What should we pay attention to when using flushing fertilizer?

What should we pay attention to when using flushing fertilizer? Please introduce Flushing Fertilizer which is a way of topdressing. It is also called Water Flushing Fertilizer, that is, it dissolves solid quick-acting chemical fertilizer in water and carries fertilizer with water. Flushing fertilization usually uses water-soluble chemical fertilizers, mainly nitrogen and potassium, which are highly water-soluble. Through the combination of fertilizer and water, soluble nitrogen and potassium can infiltrate into the soil and be absorbed by crop roots. Irrigation and fertilization is widely used in greenhouse and open field vegetables, mainly in the period of vigorous growth of vegetables, such as the full fruit period of fruits and vegetables, the heart stage of Chinese cabbage after each picking, and so on. Due to the quick effect of flushing fertilization, the general fertilizer can be effective two days after application. Therefore, it has been adopted by many vegetable farmers in recent years. The purpose of fertilization is not only for the high yield of crops, but also pay attention to the comprehensive benefits, so it is necessary to master the technical essentials of flushing fertilization. First of all, the type of fertilizer for irrigation and fertilization should be selected correctly. Only water-soluble fertilizer can be applied with water. Urea, ammonia, ammonium sulfate and ammonium nitrate are commonly used in nitrogen fertilizer, potassium chloride and potassium sulfate are commonly used in potash fertilizer, and potassium nitrate can also be used in potash fertilizer. In phosphate fertilizer, even the water-soluble ammonium dihydrogen phosphate and diammonium hydrogen phosphate should not be flushed, because the mobility of phosphate fertilizer is very poor after dissolution, it is easy to be fixed, and can not infiltrate into the root layer with water. Therefore, the application of phosphate fertilizer is best buried in the soil layer by layer in order to improve its utilization rate. The nutrient content of a single irrigation fertilization must be standardized, and the amount of pure nitrogen per mu in high-yield cultivation of vegetables should be controlled at 2kg / mu, especially nitrate nitrogen should be controlled at 2kg / mu. The limited amount of potassium (potassium oxide) is generally 2kg / mu. Otherwise, the waste and loss of nutrients will not only reduce the utilization rate of fertilizer, but also cause pollution to water quality. In the control of irrigation quantity, it is necessary to prevent flood irrigation in border irrigation; in canal irrigation, the ditch depth adapts to the amount of water to prevent the loss of nutrients dissolved in water with water. In addition, granular compound fertilizer, solid organic fertilizer, microbial preparation or fertilizer should not be flushed. Get more water-soluble fertilizer application technology