1, urea topsoil after irrigating irrigation, even with flood irrigation caused by 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. 2-3 days after topdressing and 6-8 days after spring and autumn. 2, superphosphate direct seed dressing. Superphosphate contains 3.5-5% free acid, which is highly corrosive. If superphosphate is directly used for seed dressing, especially if it is stored for a long time after seed dressing, it will easily corrode seeds and reduce seed germination rate and emergence rate. 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. 3, diammonium phosphate is applied with water. After diammonium phosphate is applied with water, it is very easy to cause the loss of nitrogen in the volatilization. Phosphorus only 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. 4. Superficial application of ammonium bicarbonate and tight cover soil, resulting in low fertilizer utilization. Therefore, the application of ammonium bicarbonate should be deeply applied to the soil and timely watering, so that ammonia is fully absorbed by the soil to improve fertilizer efficiency. Tests have shown that deep application of ammonium bicarbonate can increase utilization by 10-30%. Percussion Massage Gun, Electric Massage Gun, Impact Massage Gun, Electric Massager Ningbo Prestigeplus Commodity Co.,Ltd , https://www.prestigemedics.com