Several common misuses of fertilizers

Organic fertilizer drying preparation: drying of human and animal excreta will cause fly maggot breeding, loss of fertilizer nitrogen nutrients. The correct approach is to compost organic fertilizer into base fertilizer, such as 4000 kg of human excrement or chicken manure in the sunny place in late July, 100 kg of calcium magnesium phosphate fertilizer, and 400 kg of ground wheat straw. , Covering the stack with plastic film for 30 days.

Calcium, magnesium and phosphate fertilizers are used as base fertilizers in alkaline soils: Calcium, magnesium, and phosphate fertilizers are weakly acidic fertilizers that are insoluble in water and can only be converted into water-soluble phosphates that are absorbed by the roots of crops under weak acid conditions, but are not suitable for use on alkaline soils. Can not solve the needs of crop seedlings on phosphorus, easily lead to physiological phosphorus deficiency. The correct method is best to use in acidic soils, and when used as a seed fertilizer or root, the amount should not be too large, and pay attention not to direct contact with the seeds, so as not to cause burning seedlings.

Superphosphate surface application as topdressing: Phosphorus moves in the soil in the range of 1-3 cm, surface spread is difficult to transmit to the crop rhizosphere. The correct approach is to concentrate calcium superphosphate on the dense layer of roots as base fertilizer to reduce contact with the soil. It is possible to open 8 cm deep trenches in the transplanting rows, cover the soil with 4-5 cm of earth after spraying phosphorus fertilizer, and then sow or transplant the crops in the shallow trenches.

Watering immediately after urea application: Urea is easily soluble in water, watering immediately after surface application, easily losing urea with water and reducing fertilizer efficiency. The correct approach is to apply urea early, deep and root external application. The applied urea should be mixed well with the soil to prevent burning of the roots, and the soil should be covered tightly after spraying. Water 5-7 days later to allow sufficient time for sufficient ammoniation in the soil for crop absorption. In addition, 0.3% urea solution can also be used for foliar spray.

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