1, avoid applying ammonium nitrate
Leafy vegetables such as Chinese cabbage, Chinese cabbage, leeks, spinach, celery, cabbage, etc., easily absorb nitrate nitrogen fertilizer during growth. For example, when applying ammonium nitrate, leafy vegetables absorb nitrate ions, which will cause nitrates in vegetables to exceed the standard.
2, avoid applying urea after watering
The nitrogen component contained in urea is an amido ammonium. The ammonium amide is converted into ammonium carbonate or ammonium hydrogencarbonate by the urease secreted by soil microorganisms before being absorbed and utilized by vegetable roots. If the urea is immediately watered or exposed to rain, the ammonium 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 5~6d after application, so that it can be completely converted and then watered to avoid loss.
3, avoid repeated application of ammonium sulfate
In the vegetable fields of acid soil or calcareous soil, if the application of ammonium sulfate is repeated several times, the soil will become more acidic, causing the calcareous soil to be squashed, leading to poor growth and development of vegetables, degraded quality and reducing the economic benefits of vegetables. .
4, avoid water shortage application of ammonium bicarbonate
The chemical properties of ammonium bicarbonate are extremely unstable and easily volatilized. 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 soil should be covered immediately after application.
5, use high concentration of nitrogen fertilizer with caution
If the vegetable leaves are sprayed with urea, ammonium sulfate, etc., although the vegetable leaves are green and have good color, the content of harmful salts in the green leafy vegetables will increase significantly, thus affecting the health of consumers.
6. Use high concentration ammonium nitrogen fertilizer with caution
Due to the high temperature and high 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 of vegetables and affect vegetables. Yield and quality.
Leafy vegetables such as Chinese cabbage, Chinese cabbage, leeks, spinach, celery, cabbage, etc., easily absorb nitrate nitrogen fertilizer during growth. For example, when applying ammonium nitrate, leafy vegetables absorb nitrate ions, which will cause nitrates in vegetables to exceed the standard.
2, avoid applying urea after watering
The nitrogen component contained in urea is an amido ammonium. The ammonium amide is converted into ammonium carbonate or ammonium hydrogencarbonate by the urease secreted by soil microorganisms before being absorbed and utilized by vegetable roots. If the urea is immediately watered or exposed to rain, the ammonium 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 5~6d after application, so that it can be completely converted and then watered to avoid loss.
3, avoid repeated application of ammonium sulfate
In the vegetable fields of acid soil or calcareous soil, if the application of ammonium sulfate is repeated several times, the soil will become more acidic, causing the calcareous soil to be squashed, leading to poor growth and development of vegetables, degraded quality and reducing the economic benefits of vegetables. .
4, avoid water shortage application of ammonium bicarbonate
The chemical properties of ammonium bicarbonate are extremely unstable and easily volatilized. 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 soil should be covered immediately after application.
5, use high concentration of nitrogen fertilizer with caution
If the vegetable leaves are sprayed with urea, ammonium sulfate, etc., although the vegetable leaves are green and have good color, the content of harmful salts in the green leafy vegetables will increase significantly, thus affecting the health of consumers.
6. Use high concentration ammonium nitrogen fertilizer with caution
Due to the high temperature and high 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 of vegetables and affect vegetables. Yield and quality.
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