To ensure the safety of vegetable production, there must be a "four bogey" concept in the fertilization process. 1. Avoid application of nitrate nitrogen Fertilizer. After applying nitrate-nitrogen fertilizer to vegetables, the nitrate content in vegetables will increase exponentially. Vegetables with high nitrate content are easily degraded by human hemoglobin after being eaten by humans, causing hypoxia in brain, heart and other organs. Therefore, the application of nitrate nitrogen fertilizer in vegetable cultivation, you can choose to apply ammonium nitrogen fertilizer. 2. Avoid applying chlorine fertilizer. In the vegetable field, chlorine-containing fertilizers are used. When ammonium, potassium, or other ions are absorbed by the soil or absorbed by crops, the chloride ions will remain in the soil. When the concentration reaches a certain level, it will poison the roots of the crops, reduce the starch and sugar content of the vegetables, and even lead to plant death. 3. Avoid application of fresh manure. Fresh manure without complications contains Ascaris eggs. Ascaris eggs have a strong ability to live in the outside world, and generally survive for 3 to 6 months. When people consume vegetables contaminated with roundworms, they become infected with tsutsugamushi disease. Therefore, human fecal urine is subjected to high temperature stuffing before it is applied, so that it fully decomposes. 4. Avoid drought and fertilization. The vegetable is a favorite fertilizer crop. When the soil is dry, fertilization can not only exert its full effect, but also the burning of the root can be caused when the soil solution concentration suddenly increases. Among the numerous vegetable topdressing techniques, foliar dressing is an economical, quick-impact, high-yield, and quality-enhancing cultivation technique for vegetable production. It promotes vigorous vegetable growth, prevents premature aging, and prolongs growth. In production, suitable fertilizers are selected according to the different growth stages of different types of vegetables. Fruits, melons, and legumes should be topdressed with phosphate, potash, zinc, and molybdenum fertilizers during the seedling development period. Potatoes and vegetables should be sprayed with fertilizers rich in phosphorus and potassium during foliar application. Leafy vegetables should be topdressed with suitable fertilizers containing high amounts of nitrogen at suitable time in the whole growing period. In terms of concentration and use. The concentration of sprayed fertilizer should be light in the early stage and thick in the middle and late stages; the amount of mu should be less in the early stage and more in the middle and later stages. At the same time, foliar sprays should be carried out on sunny days without wind.
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