How to use good flushing fertilizer?

How to use good flushing fertilizer? Please introduce the correct selection of fertilizer types for irrigation and fertilization at first. Only water-soluble fertilizers can be applied with water. Urea, ammonia, ammonium sulfate and ammonium nitrate are commonly used in nitrogen fertilizer; potassium chloride and potassium sulfate can also be used in potash fertilizer. Do not apply water-soluble monoammonium phosphate and diammonium phosphate in phosphate fertilizer, because the mobility of phosphate fertilizer is poor after dissolution, it is easy to be fixed, and can not infiltrate into the root layer with water. For this reason, the best way to apply phosphate fertilizer is to bury it in the soil layer by layer in order to improve its utilization rate. The nutrient content of a single irrigation and fertilization must be standardized. In the cultivation of high-yield vegetables, the amount of pure nitrogen should be controlled at 2 to 4 kg / mu each time, especially nitrate nitrogen should be controlled below 2 to 3 kg / mu, and the limited number of potassium fertilizer (potassium oxide) should be controlled at 2 to 4 kg / mu. Otherwise, the waste and loss of nutrients is large, which not only reduces the nitrogen use efficiency, but also may cause water pollution. It is generally appropriate to apply fertilizer twice in the whole growth period. The period of irrigation and fertilization of crops is in the period of mass growth of crops. For example, fruits and vegetables are applied in the full fruit period and after picking melons and fruits; another example is the blanching period of Chinese cabbage, in which the temperature drops and the soil mineralization decreases, while vegetable crops are suitable for a large number of growing periods. The control of irrigation quantity. Border irrigation mode to prevent flood irrigation, canal irrigation, ditch depth is compatible with the amount of water, to prevent the loss of nutrients dissolved in water with water. The way of flushing fertilization should be used in a timely and appropriate amount, mainly for topdressing in intensive vegetable cultivation, mainly applying nitrogen and potassium; there are several fertilizers not to be applied, one is not to apply phosphorus, the second is not to apply granular compound fertilizer, the third is not to apply solid organic fertilizer, and the fourth is not to apply microbiological agents or fertilizers. Get more water-soluble fertilizer application technology