Phosphorus has many effects on plants. In order to improve the plant's resistance to stress, it is necessary to apply phosphate fertilizer correctly and rationally. The following are the methods of applying phosphate fertilizer and the precautions in the small series compiled by Huinong. You can refer to the following: (below The content is not for a certain crop, so in the process of use, according to the specific crop, the specific application of phosphate fertilizer.) 1. Phosphorus application at seedling stage: The phosphorus uptake of crops is the fastest in seedling stage. If phosphorus is lost at seedling stage, it will affect the later growth. 2, sieve fine phosphorus: Superphosphate is easy to absorb moisture and agglomerate during storage. When applied, it is broken and sieved to facilitate root absorption. 3. Concentrated phosphorus application: Phosphorus is easily fixed by iron, aluminum and calcium in the soil, so it should be applied to the roots and branches, which is beneficial to the absorption of plant roots and improve the survival rate and resistance of plants. 4. Mixed application of phosphorus and organic fertilizer: In particular, calcium magnesium phosphate fertilizer must be mixed with organic fertilizer to convert the insoluble phosphorus in the phosphate fertilizer into effective phosphorus that can be utilized by plants. Since the phosphorus fertilizer is mixed in the organic fertilizer, the contact with the soil can be reduced, thereby improving the fertilizer efficiency of the phosphate fertilizer. 5. Layered phosphorus application: Due to the mobility of phosphate fertilizer in the soil, it is necessary to apply phosphate fertilizer in the bottom layer and the superficial layer, generally 10 kg per mu. 6. Mixing nitrogen and phosphorus: Nitrogen and phosphate fertilizers can be used to balance nutrients and promote crop roots. 7, external spray: When the plant reaches the late stage of growth, the roots are aging, the ability to absorb nutrients is weakened, and the plant is often deficient in phosphorus. At this point, water soluble potassium perphosphate can be sprayed onto the leaves to allow the phosphorus to enter the plant through the pores or stratum corneum on the leaves. 8, the right amount of phosphorus: Phosphate fertilizer has long effect, and the base fertilizer can be used for 2 to 3 crops at a time. Generally speaking, it is not necessary to apply phosphate fertilizer to each crop, so one or two years of base fertilizer can be applied once. At the same time, according to different plant and soil fertility, the applicable amount should be calculated to ensure the balance of nitrogen, phosphorus and potassium nutrients. 9. Phosphorus application to the soil: Phosphate fertilizers such as superphosphate are acidic fertilizers and are suitable for application in neutral and alkaline soils, while calcium, magnesium and phosphorus fertilizers are preferably applied in acidic soils. 10, can not be mixed with alkaline fertilizer: Grass ash, lime, etc. are all alkaline substances. If mixed with phosphate fertilizer, the effectiveness of phosphate fertilizer will be significantly reduced, generally should be applied 7 to 10 days later.
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