The fertilization of green vegetables is mainly based on the improvement of soil fertility by organic fertilizers, but can green vegetables really not be applied?
Green food and fertilizer application are not contradictory
Do not oppose green foods with chemical fertilizers. Chemical nitrogen fertilizers are inorganic nitrogen sources that can be directly absorbed by vegetables. Organic fertilizers are decomposed by microorganisms to convert organic nitrogen into inorganic nitrogen. Finally, inorganic nitrogen is used for vegetables. Absorbed. Therefore, the view that "the use of chemical fertilizer vegetables is not a green food standard" is not correct.
Appropriate control of nitrogen fertilizer use
In order to ensure that the green food standard vegetables have good yield and economic benefits, on the basis of the application of organic fertilizers, the necessary application of nitrogen fertilizer is necessary, but the dosage must be controlled. In the current situation that green food and vegetables are not based on quality, it is difficult to solve the contradiction between quality and output, yield and benefit without applying chemical nitrogen fertilizer.
Strictly master the time of topdressing of nitrogen fertilizer
The nitrate content of vegetable crops is constantly changing. Because the nitrogen that enters the vegetable body is further converted into amino acids and synthesized in the metabolic process. According to the research, with the passage of nitrogen fertilizer, the nitrate content in vegetables has gradually decreased. Therefore, from the safety point of view, the topdressing time of green food vegetables should be 15-20 days before harvesting. In addition, nitrogen fertilizer combined with potassium fertilizer can promote protein synthesis and reduce nitrate content in the body.
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