First, vegetables safety fertilization matters needing attention
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 urea, thiamine and other vegetable foliar spray fertilizer , although the vegetable leaves can be green, but the content of harmful salts in vegetables will increase significantly, thus affecting consumers Good health. Therefore, leafy vegetables should be prohibited from spraying high concentrations of nitrogen fertilizer.
3, shed indoor 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.
Second, vegetables fertilization considerations
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 the application of urea after watering <br> urea contains nitrogen in the form of amide nitrogen, amide nitrogen in the soil microbial secretion of urease, converted to ammonium sulfate or ammonium bicarbonate before being absorbed by vegetable roots use. If water is applied or rained immediately after urea application, the amide nitrogen opportunity 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.
3, avoid the use of carbon ammonium in water shortage <br> carbon ammonium is very unstable chemical, it is easy to volatilize. 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.
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 urea, thiamine and other vegetable foliar spray fertilizer , although the vegetable leaves can be green, but the content of harmful salts in vegetables will increase significantly, thus affecting consumers Good health. Therefore, leafy vegetables should be prohibited from spraying high concentrations of nitrogen fertilizer.
3, shed indoor 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.
Second, vegetables fertilization considerations
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 the application of urea after watering <br> urea contains nitrogen in the form of amide nitrogen, amide nitrogen in the soil microbial secretion of urease, converted to ammonium sulfate or ammonium bicarbonate before being absorbed by vegetable roots use. If water is applied or rained immediately after urea application, the amide nitrogen opportunity 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.
3, avoid the use of carbon ammonium in water shortage <br> carbon ammonium is very unstable chemical, it is easy to volatilize. 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.
(Xue Yuhua, Agricultural Science and Technology Station, Longmu Town, Da'an City, Jilin Province)
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