Green vegetable fertilization
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Nitrogen fertilizer is an inorganic nitrogen source that can be directly absorbed by vegetables. Organic fertilizers can be converted into inorganic nitrogen by microbial decomposition, and finally inorganic nitrogen is used for vegetable absorption. Therefore, as long as the chemical fertilizer application technology is based on the organic fertilizer to improve the soil fertility level, insert the legume crop to increase the soil nitrogen content, reduce the chemical nitrogen fertilizer dosage, strictly control the nitrogen fertilizer top dressing time, control the nitrate content of the vegetable body, Produce high quality green vegetables.
Technically speaking, green vegetable fertilization should master the following points:
Control the amount of nitrogen fertilizer. In order to ensure that green vegetables have good yield and economic benefits, it is necessary to apply nitrogen fertilizer on the basis of applying organic fertilizer, but it is necessary to control the dosage to solve the contradiction between quality and yield, yield and benefit. At the same time, pay attention to the choice of nitrogen fertilizer varieties, the accumulation of nitrate in vegetables is reduced by the influence of sodium nitrate, ammonium nitrate, urea, ammonium chloride.
Strictly grasp the time of topdressing of nitrogen fertilizer. The nitrate content of vegetable crops is constantly changing. Nitrogen entering the vegetable body is further converted into protein during metabolism. According to the research, with the change of nitrogen fertilizer application time, the nitrate content in vegetables has gradually decreased. After 18 days of topdressing, the nitrate content in the vegetables has met the recommended standards for green food. Therefore, the top dressing time of green vegetables should be 15-20 days before harvesting.
Balance fertilization. The application of various fertilizers is easier than the single application of nitrogen fertilizer to reduce the nitrate content in the vegetables. Nitrogen and phosphorus combined with spraying micro-fertilizer can reduce the content of nitrate in vegetables, especially with potassium fertilizer, which can promote protein synthesis and reduce nitrate content in the body.
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