In the production of pollution-free vegetables, the types and types of fertilizers that can be used are: 1. High-quality organic fertilizers. Such as compost, manure, biogas fertilizer, green manure, crop straw, mud, cake fat and so on. Must be fully cooked before application. 2, biological bacteria fertilizer. Including humic acid fertilizers, rhizobia fertilizers, phosphorus bacteria fertilizers, composite microbial fertilizers and so on. 3, inorganic fertilizers. Such as ammonium sulfate, urea, calcium superphosphate, potassium sulfate and other nitrogen, phosphorus and potassium fertilizers that do not contain chlorine and nitrate nitrogen, as well as vegetable-specific fertilizers produced throughout the country. 4, trace element fertilizer. That is, copper, iron, boron, zinc, manganese, molybdenum and other trace elements and beneficial elements as the main fertilizer. 5, other fertilizers. Such as bone meal, amino acid residues, sugar factory waste. In order to reduce pollution and give full play to the fertilizer effect, balanced soil fertilization should be implemented, specifically including the type and amount of fertilizer; the proportion of base fertilizer and top dressing; the frequency and time of top dressing; and the method of fertilization according to fertilizer characteristics. Formula fertilization is the basic fertilization technique for the production of pollution-free vegetables. In the implementation of chemical fertilizers and vegetable special fertilizers, it is necessary to deepen and apply early. Deep application can reduce the volatilization of nutrients. Generally, ammonium nitrogen is applied to the upper layer of 6 cm or less, urea is applied to the upper layer of 10 cm or less, and phosphorus and potassium fertilizers are applied to soil layers below 15 cm. Special fertilizer for vegetables is applied to the soil below 15 cm. Different types of vegetables, there is a great difference in the degree of nitrate accumulation, leafy vegetables are generally higher than vegetables, vegetables higher than fruit vegetables. In addition, the nitrate content of the same vegetable under different climatic conditions is also different. Under normal high temperature and strong light, the accumulation of nitrate is less. China Agricultural Network Editor
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