1, leafy vegetables do not apply ammonium nitrate. Leafy vegetables, such as Chinese cabbage, Chinese cabbage, leeks, celery, cabbage, etc., easily absorb nitrate nitrogen fertilizer during growth. If leafy vegetables are applied with ammonium nitrate, leafy vegetables absorb nitrate ions. Consumers eat leafy vegetables that use ammonium nitrate, and salt ions will enter the consumer, resulting in chronic savings. Sexual poisoning.
2, avoid foliar spray high concentration of nitrogen fertilizer. If the vegetable foliar spray is used with urea, thiamine, etc., although the vegetable leaves are colored green, the content of harmful salts in the vegetables is significantly increased, thereby affecting the health of the consumer. Therefore, leafy vegetables should be prohibited from spraying high concentrations of nitrogen fertilizer.
3, the shed indoors avoid high-concentration ammonium nitrogen fertilizer. Due to the high temperature and high humidity in the shed, the high-concentration ammonium nitrogen fertilizer is easily decomposed under the action of soil enzyme under suitable temperature and humidity conditions, and is converted into gaseous ammonia, which is extremely stable under the conditions of greenhouse closure. It is easy to cause vegetable poisoning, reduce the yield and quality of vegetables, and even cause vegetable poisoning death in severe cases.
Precautions for efficient fertilization of vegetables
1. Avoid repeated administration of thiamine. In the vegetable field of acid soil or calcareous soil, if the thiamine is applied several times in succession, the soil will become more acidic, causing the calcareous soil to be squashed, leading to poor growth and development of vegetables, hindered absorption of nutrients, and degraded quality. The benefits are reduced.
2, avoid applying urea after watering. The nitrogen component contained in urea is an amide nitrogen. The amide nitrogen can be absorbed and utilized by vegetable roots after being converted into ammonium sulfate or ammonium hydrogencarbonate by urease secreted by soil microorganisms. If water is applied or rained immediately after urea application, the amide nitrogen is lost. Therefore, whether urea is used as the base fertilizer or top dressing of vegetables, it should be re-watered after 5~6 days after application, so as to avoid nitrogen loss. Agricultural Technology
3, avoid the use of carbon ammonium in water shortage. The chemical nature of ammonium bicarbonate is extremely unstable and is easily lost. Therefore, when applying ammonium bicarbonate in vegetable fields, whether it is 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 to avoid the loss of fertilizer effect.
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