Too much nitrogen fertilizer in vegetables poses a serious threat to people's health. Nitrate in vegetables with too much nitrogen fertilizer is 20-40 times normal. Nitrate is converted to nitrite during human body or vegetable transportation and storage. Nitrite is combined with various amines in the human body to produce a strong carcinogen, ammonium nitrite.
Excessive application of nitrogen fertilizer also causes serious soil and water pollution. The long-term large-scale application of nitrogen fertilizers, especially ammonium sulfate, ammonium chloride, etc. will gradually acidify the soil. Residual toxic substances such as sulfate, chloride ions and biuret in urea will gradually reduce the amount of microorganisms and earthworms in the soil. The acidification of the soil also accelerates the leaching of nutrients in the soil, eventually composting the soil and losing the value of cultivation.
Vegetables should pay attention to control nitrogen fertilizer. When nitrogen fertilizer is applied, it should be measured in order to prevent overdosing. Non-pollution vegetable cultivation shall use nitrate fertilizer and compound fertilizer produced from nitrate nitrogen as raw material. Using scientific fertilization methods, the base fertilizer is mainly organic fertilizer, combined with the application of phosphorus and potassium fertilizers. Top dressing should be top-dressed according to the different growth stages of the vegetables and the amount of fertilizer required. Note that basal fertilizer should be applied in layers, deep, or furrowed. Foliage spray or combined with water top dressing. Promote organic fertilizers and reduce nitrogen fertilizers. It is necessary to make full use of high-quality livestock and animal manures that are fully decomposed, and to use human waste properly. The manure must be processed through accumulation, full fermentation, etc. The human waste should be set up for septic tank storage and fermentation, and add 3%-5% superphosphate and gypsum powder to reduce the volatilization and loss of ammonia.
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