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Medical research and clinical practice have confirmed that nitrate and nitrite are closely related to the formation of carcinogenic nitrosamines. Regular consumption of vegetables with excessive nitrate and nitrite content can cause chronic poisoning and can induce diseases such as esophageal cancer and gastric cancer. Therefore, the World Health Organization stipulates that nitrate is found in every kilogram of vegetables. The content of nitrite is not more than 4.32 mg and 15.6 mg, respectively. The results of the detection of vegetables by local environmental protection departments are: Many vegetables are generally exceeding the standard.
Why are there too much nitrate and nitrite in vegetables? The main reason is the large amount of chemical nitrogen fertilizer applied. Among the vegetables, especially cabbage, spinach, lettuce, leeks, lotus roots and other varieties are likely to accumulate large amounts of nitrates and nitrites. Vegetable farmers must use nitrate-nitrogen fertilizers in fertilization. Even for other vegetable varieties, chemical nitrogen fertilizer should be used less, and it is necessary to apply more organic fertilizer and less chemical nitrogen fertilizer. In particular, do not apply surface, shallow application, or spray chemical nitrogen fertilizer on the foliage. Under the conditions of surface application, shallow application and foliar application, the nitrogen fertilizer is in contact with air and aerobic microorganisms. Not only the nitrate of nitrate nitrogen fertilizer will be absorbed by vegetables, but even the ammonium ions of ammonium nitrogen fertilizer and amide nitrogen fertilizer have oxygen and good gas. Under the action of bacteria, it is also oxidized to nitrate ions, which makes the nitrate content in vegetables exceed the standard.
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four wires three circult track lighting systems
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Accessories are available for suspended mounting.
Vegetables with less chemical nitrogen fertilizer
At present, due to the large-scale use of chemical nitrogen fertilizer on vegetables, the nitrate and nitrite content exceeds the standard, affecting the health of the consumers and even causing life-threatening. This evil fruit has not yet attracted people's attention.
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