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Ammoniacal superphosphate. After ammoniation, the superphosphate can not only "recognize nitrogen and promote phosphorus", but also produce ammonium dihydrogen phosphate to improve the utilization rate of nitrogen fertilizer. Ammonated superphosphate is a compound fertilizer with less nitrogen and less phosphorus. It should be applied to phosphorus-deficient soil and pay attention to nitrogen fertilizer. The method for producing ammoniated superphosphate is:
1. Wet: Mix ammonia bicarbonate with water (the ratio of fertilizer to water is 1:1), dilute to ammonium bicarbonate solution, sprinkle with superphosphate and stir repeatedly to achieve slightly acidic, piled up for a few days to make superphosphate Calcium can be administered by full ammoniation.
2. Dry: In order to prevent the product from being too wet, solid ammonium hydrogencarbonate can also be used. Calcium superphosphate and ammonium bicarbonate are separately pulverized, sieved, and then thoroughly mixed. When making, it is important to grasp the ratio of ammonium bicarbonate to phosphate fertilizer. Generally, it is 1:4-6, that is, 1 kg of ammonium bicarbonate is mixed with 4 kg to 6 kg of superphosphate to make it slightly acidic. When the fertilizer is dry, the two do not work together. If there is a squeaking sound during mixing, this is a normal phenomenon.
Second, the particles of superphosphate. The application of calcium superphosphate as granules can greatly reduce the contact area with the soil and reduce the chance of phosphorus being fixed by the soil. Secondly, the application of granular superphosphate can form a region with high nutrient content in the soil for crops to be absorbed and utilized, and it is not affected by the excessive concentration of phosphorus.
Superphosphate is commonly known as calcium, mostly grayish white powder, which is a chemical phosphate commonly used in agricultural production. After the application of powdered superphosphate, the water-soluble phosphoric acid contained in it will dissolve in the soil moisture quickly, and it will easily react with the inorganic elements in the soil to reduce the fertilizer efficiency. The general utilization rate is only 10%-15%. In order to improve its non-smallness, two new methods of fertilization are introduced:
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