Vegetable fields should reduce the amount of fertilizer used
2022-08-27 09:04:13
According to the survey, although the use of chemical fertilizers in vegetable fields has decreased slightly, the amount of chemical fertilizer used per mu of vegetable fields is still more than 200 kg per year, reaching 250 kg. This is very unfavorable for the production of safe and healthy vegetables and improving the quality of vegetables, affecting people's health. . To this end, while vigorously promoting the application of commercial organic fertilizers, the use of chemical fertilizers in vegetable fields should be reduced, so that the annual use of chemical fertilizers per mu is controlled below 150 kg. The excessive use of chemical fertilizers in vegetable fields has the following disadvantages:
1. Increase the nitrate content of the soil. Vegetable crops have the largest demand for nitrogen fertilizer, but excessive use of nitrogenous fertilizers increases the nitrate content in the soil. The nitrogen absorbed by the vegetable roots from the soil is mainly nitrate nitrogen and ammonium nitrogen, which makes the nitrate content in vegetable products. Increase. The main channel for human intake of nitrate is diet. 70-80% of it comes from vegetables. Nitrate is easily reduced to nitrite by microbial action in the human body. It can combine with nitrogenous compounds in the stomach to form carcinogen nitrosamine. Therefore, the most effective way to reduce the content of nitrate in vegetables is to reduce the amount of fertilizer used.
2, salt damage. Most of the chemical fertilizers are composed of various kinds of salt. In the protected environment, due to the lack of rainwater, the application of excessive chemical fertilizers will increase the accumulation of soil salinity, increase the concentration of soil solution, and absorb water from vegetables. Difficulties, not only can the seeds not germinate or delay germination, but also make the growing vegetables unable to absorb water or absorb water, forming a physiological drought state, vegetable physiological disorders, slow growth, and even death, which is the secondary salinization damage of the soil.
In addition, excessive use of chemical fertilizers in vegetable fields can not absorb crops, pollute the environment, and increase agricultural costs.
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1. Increase the nitrate content of the soil. Vegetable crops have the largest demand for nitrogen fertilizer, but excessive use of nitrogenous fertilizers increases the nitrate content in the soil. The nitrogen absorbed by the vegetable roots from the soil is mainly nitrate nitrogen and ammonium nitrogen, which makes the nitrate content in vegetable products. Increase. The main channel for human intake of nitrate is diet. 70-80% of it comes from vegetables. Nitrate is easily reduced to nitrite by microbial action in the human body. It can combine with nitrogenous compounds in the stomach to form carcinogen nitrosamine. Therefore, the most effective way to reduce the content of nitrate in vegetables is to reduce the amount of fertilizer used.
2, salt damage. Most of the chemical fertilizers are composed of various kinds of salt. In the protected environment, due to the lack of rainwater, the application of excessive chemical fertilizers will increase the accumulation of soil salinity, increase the concentration of soil solution, and absorb water from vegetables. Difficulties, not only can the seeds not germinate or delay germination, but also make the growing vegetables unable to absorb water or absorb water, forming a physiological drought state, vegetable physiological disorders, slow growth, and even death, which is the secondary salinization damage of the soil.
In addition, excessive use of chemical fertilizers in vegetable fields can not absorb crops, pollute the environment, and increase agricultural costs.
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