Correct application of phosphate fertilizer techniques, for reference only: 1. 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. 2. Fine application: Superphosphate is easy to absorb moisture and agglomerate when it is stored. When it is applied, it must be smashed and sieved to facilitate root absorption. 3. 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. 4. Mixed application with organic fertilizer: Phosphate fertilizer, especially calcium magnesium phosphate fertilizer and organic fertilizer, can make phosphorus which is insoluble in phosphate fertilizer convert into phosphorus which is easily absorbed by crops. 5. 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, 4-8 pounds of phosphate fertilizer per acre, shallow 1/3, deep 2/3. 6. Mixed application 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. 7. Spraying outside the root: When the crop reaches the late stage of growth, the roots gradually age and absorb nutrients, which often results in lack of phosphorus. 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. Mushi 15-20 pounds.
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