Fertilization principles for green vegetables

In order to ensure the high yield and economic benefits of green vegetables, the application of nitrogen fertilizers is necessary based on the application of organic fertilizers, but the use of nitrogen fertilizers must be controlled to resolve the contradiction between quality and yield, yield and benefits . At the same time, pay attention to the choice of nitrogen fertilizer varieties. The accumulation of nitrate in vegetables decreases with the influence of sodium nitrate, ammonium nitrate, urea, and ammonium chloride.

Balanced fertilization combined with various fertilizers can reduce nitrate content in vegetables more easily than nitrogen fertilizer alone. The combination of nitrogen and phosphorus and spraying of micro-fertilizer can reduce the nitrate content in vegetables, especially with potassium fertilizer, which can promote protein synthesis and reduce nitrate content in the body.

Strictly grasp the topdressing time of nitrogen fertilizer. The nitrate content of vegetable crops is constantly changing. The nitrogen that enters the vegetable body is further converted into protein during the metabolic process. According to research, with the application of nitrogen fertilizer, the nitrate content in vegetables has a tendency to gradually decrease. After 18 days of fertilization, the nitrate content in vegetables has met the recommended standards for green food. Therefore, the topdressing time for green vegetables should be 15 to 20 days before harvest.

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