Leafy vegetables should avoid ammonium nitrate: Chinese cabbage, Chinese cabbage, leeks, water spinach, celery, cabbage, etc., it is easy to absorb nitrate nitrogen fertilizer during growth, such as the application of ammonium nitrate, leafy vegetables absorb nitrate ions After the consumer consumes the salt, it will enter the human body, causing the consumer to accumulate poisoning. Vegetables should be treated with urea after watering: the nitrogen content in urea is ammonium amide, and the ammonium amide can be absorbed by vegetable roots after being converted into ammonium carbonate or ammonium hydrogencarbonate by urease secreted by soil microorganisms. use. 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 converted into water after 5 to 6 days after application, so as to avoid loss.
Repeated application of ammonium sulfate in vegetables: In the vegetable fields of acidic 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, resulting in poor growth and deterioration of vegetables. Reduce the economic benefits of vegetables.
Avoid the use of ammonium bicarbonate in the lack of water in the vegetable field: the chemical properties of ammonium bicarbonate are extremely unstable and easy to volatilize. 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. Cover the soil immediately afterwards.
Use high-concentration nitrogen fertilizer with caution: If the vegetable leaves are sprayed with urea, ammonium sulfate, etc., although the vegetable leaves are green and good in color, the content of harmful salts in the green leafy vegetables will increase significantly, thus affecting The health of the consumer.
The high-concentration ammonium nitrogen fertilizer should be used with caution: the greenhouse temperature is high and the humidity is high. The high-concentration 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 the yield and quality of vegetables.
Repeated application of ammonium sulfate in vegetables: In the vegetable fields of acidic 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, resulting in poor growth and deterioration of vegetables. Reduce the economic benefits of vegetables.
Avoid the use of ammonium bicarbonate in the lack of water in the vegetable field: the chemical properties of ammonium bicarbonate are extremely unstable and easy to volatilize. 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. Cover the soil immediately afterwards.
Use high-concentration nitrogen fertilizer with caution: If the vegetable leaves are sprayed with urea, ammonium sulfate, etc., although the vegetable leaves are green and good in color, the content of harmful salts in the green leafy vegetables will increase significantly, thus affecting The health of the consumer.
The high-concentration ammonium nitrogen fertilizer should be used with caution: the greenhouse temperature is high and the humidity is high. The high-concentration 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 the yield and quality of vegetables.
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