Excessive nitrogen fertilizer application affects the quality of vegetables? A few days ago, the reporter consulted Zhang Guangming, director of the Institute of Vegetable Research of Shandong Academy of Agricultural Sciences.
According to Director Zhang, at present, vegetable farmers in our province often pay attention to the amount of nitrogen fertilizer used in vegetable production, while neglecting the application amount of organic fertilizer and seriously affecting the quality of vegetables. Therefore, it is necessary to appeal to vegetable growers to strictly control the amount of nitrogen fertilizer applied to vegetables in order to ensure the health of consumers, and to increase organic fertilizers to ensure the quality of vegetables.
There is a limit to the amount of nitrogen fertilizer applied to vegetables. It is not that the application is as good as possible. When it exceeds a certain amount, it will not only reduce the yield and quality of vegetables, but also cause environmental pollution.
The effect of nitrogen fertilizer application on the quality of vegetables was mainly reflected in the significant decrease in the content of vitamin C and soluble total sugar in vegetables with the increase of nitrogen fertilizer application amount. The specific performance in vegetables, such as tomatoes in high nitrogen conditions, the fruit's sugar acidity decreased significantly, palatability worse, quality deterioration, fruit soluble solids also will fall, the fruit appears broth, so that the tomato intolerance Yun. At the same time, excessive nitrogen fertilizers in vegetables will also significantly reduce the nutrients such as magnesium in vegetables and fruits.
It has been reported that excessive nitrogen fertilizer application can significantly increase the nitrate content in vegetables. Although nitrates are harmless to the vegetables themselves, the nitrite ions that are reduced after the vegetables enter the body are harmful to the human body. Nitrite ion is a kind of strong carcinogen. The daily intake of nitrates by WHO and FAO is 3.6 mg/kg body weight. China's indicator of nitrate content in vegetables: First grade nitrate nitrogen content is
Thus, it is imperative to apply soil testing formula. In order to ensure the health of consumers, we must strictly control the amount of nitrogen fertilizer in vegetables, increase organic fertilizer, and ensure the quality of vegetables.
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