Safe and Efficient Fertilization Precautions for Vegetables

Safe and Efficient Fertilization Precautions for Vegetables

1, leaf vegetable vegetables avoid application of ammonium nitrate. Leaf vegetables, such as cabbage, Chinese cabbage, leeks, celery, cabbage, etc., can easily absorb nitric acid nitrogen fertilizer during growth. Leafy vegetables If ammonium nitrate is used, leafy vegetables absorb nitrate ions. When consumers consume leafy vegetables that use ammonium nitrate, salt ions will enter the consumer, resulting in chronic savings. Sexual poisoning.

2, avoid leaf spray high nitrogen fertilizer. If urea, thiamin, etc., are used to spray fertilizer on vegetable leaves, although the color of green leaves may be green, the content of harmful salts in vegetables will be significantly increased, thus affecting the health of consumers. Therefore, leafy vegetables should be prohibited from spraying high concentrations of nitrogen fertilizer.

3. Avoid high-strength ammonium nitrogen fertilizer in greenhouses. Due to the high temperature and high humidity in the greenhouse, high-concentration ammonium nitrogen fertilizer can easily be decomposed under the action of soil enzymes under suitable temperature and humidity conditions, and converted into gaseous ammonia. It is easy to cause vegetable poisoning, reduce the yield and quality of vegetables, and even cause vegetable poisoning death in severe cases.

High-efficiency fertilization precautions for vegetables

1, avoid repeated application of thiamine. In a vegetable field with acidic or calcareous soils, if thiamine is applied multiple times in succession, the soil will become more acidic and the calcareous soil will appear to be compacted, resulting in poor growth and development of vegetables, impaired absorption of nutrients, and deterioration of quality. Reduced efficiency.

2, avoid using water after urea. The nitrogen component contained in urea is amide nitrogen. Amido nitrogen can only be absorbed by vegetable roots after being converted into ammonium sulfate or ammonium bicarbonate under the action of urease secreted by soil microorganisms. If urea is used immediately after watering or raining, amide nitrogen will be lost. Therefore, urea, whether it is used as a base fertilizer or top dressing of vegetables, should be used for 5 to 6 days after application, so that it can be transformed and then watered to avoid loss of nitrogen.

3, avoid water shortage application of ammonium bicarbonate. The chemical properties of ammonium bicarbonate are extremely unstable and it is easy to volatilize and dissipate. Therefore, in the application of ammonium bicarbonate in vegetable fields, regardless of whether it is used as base fertilizer or top dressing, deep application should be carried out in the case of wet vegetable fields, and the soil should be covered immediately after application so as to avoid loss of fertilizer effect. (Xue Yuhua)

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