Winter vegetable fertilization "four attention"
In winter, the temperature is low, the microbial activity is weakened, and the fertilized fertilizers that need to be transformed are slow, while the winter-sown crops need sufficient fertility, so it is necessary to pursue quick-acting fertilizers. Nitrogen fertilizer can use ammonium bicarbonate; phosphate fertilizer should use superphosphate as much as possible; potassium fertilizer can choose potassium chloride (but potato, tomato, etc. should be selected in the middle and late growth period of potassium chloride); application of compound fertilizer can choose 45% ternary Compound fertilizer. This is because ammonium bicarbonate is an ammonium nitrogen fertilizer compared with urea, which can be directly absorbed and utilized by crops after being applied to soil. Calcium superphosphate is a water-soluble quick-acting phosphate fertilizer, and its fertilizer efficiency is faster than that of calcium magnesium phosphate. However, it should be noted that it is best not to use ammonium bicarbonate in greenhouse vegetables, but to use 45% ternary compound fertilizer to prevent ammonia damage.
Among the winter crops, cruciferous crops account for a large proportion, such as cabbage, cabbage, radish, rapeseed, etc. These crops are particularly sensitive to boron. At the same time, celery, carrots, etc. are also sensitive to boron. Boron deficiency is not only severely affected by reproductive growth, but also vegetative growth hits the wall, the ability to resist cold is reduced, and heart rot is easily induced.
The application of wax fertilizer can increase the ground temperature by 2 °C to 3 °C, and increase the potassium content of the crop cells, thereby increasing the water holding capacity of the cells, making the cells less susceptible to freezing at low temperatures and strengthening the cold resistance. The application of wax fertilizer must be different for crops. Wheat should be applied in the middle and late December, and strong seedlings should be mixed with soil, while weak and late-maturing wheat should be mixed with appropriate amount of phosphate fertilizer. Each acre of field application or application of soil fertilization 2500 kg or so; perennial crops application of fertilization should account for 50% of the annual fertilization amount, 5000 kg per mu of soil and 2,500 kg of pig and cow manure, and It is better to apply before the snow after the frost.
In winter, there are more meteorological conditions of low temperature and low light, and greenhouse vegetables are more likely to cause large accumulation of nitrates, especially leafy vegetables and root vegetables. The amount of nitrogen fertilizer should be strictly controlled, and phosphorus and potassium fertilizer should be added. In particular, nitrate nitrogen fertilizers such as ammonium nitrate and potassium nitrate cannot be applied. A large amount of nitrate is not harmful, but it is easy to be converted into nitrite. Nitrite is easy to replace iron in human blood and cause blood poisoning.
Among the winter crops, cruciferous crops account for a large proportion, such as cabbage, cabbage, radish, rapeseed, etc. These crops are particularly sensitive to boron. At the same time, celery, carrots, etc. are also sensitive to boron. Boron deficiency is not only severely affected by reproductive growth, but also vegetative growth hits the wall, the ability to resist cold is reduced, and heart rot is easily induced.
The application of wax fertilizer can increase the ground temperature by 2 °C to 3 °C, and increase the potassium content of the crop cells, thereby increasing the water holding capacity of the cells, making the cells less susceptible to freezing at low temperatures and strengthening the cold resistance. The application of wax fertilizer must be different for crops. Wheat should be applied in the middle and late December, and strong seedlings should be mixed with soil, while weak and late-maturing wheat should be mixed with appropriate amount of phosphate fertilizer. Each acre of field application or application of soil fertilization 2500 kg or so; perennial crops application of fertilization should account for 50% of the annual fertilization amount, 5000 kg per mu of soil and 2,500 kg of pig and cow manure, and It is better to apply before the snow after the frost.
In winter, there are more meteorological conditions of low temperature and low light, and greenhouse vegetables are more likely to cause large accumulation of nitrates, especially leafy vegetables and root vegetables. The amount of nitrogen fertilizer should be strictly controlled, and phosphorus and potassium fertilizer should be added. In particular, nitrate nitrogen fertilizers such as ammonium nitrate and potassium nitrate cannot be applied. A large amount of nitrate is not harmful, but it is easy to be converted into nitrite. Nitrite is easy to replace iron in human blood and cause blood poisoning.
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