Diammonium phosphate contains 18% nitrogen, 46% phosphorus, and total nutrients up to 64%. It has the characteristics of low nitrogen, high phosphorus, and no potassium in nutrient supply. It is particularly effective in phosphorus-deficient soils.
Practice has shown that diammonium phosphate can be used in many types of soils in paddy fields and dry lands. It is suitable for most crops such as rice, wheat, corn, sweet potatoes, peanuts, rapeseeds, peanuts, etc. It is particularly suitable for sugar and sugarcane, alfalfa and other nitrogen-need phosphorus crops.
Diammonium phosphate can be used in combination with ammonium bicarbonate, urea, ammonium chloride, potassium chloride, ammonium nitrate and other fertilizers to avoid application of mixed fertilizers such as ammonium sulfate and superphosphate.
Tests have shown that diammonium phosphate combined with nitrogen and potassium fertilizers (chlorinated crops must not use chlorine-containing fertilizers) is the most suitable for basal fertilizer application, with a dosage of 225 to 300 kg/ha. In the paddy fields, shallow water layer is applied after the plowing, and the flat land is applied; in the dry land, deep plowing is applied during tillage and tillage, and the soil is fully mixed. The diammonium phosphate and the neutral organic fertilizer are mixed and piled up, and the fertilizer effect is the best. When used as a fertilizer, it should be applied 1 to 2 days before sowing at a dosage of 100-150 kg/ha. The soil is mixed evenly to avoid direct contact between the seed and the fertilizer.
For diammonium phosphate solution fertilization, diammonium phosphate (depending on the type of crop and potassium fertilizer) should be dissolved in water at room temperature at the ratio of 1:5 in the fertilizing area 1 to 2 days before fertilization, and the mixture should be stirred several times until the fertilizer is completely dissolved. After the fertilizer solution is diluted 1:25~30 with water, it can also be dissolved by biogas fertilizer, and its fertilizer solution is 60~80 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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