all.

Laboratory for quantitative analysis

If necessary, quantitative analysis can be done through laboratories.

How to use diammonium phosphate

Diammonium phosphate is a binary high-concentration compound fertilizer with low nitrogen and high phosphorus content. Diammonium phosphate containing N18%, P2O546% total nutrients up to 64% of the high concentration. The nutrient supply has the characteristics of low nitrogen and high phosphorus without potassium. It is particularly effective on phosphorus-deficient soils. The use of diammonium phosphate is described in detail today.

1. Practice has shown that DAP can be used for fertilizing a variety of soil types in paddy fields and dry lands. It is suitable for most crops such as rice, wheat, corn, sweet potatoes, peanuts, rapeseeds, and peanuts, and is particularly suitable for use in sugarcane pods and other HTP crops.

2, diammonium phosphate can be combined with ammonium bicarbonate, urea, ammonium chloride, potassium chloride, ammonium nitrate and other fertilizers, avoid mixing with ammonium sulfate and superphosphate and other acidic fertilizers.

3. Tests showed that DAP combined with nitrogen fertilizer and potash fertilizer (chlorinated crops must not use chlorine-containing fertilizers) was the most suitable for the application of crop basal fertilizer with a dosage of 225~300kg/h?; applied in paddy fields: shallow water layer after plowing The application of dry land: deep plowing and plowing, fertilizer and soil fully mixed. The diammonium phosphate and the neutral organic fertilizer are well mixed and piled up for application. The fertilizer effect is the best. When used as a fertilizer, it should be applied 1~2 days before sowing, and the amount should be 100~150kg/h. The fertilizer should be mixed evenly to avoid direct contact between the seed and the fertilizer.

4. For fertilization with diammonium phosphate solution, diammonium phosphate (depending on the type of crop and potassium fertilizer) should be dissolved at the ratio of 1:5 at room temperature before fertilization, and the mixture should be stirred several times until the fertilizer is complete. After the solution is dissolved, the fertilizer solution is diluted 1:25 to 30 with water to dilute it. It can also be dissolved by biogas fertilizer, and the fertilizer solution is 60 to 80 times watered. The fertilization concentration should be lighter at the seedling stage or when the soil is dry, and the fertilization concentration can be appropriately increased during the adult stage and soil moisture.

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