Rational fertilization can control nitrate content in vegetables

Vegetables are indispensable important foods in people's daily lives. Studies have shown that about 70%-80% of the nitrates ingested by humans come from vegetables. The nitrates ingested by the human body can be reduced to nitrite by the action of microorganisms, and the nitrite forms a strong carcinogen, nitrosamine, in the stomach cavity, thereby inducing cancer of the digestive system.

To reduce the accumulation of nitrate in vegetables, fertilization technology is the key, including reasonable fertilizer varieties, nitrogen, phosphorus, potassium and medium and trace elements ratio, suitable fertilization period and method, organic fertilizer and fertilizer combination.

1. Organic fertilizer combined with chemical fertilizer application of organic fertilizer is an important measure to reduce nitrate accumulation in vegetables and improve the nutritional value of the product. The application of nitrogen fertilizer with manure and soil fertilizers makes the ratio of inorganic nitrogen to organic nitrogen reach 1:1. Effectively control and reduce the accumulation of nitrate in vegetables.

2. Select the appropriate nitrogen fertilizer type, form and dosage. Nitrogen fertilizer should be applied in combination with urea, ammonium chloride or nitrate nitrogen fertilizer in the ratio of 3:7. Short-season vegetables will be applied with 10 kg of pure nitrogen in the whole growth period, and 15 kg of pure nitrogen will be applied in the whole growing period of the long-term vegetables.

3, the use of scientific topdressing method for the shorter growth period of vegetables, the use of base fertilizer once applied. Long-season vegetables 70% nitrogen fertilizer, organic fertilizer, phosphorus and potassium fertilizer as base fertilizer, 30% nitrogen fertilizer for topdressing, is conducive to restrict the accumulation of nitrate in vegetables in the later period.

4. In combination with nitrogen fertilizer inhibitors, nitrogen inhibitors such as nitropyrazine and dicyandiamide are used to inhibit the activity of soil nitrifying bacteria, thereby reducing the accumulation of nitrate in soil and vegetables.

5. Foliar application of trace elements and Other chemical substances The nitrate content of vegetables decreases with the increase of molybdenum fertilizer dosage. The nitrate content in the leaves of molybdenum-sprayed vegetables decreased by 41%-76%. The application of trace element fertilizers such as molybdenum and manganese to the roots activates the nitrate reductase of the leaves, which can reduce the nitrate content in the plants. In addition, spraying with oxalic acid, glycine, etc. one day before harvest can significantly reduce the nitrate content in vegetables. (China Planting Technology Network)

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