What is irrigating fertilizer? How did it work?

What is irrigating fertilizer? How did it work? Please introduce "Flushing Fertilizer", also known as Flushing Fertilizer, it is a way of topdressing. Widely used in horticulture, the operation method is to dissolve solid available chemical fertilizer in water and fertilize in the way of water and fertilizer. Flushing fertilization usually uses water-soluble chemical fertilizer, mainly nitrogen fertilizer and potassium fertilizer, both of which are highly water-soluble. Through the combination of fertilizer and water, soluble nitrogen and potassium nutrients infiltrate into the soil and then be absorbed by crop roots. Irrigation is irrigation and fertilization, and irrigation methods can be divided into well irrigation and border irrigation, including drip irrigation and sprinkler irrigation. However, in some places, extensive management uses flood irrigation to apply chemical fertilizer. This fertilization method of flood irrigation highlights the word "flush", which is easy to cause a large amount of nitrogen loss and low water use efficiency at the same time. At present, flushing fertilization is widely used to grow vegetables in greenhouse and open field. As the fertilizer effect of rush fertilization comes quickly, which is very consistent with the psychology of some eager growers, therefore, rush fertilization has developed rapidly in recent years, and there are other cash crops besides vegetables. This has also stimulated a large number of small packages of "ammonium nitrate", "potassium nitrate" and other water-soluble fertilizers have been put on the market. And these small packages of fertilizers are more expensive. When evaluating the application prospect of flushing fertilization, we should first understand the purpose of fertilization in modern agriculture, not only for the high yield of crops, but also from the comprehensive benefits of economic benefits and environmental ecology. For this reason, in order to master the technical essentials of "flushing fertilization", we should pay attention to the following points: first of all, correctly select the kinds of fertilizers for flushing fertilization. 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 2kg / mu, especially the nitrate nitrogen should be controlled below 2kg / mu, and the limited number of potassium fertilizer (potassium oxide) should be controlled at 2kg / mu. Otherwise, the waste and loss of nutrients are 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 massive crop growth. For example, if vegetables are applied in the full fruit period and after picking melons and fruits, or in the heart stage of Chinese cabbage, in autumn vegetable cultivation, the temperature drops, soil mineralization decreases, and vegetable crops are suitable for a large number of growing periods. The control of irrigation quantity. Under border irrigation, flood irrigation is prevented, and in canal irrigation, the ditch depth is suitable to the amount of water, so as to prevent the loss of fertilizer nutrients dissolved in water with water. Although the fertilizer effect of impulse fertilization comes quickly, if we use a large amount of nitrogen fertilizer unilaterally and abuse it in order to pursue the apparent effect, regardless of cost, it will lead to the excessive growth of vegetables, the decline of quality, the decrease of fertilizer use efficiency and the loss of nitrogen. Aggravate the salinization of soil properties. Some people flush unripe insoluble solid organic fertilizers or microbial preparations, which are inappropriate. In a word, the way of flushing fertilization should be used timely and appropriately, mainly for topdressing and topdressing nitrogen and potassium in intensive vegetable cultivation. There are several kinds of fertilizers should not 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 rush microbiological agents. Click to get more water-soluble fertilizer application techniques