Superphosphate direct seed dressing, superphosphate contains 3.5% ~ 5% free acid, corrosive, such as superphosphate direct seed dressing, especially after storage for a long time, it is easy to produce corrosion of the seed, Reduce seed germination and emergence. Therefore, superphosphate is used as a seed fertilizer, the best form or hole is applied in the sowing ditch, and the soil is used to separate the fertilizer from the seed. When diammonium phosphate is applied with water and diammonium phosphate is applied with water, it can easily cause a loss of nitrogen in the evaporation. Phosphorus also stays on the surface and is not easily sent to the rhizosphere of the crop. Crops have neither nitrogen nor phosphorus, and diammonium phosphate is not equal to white. Therefore, the diammonium phosphate should promote the basic application. If it is used as top dressing, it should be applied early, deep in the ditch, covered with soil after application, and it is generally required that the ditch is about 10 cm deep. The surface of the ammonium bicarbonate surface is shallow and the cover soil is not tight, resulting in low fertilizer utilization. Therefore, the application of ammonium bicarbonate should be deeply applied to the soil and watered in time so that the ammonia can be fully adsorbed by the soil to improve the fertilizer efficiency. Tests have shown that the deep application of ammonium bicarbonate can increase the utilization rate by 10% to 30%.
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After urea topsoil is applied, it is eager to irrigate, even with flood irrigation to cause loss of urea. Therefore, when urea is applied, it should be ditched, applied or applied, and the depth of fertilization should be 7~10 cm, and then cover the soil immediately and pay attention to even fertilization. 2 to 3 days after topdressing, and 6 to 8 days after spring and autumn.