Phosphate should be applied to the crop that is most sensitive to its response. These crops are beans, rapeseeds, wheat, cotton, potatoes, melons, etc. The application of phosphate fertilizer can obtain higher economic benefits. Early application: Crops absorb phosphorus at the seedling stage fastest, accounting for half of the total phosphorus absorbed during the growth period. If phosphorus deficiency occurs at seedling stage, it will affect the growth of the later period. Even if it is supplemented later, it will be difficult to recover the loss of early phosphorus deficiency. Therefore, the seedling period cannot be deficient in phosphorus. Fine application: Superphosphate is easy to absorb moisture and agglomerate during storage. When it is applied, it must be smashed and sifted in order to facilitate root absorption. Concentrated application: Phosphorus is easily immobilized by elements such as iron, aluminum, and calcium in the soil. Therefore, it is necessary to apply and apply the phosphorus in the hole so that the phosphorus is fixed around the seed and the root system. This will not only be fixed by iron, aluminum, calcium and other elements in the surrounding soil, but also conducive to root absorption. Mixed application with organic fertilizer: Phosphate fertilizer, especially calcium magnesium phosphate fertilizer, is mixed with organic fertilizer to convert the insoluble phosphate in phosphate fertilizer into available phosphorus that can be easily absorbed by crops. Stratified application: Phosphorus fertilizer has a low mobility in the soil, where the application is not fixed. Therefore, phosphate fertilizers should be applied in both deep and shallow layers. Applying the phosphate fertilizer to the shallow layer is beneficial to the absorption of the seedlings, so that the crops return to the early stage and the crops will be delivered quickly. Generally, 20-40 kg of phosphate fertilizer is applied per hectare, 1/3 of shallow application and 2/3 of deep application. Mixed with nitrogen fertilizer: Crops absorb a variety of nutrients in a certain proportion, if the imbalance is not good. Single application of nitrogen fertilizer, root development is not good, easy lodging, but also susceptible to pests and diseases, but also to accelerate the excessive decomposition of nitrogen in the soil, causing imbalance in nitrogen and phosphorus ratio. The combination of nitrogen and phosphorus can both balance nutrients and promote root growth, laying the foundation for high yields. Root-spraying: When crops reach the late growth stage, the roots are gradually aging and the ability to absorb nutrients is reduced, often causing phosphorus deficiency. At this time, water-soluble superphosphate can be sprayed on the leaves of the crops so that the phosphorus can enter the plants through the pores or stratum corneum of the leaves. Spray on a sunny morning or evening.
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