1. Application of ammonium nitrate Chinese cabbage, Chinese cabbage, leeks, celery, spinach and Other green leafy vegetables have short growth period and easy to absorb nitrate nitrogen fertilizer, which will lead to excessive nitrate content in vegetables. Green leafy vegetables should not be applied with ammonium nitrate.
2, the spraying of pure nitrogen fertilizer green leafy vegetables should not be sprayed with nitrogen or urea such as ammonium sulfate, and should not spray urine. Urea, ammonium sulfate or human urine sprayed on the leaf surface, the nitrate content will increase significantly, affecting human health.
3. After urea application, urea can not be immediately irrigated. Only under the action of urease secreted by soil microorganisms can ammonium or ammonium bicarbonate be absorbed by vegetable roots or adsorbed by soil. Immediately after the application of urea, water or rain, the nitrogen in the amide state will be lost with water, resulting in loss of nitrogen nutrients. Generally, urea is applied for 5-7 days and then re-irrigated to avoid unnecessary nitrogen loss.
4. Ammonium sulfate should not be applied repeatedly in acidic soil or lime vegetable field. If the ammonium sulfate is applied repeatedly for several times, the acidic soil will become more acidic; the calcareous soil will cause soil compaction and hinder the normal growth of vegetables.
5, the lack of water in the vegetable field is not suitable for the application of ammonium bicarbonate ammonium bicarbonate is extremely unstable, volatile loss, especially in the case of drought and water shortage in vegetable fields, the loss is more serious. The application of ammonium bicarbonate in the vegetable field, whether as base fertilizer or top dressing, should be carried out in the case of wetness of the vegetable field, and the soil should be covered immediately after application.
6, the amount of phosphate fertilizer should not be too much, such as the use of phosphate fertilizer in a large number of years, the supply of phosphate fertilizer is too much, especially when the application of more than 40 kg of mu is harmful, it will seriously affect the growth and development of vegetables, causing premature aging of vegetable plants, poor growth. The output is reduced and the quality is deteriorated. Generally, it is suitable to apply 15-20 kg per mu.
7, green leafy vegetables should not be applied to manure manure and manure, especially in the septic tanks of hospitals, stations, docks, restaurants and public toilets, containing a variety of infectious bacteria and parasite eggs. If the manure is directly applied to the green leafy vegetables without being tanning or treated, the vegetables will be seriously polluted and even cause a variety of infectious diseases and parasitic diseases. The use of such manure can be applied after decontamination treatment such as sealed stacking, biogas fermentation, and drug treatment.
8. The feed of pigs and cattle should be mixed with crop straw and weeds, while the straw and weeds are mixed with many weed seeds. The weed seeds in the manure and manure are extremely strong. Fecal manure can be germinated and propagated in the vegetable field, which is very harmful to vegetables. The manure should be taken out of the circle and piled up at high temperature to kill weed seeds, parasitic eggs and pathogenic bacteria in the livestock manure. It can be applied naturally in about 2 months, and it can be fully decomposed if it is treated with biological starter for 10 days.
Agricultural resources report
2, the spraying of pure nitrogen fertilizer green leafy vegetables should not be sprayed with nitrogen or urea such as ammonium sulfate, and should not spray urine. Urea, ammonium sulfate or human urine sprayed on the leaf surface, the nitrate content will increase significantly, affecting human health.
3. After urea application, urea can not be immediately irrigated. Only under the action of urease secreted by soil microorganisms can ammonium or ammonium bicarbonate be absorbed by vegetable roots or adsorbed by soil. Immediately after the application of urea, water or rain, the nitrogen in the amide state will be lost with water, resulting in loss of nitrogen nutrients. Generally, urea is applied for 5-7 days and then re-irrigated to avoid unnecessary nitrogen loss.
4. Ammonium sulfate should not be applied repeatedly in acidic soil or lime vegetable field. If the ammonium sulfate is applied repeatedly for several times, the acidic soil will become more acidic; the calcareous soil will cause soil compaction and hinder the normal growth of vegetables.
5, the lack of water in the vegetable field is not suitable for the application of ammonium bicarbonate ammonium bicarbonate is extremely unstable, volatile loss, especially in the case of drought and water shortage in vegetable fields, the loss is more serious. The application of ammonium bicarbonate in the vegetable field, whether as base fertilizer or top dressing, should be carried out in the case of wetness of the vegetable field, and the soil should be covered immediately after application.
6, the amount of phosphate fertilizer should not be too much, such as the use of phosphate fertilizer in a large number of years, the supply of phosphate fertilizer is too much, especially when the application of more than 40 kg of mu is harmful, it will seriously affect the growth and development of vegetables, causing premature aging of vegetable plants, poor growth. The output is reduced and the quality is deteriorated. Generally, it is suitable to apply 15-20 kg per mu.
7, green leafy vegetables should not be applied to manure manure and manure, especially in the septic tanks of hospitals, stations, docks, restaurants and public toilets, containing a variety of infectious bacteria and parasite eggs. If the manure is directly applied to the green leafy vegetables without being tanning or treated, the vegetables will be seriously polluted and even cause a variety of infectious diseases and parasitic diseases. The use of such manure can be applied after decontamination treatment such as sealed stacking, biogas fermentation, and drug treatment.
8. The feed of pigs and cattle should be mixed with crop straw and weeds, while the straw and weeds are mixed with many weed seeds. The weed seeds in the manure and manure are extremely strong. Fecal manure can be germinated and propagated in the vegetable field, which is very harmful to vegetables. The manure should be taken out of the circle and piled up at high temperature to kill weed seeds, parasitic eggs and pathogenic bacteria in the livestock manure. It can be applied naturally in about 2 months, and it can be fully decomposed if it is treated with biological starter for 10 days.
Agricultural resources report
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