Q: What are the specific requirements for pollution-free vegetables?
A: The quality of high-quality vegetables generally includes three aspects: nutrition quality, hygiene quality and product quality. They are not only an important basis for comprehensive evaluation of the quality of vegetables, but also an important embodiment of the value of vegetable products. The hygienic quality of vegetables is also called safety quality. It mainly refers to the degree of chemical and biological pollution of vegetables. Solving these problems is the minimum requirement for the production of pollution-free vegetables.
Q: How to produce pollution-free vegetables from the perspective of fertilization?
Answer: Specifically, there are three fertilization strategies for producing pollution-free vegetables. Reduce the nitrate content of commercial vegetables; prevent the pollution of heavy metal on vegetable products; prevent the biological pollution of commercial vegetables.
First of all, the nitrate content in commercial dishes. 80% of the nitrates consumed by the human body come from vegetables. The level of nitrate in vegetables is closely related to human health. Therefore, it is an important symbol of the quality of vegetables. This is because nitrates can form nitrous acid under reducing conditions, and nitrites combine with amines to form nitrosamines. Nitrosamine is a very carcinogenic substance.
Question: Now the state tests the nitrate content of commercial vegetables. What measures should farmers take in production?
Answer: The specific fertilization measures include the following aspects: economic and reasonable application of nitrogen fertilizer; promotion of balanced fertilization techniques to increase potash fertilizer; strict implementation of nitrogen fertilizer safety interval.
As long as these measures are implemented, the nitrate content of commodities can be significantly reduced without exceeding the standard.
Q: How do farmers' friends manage the safety interval of nitrogen fertilizer application?
Answer: Studies have shown that the nitrate content in vegetables is generally larger in the early growth stage than in the late growth stage or mature stage. The earlier the vegetables are harvested, the higher the nitrate content in the body. Therefore, under the premise of ensuring product quality and transportation quality, appropriate delay in harvesting will help reduce the nitrate content of vegetables. In particular, the length of time between topdressing of nitrogen fertilizers and harvesting time of vegetables has a great influence on the nitrate content of vegetables. Some studies suggest that the period of vegetable market is about 8 days after topdressing nitrogen fertilizer. This is because the nitrogen absorbed by vegetables, whether it is ammonium or nitrate nitrogen, requires a conversion time. When they form amino acids and proteins, the nitrate content in the body will naturally drop.
Expert Tips:
There is a direct relationship between excess nitrate and excess nitrogen fertilizer in commercial vegetables.
Promoting balanced fertilization will help reduce nitrate content in vegetables.
Reduce the nitrate content of commercial dishes. In addition to the rational application of nitrogen fertilizers, it is very important to strictly enforce the safety interval of nitrogen fertilizer application (generally about 8 days). (Chen Lun-Shou)
A: The quality of high-quality vegetables generally includes three aspects: nutrition quality, hygiene quality and product quality. They are not only an important basis for comprehensive evaluation of the quality of vegetables, but also an important embodiment of the value of vegetable products. The hygienic quality of vegetables is also called safety quality. It mainly refers to the degree of chemical and biological pollution of vegetables. Solving these problems is the minimum requirement for the production of pollution-free vegetables.
Q: How to produce pollution-free vegetables from the perspective of fertilization?
Answer: Specifically, there are three fertilization strategies for producing pollution-free vegetables. Reduce the nitrate content of commercial vegetables; prevent the pollution of heavy metal on vegetable products; prevent the biological pollution of commercial vegetables.
First of all, the nitrate content in commercial dishes. 80% of the nitrates consumed by the human body come from vegetables. The level of nitrate in vegetables is closely related to human health. Therefore, it is an important symbol of the quality of vegetables. This is because nitrates can form nitrous acid under reducing conditions, and nitrites combine with amines to form nitrosamines. Nitrosamine is a very carcinogenic substance.
Question: Now the state tests the nitrate content of commercial vegetables. What measures should farmers take in production?
Answer: The specific fertilization measures include the following aspects: economic and reasonable application of nitrogen fertilizer; promotion of balanced fertilization techniques to increase potash fertilizer; strict implementation of nitrogen fertilizer safety interval.
As long as these measures are implemented, the nitrate content of commodities can be significantly reduced without exceeding the standard.
Q: How do farmers' friends manage the safety interval of nitrogen fertilizer application?
Answer: Studies have shown that the nitrate content in vegetables is generally larger in the early growth stage than in the late growth stage or mature stage. The earlier the vegetables are harvested, the higher the nitrate content in the body. Therefore, under the premise of ensuring product quality and transportation quality, appropriate delay in harvesting will help reduce the nitrate content of vegetables. In particular, the length of time between topdressing of nitrogen fertilizers and harvesting time of vegetables has a great influence on the nitrate content of vegetables. Some studies suggest that the period of vegetable market is about 8 days after topdressing nitrogen fertilizer. This is because the nitrogen absorbed by vegetables, whether it is ammonium or nitrate nitrogen, requires a conversion time. When they form amino acids and proteins, the nitrate content in the body will naturally drop.
Expert Tips:
There is a direct relationship between excess nitrate and excess nitrogen fertilizer in commercial vegetables.
Promoting balanced fertilization will help reduce nitrate content in vegetables.
Reduce the nitrate content of commercial dishes. In addition to the rational application of nitrogen fertilizers, it is very important to strictly enforce the safety interval of nitrogen fertilizer application (generally about 8 days). (Chen Lun-Shou)
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