According to Director Zhang, at present, some vegetable farmers in our province tend to pay attention to the amount of nitrogen fertilizer applied in vegetable production, while ignoring the application rate of organic fertilizer, which seriously affects the quality of vegetables. Therefore, it is necessary to appeal to vegetable growers. In order to ensure the health of consumers, it is necessary to strictly control the amount of nitrogen fertilizer applied to vegetables and increase the application of organic fertilizer to ensure the quality of vegetables.
The application rate of nitrogen fertilizer on vegetables is limited. It is not the more the application, the better. When it exceeds a certain amount, it will not only cause the decrease of vegetable yield and quality, but also cause environmental pollution.
The effect of nitrogen application on the quality of vegetables is mainly reflected in the increase of the content of vitamin C and soluble total sugar in vegetables with the increase of nitrogen application rate. Specifically, it is expressed in vegetables. For example, under high nitrogen conditions, the sugar acidity of the fruit is significantly decreased, the palatability is deteriorated, the quality is deteriorated, the soluble solids in the fruit are also decreased, and the fruit is mashed, making the tomato intolerant. Shipped. At the same time, excessive application of nitrogen fertilizer in vegetables will also significantly reduce nutrients such as magnesium in vegetables and their fruits.
It has been reported that excessive application of nitrogen fertilizer can significantly increase the nitrate content in vegetables. Although nitrate is harmless to the vegetables themselves, the nitrite ions that are reduced after the vegetables enter the human body are harmful to the human body. Nitrite is a strong carcinogen, and the World Health Organization and the UN Food and Agriculture Organization regulate the daily intake of nitrates to 3.6 mg/kg body weight. China's nitrate content index for vegetables: the first-class nitrate nitrogen content is 98 mg / kg, allowing raw food; the second-class nitrate nitrogen content is 117 mg / kg, raw food is not suitable, salt, allow cooked food; The nitrate content of the product is 316 mg/kg. It is not suitable for raw food and salt, and it is allowed to be cooked. The nitrate content of the fourth grade is 700 mg/kg, which is the maximum limit for vegetables.
It can be seen that the fertilization of soil testing formula is imperative. In order to ensure the health of consumers, it is necessary to strictly control the amount of nitrogen fertilizer applied to vegetables, increase the application of organic fertilizer, and ensure the quality of vegetables.
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