Dried organic fertilizer. Human feces and chicken manure have become the main base fertilizers for producing vegetables in greenhouses. However, for the convenience of application, the vegetable farmers often dry human feces and chicken manure in the fields and dry them up. This practice will cause fly maggots to reproduce, nitrogen will volatilize, and fertilizer will lose nitrogen nutrients.
Calcium, magnesium, and phosphorus are used as base fertilizers in alkaline soils. Calcium, magnesium, phosphorus is a weak acid fertilizer, insoluble in water, it can be gradually converted into water-soluble phosphate by the roots of the crop under weak acid conditions. However, applying it on alkaline soil can not solve the urgent need of phosphorus for crop seedlings and cause physiological deficiencies. phosphorus.
Superphosphate is applied topically as top dressing. Phosphorus is less mobile in soil and moves between 1-3 cm. Therefore, it is very difficult for the surface treatment to be transmitted to the crop rhizosphere, and therefore it is not possible to supplement phosphorus in the crop.
Watering immediately after urea application. Urea is amido ammonia nitrogen fertilizer, soluble in water, applied to the soil through decomposition can be converted to ammonium bicarbonate, was absorbed by crops, water immediately after the form of application, easy to make urea with water loss, reduce fertilizer efficiency.
Ammonium bicarbonate is applied with water. This method often results in more fertilizer in the intake, different crop growth, and difficulty in management. In the afternoon, the greenhouse temperature rises, ammonia gas escapes from the soil, and the lower leaves of the crop are smoked, resulting in fertilizer damage.
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