At present, pollution-free cultivation has become a general trend. The use of low-toxicity pesticides in vegetables has become a consensus, but vegetable farmers rarely associate the fertilization of vegetables with the sanitary quality of vegetables.
In fact, the excessive application of nitrogenous 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 combines with various amines in the human body to produce a strong carcinogen, nitrite amine.
Excessive application of nitrogen fertilizer also causes serious soil and water pollution. The long-term large-scale application of nitrogen fertilizers, especially ammonium sulfate, chlorination, 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. Pollution-free cultivation of vegetables should be banned on nitrate-N fertilizers and compound fertilizers produced from nitrate-N fertilizers. The method of scientific fertilization is adopted: Basal manure is mainly organic fertilizer, combined with application of phosphorus and potassium fertilizers. Fertilizers should be top-dressed in a timely manner according to the amount of fertilizer needed in different fertility stages of vegetables. 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 by accumulation, full fermentation, etc. It can also be fermented by biogas at high temperature. Human fecal urine should be set up for septic tank storage fermentation, and 3-5% superphosphate and gypsum powder to reduce the volatilization and loss of ammonia.
In fact, the excessive application of nitrogenous 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 combines with various amines in the human body to produce a strong carcinogen, nitrite amine.
Excessive application of nitrogen fertilizer also causes serious soil and water pollution. The long-term large-scale application of nitrogen fertilizers, especially ammonium sulfate, chlorination, 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. Pollution-free cultivation of vegetables should be banned on nitrate-N fertilizers and compound fertilizers produced from nitrate-N fertilizers. The method of scientific fertilization is adopted: Basal manure is mainly organic fertilizer, combined with application of phosphorus and potassium fertilizers. Fertilizers should be top-dressed in a timely manner according to the amount of fertilizer needed in different fertility stages of vegetables. 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 by accumulation, full fermentation, etc. It can also be fermented by biogas at high temperature. Human fecal urine should be set up for septic tank storage fermentation, and 3-5% superphosphate and gypsum powder to reduce the volatilization and loss of ammonia.
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