First, leafy vegetables do not apply ammonium nitrate Chinese cabbage, Chinese cabbage, leeks, hollow beans, celery, cabbage, etc., easy to absorb nitrate nitrogen fertilizer during growth, such as the application of ammonium nitrate. Leafy vegetables absorb nitrate ions. After consumption, nitrate ions will enter the human body and human body volume is poisoned.
Second, vegetables should not be used after the application of urea, the nitrogen content in the urea is ammonium amide, the ammonium amide in the soil microbial secretion of urease, converted to ammonium carbonate or ammonium bicarbonate before being vegetables Root absorption and utilization. If the urea is immediately watered or exposed to rain, the nitrogen in the ammonium amide state will be lost. Therefore, whether urea is used as the base fertilizer or top dressing of vegetables, it should be 5-6 days after application. Allow it to be completely converted and then watered to avoid loss.
3. Do not apply ammonium sulfate repeatedly in vegetable fields in acid soil or calcareous soil. If ammonium sulphate is applied several times in succession, the soil will become more acidic, causing the calcareous soil to stagnate, resulting in poor growth and development of vegetables, and a decrease in quality and yield. Reduce the economic benefits of cultivation.
4. Do not apply ammonium bicarbonate when the vegetable field is short of water. The ammonium bicarbonate is chemically unstable and volatile. When applying ammonium bicarbonate in vegetable fields, it is used as a base fertilizer or as a top dressing. All should be carried out in the case of wet vegetable fields, and the soil should be covered immediately after application. If the weather is dry and carbon ammonium is not applied, it can be poured or watered.
5. Leafy vegetables should not be sprayed with high-concentration nitrogen fertilizer. If urea, ammonium sulfate, etc. are used for vegetable leaf surface spraying, although the vegetable leaves are green and good in color, the content of harmful salts in green leafy vegetables is Will increase significantly, which in turn affects the health of consumers.
6. Do not use ammonium nitrate fertilizer with high concentration in greenhouse. Because of the high temperature and humidity in the greenhouse. The high concentration of ammonium nitrogen fertilizer is easily decomposed under the action of soil enzyme under suitable temperature and humidity conditions, and finally converted into gaseous ammonia, which will lead to ammonia poisoning in vegetables. Affect the quality and yield of vegetables.
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