Formulated fertilization According to the fertilizer characteristics of different vegetables and soil fertility status, the appropriate amount of nitrogen, phosphorus, potassium and trace elements and the corresponding fertilization techniques were determined. The maximum demand periods for nitrogen, phosphorus and potassium in greenhouse vegetables are: 75-140 days after planting, 30-52 days for tomatoes, and 30-60 days for sweet peppers. Other vegetables have very little need for trace elements, but they are essential. When using micro-fertilizer leaf spray, the dosage should be good. Note that leafy vegetables should not be foliar sprayed to avoid increasing nitrate content.
Strict control of nitrogen fertilizer application Nitrogen fertilizer is an indispensable fertilizer in vegetable production, but it cannot be applied excessively. In order for vegetables to meet national and international standards for pollution, the nitrate content of vegetables must be reduced. To reduce the amount of nitrogen fertilizer application, it should be based on the amount of fertilizer required by different vegetables. Generally, 10-12 kg of pure nitrogen per mu is suitable; nitrogen fertilizer should be applied deep, and it should be applied with phosphorus or potassium fertilizer or ternary compound fertilizer. After application, it is necessary to cover the soil in time. It is best to use the fertilizer intubation or combined with the drip irrigation under the membrane to reduce the loss, improve the utilization rate, and stop the application 20 days before harvest.
It is forbidden to apply nitrate nitrogen fertilizer, ammonium sulfate, ammonium nitrate fertilizer, potassium nitrate and compound fertilizer containing nitrate nitrogen. It is easy to accumulate nitrate in vegetables after application. In addition, it is not suitable to apply chlorinated fertilizers such as potassium chloride, ammonium chloride, etc., chloride ions can reduce the starch and sugar content in vegetables, so that the quality is worse, the yield is reduced, and the residual soil in the soil is easy to cause decalcification of the soil, causing the knot . Fertilizers such as magnesium sulfate and ammonium sulfate are applied to the soil, and the sulfate ions which are decomposed are not easily absorbed by the vegetables and remain in the soil, which is harmful to the growth of vegetables. It is forbidden to apply ammonium bicarbonate, which is easy to cause ammonia damage due to the volatile large amount of ammonia gas.
The application of ecological organic fertilizer to the ecological and organic fertilizer produced by fermentation of livestock and poultry manure will form a series of special fertilizers if targeted with different elements. The organic matter content of ecological organic fertilizer can reach 45%, which can play the role of nitrogen fixation, phosphorus dissolving and potassium dissolving, and can also decompose residual substances of pesticides and fertilizers. It can be fermented and matured in 5-6 days in spring, summer and autumn, and mature in 7-10 days in winter. Generally, the heap is 1-3 days, the temperature in the reactor rises to 80 °C, which can kill E. coli and eggs, eliminate the smell of chicken manure, and then the compost becomes loose and dry, and it is covered with white hyphae. It can be issued after two days. A variety of koji scent.
Restricting the use of hormones Some vegetable farmers do not talk about the quality of vegetables. In order to pursue high yield, early maturity, morning market, the application of gibberellin, ethephon, paclobutrazol and other hormones to promote and ripen, greatly reduce the quality of vegetables, people have long-term consumption for good health. unfavorable.
Strict control of nitrogen fertilizer application Nitrogen fertilizer is an indispensable fertilizer in vegetable production, but it cannot be applied excessively. In order for vegetables to meet national and international standards for pollution, the nitrate content of vegetables must be reduced. To reduce the amount of nitrogen fertilizer application, it should be based on the amount of fertilizer required by different vegetables. Generally, 10-12 kg of pure nitrogen per mu is suitable; nitrogen fertilizer should be applied deep, and it should be applied with phosphorus or potassium fertilizer or ternary compound fertilizer. After application, it is necessary to cover the soil in time. It is best to use the fertilizer intubation or combined with the drip irrigation under the membrane to reduce the loss, improve the utilization rate, and stop the application 20 days before harvest.
It is forbidden to apply nitrate nitrogen fertilizer, ammonium sulfate, ammonium nitrate fertilizer, potassium nitrate and compound fertilizer containing nitrate nitrogen. It is easy to accumulate nitrate in vegetables after application. In addition, it is not suitable to apply chlorinated fertilizers such as potassium chloride, ammonium chloride, etc., chloride ions can reduce the starch and sugar content in vegetables, so that the quality is worse, the yield is reduced, and the residual soil in the soil is easy to cause decalcification of the soil, causing the knot . Fertilizers such as magnesium sulfate and ammonium sulfate are applied to the soil, and the sulfate ions which are decomposed are not easily absorbed by the vegetables and remain in the soil, which is harmful to the growth of vegetables. It is forbidden to apply ammonium bicarbonate, which is easy to cause ammonia damage due to the volatile large amount of ammonia gas.
The application of ecological organic fertilizer to the ecological and organic fertilizer produced by fermentation of livestock and poultry manure will form a series of special fertilizers if targeted with different elements. The organic matter content of ecological organic fertilizer can reach 45%, which can play the role of nitrogen fixation, phosphorus dissolving and potassium dissolving, and can also decompose residual substances of pesticides and fertilizers. It can be fermented and matured in 5-6 days in spring, summer and autumn, and mature in 7-10 days in winter. Generally, the heap is 1-3 days, the temperature in the reactor rises to 80 °C, which can kill E. coli and eggs, eliminate the smell of chicken manure, and then the compost becomes loose and dry, and it is covered with white hyphae. It can be issued after two days. A variety of koji scent.
Restricting the use of hormones Some vegetable farmers do not talk about the quality of vegetables. In order to pursue high yield, early maturity, morning market, the application of gibberellin, ethephon, paclobutrazol and other hormones to promote and ripen, greatly reduce the quality of vegetables, people have long-term consumption for good health. unfavorable.
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