Early application of crops to absorb phosphorus at the seedling stage is fastest, if the phosphorus deficiency at seedling stage will affect the growth of the later period. Fine superphosphate is easy to absorb moisture and agglomerate when it is stored. When it is applied, it must be smashed and sifted so as to absorb the root system. Concentrated application of phosphorus is easily fixed by iron, aluminum, and calcium in the soil and fails. Therefore, it is necessary to apply and apply phosphorus in the soil so that the phosphorus is fixed around the seed and the root system, which is beneficial to the absorption of the crop root. Mixed application with organic fertilizers, especially calcium, magnesium and phosphate fertilizers must be mixed with organic fertilizers to convert those insoluble phosphates in phosphate fertilizers into available phosphorus for crops. As phosphorus fertilizers are mixed in organic fertilizers, contact with the soil can be reduced, thereby increasing the fertilizer efficiency of phosphate fertilizers. Phosphorus-dilution in the soil is less mobile in the soil and where it is applied is where it does not move. Therefore, phosphate fertilizers should be applied to both the bottom layer and the shallow layer. The combined application of nitrogenous fertilizer and nitrogenous fertilizer and phosphate fertilizer can balance nutrients, promote the down-rooting of crop roots, and lay a foundation for high yield. After the roots are sprayed on the crops to the late growth stage, the roots are aged and the ability to absorb nutrients is weakened, often causing a lack of phosphorus. At this time, water-soluble superphosphate can be sprayed on the leaves to allow the phosphorus to enter the plants through the holes or cuticles of the leaves. Cereal crops can be used at a concentration of 1% to 3% and vegetables at a concentration of 1%. , spraying on a sunny morning or evening. Appropriate amount of fertilizer with long-term application of phosphate fertilizer, base application can control 2 to 3 crops at a time, so it is not necessary to apply phosphate fertilizer for every crop, generally 1 to 2 years of base application can be. At the same time, the appropriate amount should be calculated based on the target crop yield and soil fertility of different crops, and the balance of nitrogen, phosphorus and potassium nutrients should be considered. Phosphate fertilizers are applied to the soil. For example, superphosphate is an acidic fertilizer that is suitable for neutral and alkaline soils; and calcium magnesium phosphate fertilizers are best used in partially acidic soils. Phosphorus fertilizers applied to crops are most suitable for crops that are particularly sensitive to phosphorus, and they are mainly used in legumes, cotton, wheat, potatoes, and melons, with good economic returns. In addition, phosphate fertilizers should be applied intensively with a small amount, but the effect is large. Can not be mixed with alkaline fertilizer plant ash, lime, etc. are all alkaline substances, if used in combination, the effectiveness of phosphate fertilizer will be significantly reduced, and adverse to crop yield increase. Generally should be 7 to 10 days apart.
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