Organic fertilizer drying: The drying of human and feces will cause the maggots to multiply and lose the nitrogen nutrients of the fertilizer. The correct way is to use the organic fertilizer to be used as a base fertilizer. For example, in the late July, 4000 kg of human feces or chicken manure will be added to the sun, 100 kg of calcium magnesium phosphate will be added, 400 kg of wheat straw will be mixed, and the pile will be piled into a steamed bun. Stacked with plastic film for 30 days.
Calcium, magnesium and phosphorus fertilizers are used as basic fertilizers in alkaline soils: calcium, magnesium and phosphorus fertilizers are weakly acidic fertilizers, insoluble in water, and can be gradually converted into water-soluble phosphates under the weak acid conditions, which are absorbed by crop roots, but it is wrong to apply them on alkaline soils. It can not solve the need of phosphorus in crop seedlings, and it is easy to cause physiological phosphorus deficiency. The correct way is to use it in acidic soil, and it should not be used too much when used as seed fertilizer or root, and pay attention not to contact with seeds directly, so as not to cause burning seedlings.
The surface of the superphosphate is applied as a top dressing: the movement of phosphorus in the soil ranges from 1-3 cm, and it is difficult to transmit it to the rhizosphere of the crop. The correct approach is to concentrate the superphosphate on the root layer and use it as a base fertilizer to reduce contact with the soil. You can open a 8 cm deep ditch in the transplanting plant, sprinkle the soil with 4-5 cm after spraying the phosphate fertilizer, and then sow or transplant the crop in the shallow ditch.
Immediately after the application of urea, water is poured: urea is easily soluble in water, and water is immediately poured after the soil surface is applied. It is easy to make urea lose with water and reduce fertilizer efficiency. The correct way is to apply urea early, deep application and root application. The urea to be applied should be thoroughly mixed with the soil to prevent burning of the roots. After the application, the soil should be tightly covered, and the crops with large row spacing can be applied deep. Watering after 5-7 days, it will have enough time in the soil to fully ammoniaize to facilitate crop absorption. In addition, a 0.3% urea solution can be used for foliar application.
Calcium, magnesium and phosphorus fertilizers are used as basic fertilizers in alkaline soils: calcium, magnesium and phosphorus fertilizers are weakly acidic fertilizers, insoluble in water, and can be gradually converted into water-soluble phosphates under the weak acid conditions, which are absorbed by crop roots, but it is wrong to apply them on alkaline soils. It can not solve the need of phosphorus in crop seedlings, and it is easy to cause physiological phosphorus deficiency. The correct way is to use it in acidic soil, and it should not be used too much when used as seed fertilizer or root, and pay attention not to contact with seeds directly, so as not to cause burning seedlings.
The surface of the superphosphate is applied as a top dressing: the movement of phosphorus in the soil ranges from 1-3 cm, and it is difficult to transmit it to the rhizosphere of the crop. The correct approach is to concentrate the superphosphate on the root layer and use it as a base fertilizer to reduce contact with the soil. You can open a 8 cm deep ditch in the transplanting plant, sprinkle the soil with 4-5 cm after spraying the phosphate fertilizer, and then sow or transplant the crop in the shallow ditch.
Immediately after the application of urea, water is poured: urea is easily soluble in water, and water is immediately poured after the soil surface is applied. It is easy to make urea lose with water and reduce fertilizer efficiency. The correct way is to apply urea early, deep application and root application. The urea to be applied should be thoroughly mixed with the soil to prevent burning of the roots. After the application, the soil should be tightly covered, and the crops with large row spacing can be applied deep. Watering after 5-7 days, it will have enough time in the soil to fully ammoniaize to facilitate crop absorption. In addition, a 0.3% urea solution can be used for foliar application.
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