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I. Economic application: After the application of phosphate fertilizer, the crops in the current season can only absorb a small part of them, and the later effects can last for several years. Therefore, in the years after the application of phosphate fertilizer, it is not necessary to apply annually, which can avoid waste and reduce the economic burden of purchasing fertilizer.
Second, early application: the fastest absorption of phosphorus in the seedling stage, accounting for half of the total phosphorus absorption in the whole growth period of the crop. If the phosphorus deficiency in the seedling stage will affect the later growth, it is difficult to recover the early deficiency even after the later application. The loss of phosphorus, it is necessary to pay attention to the lack of phosphorus in the seedling stage of crops.
Third, fine application: superphosphate is easy to absorb moisture and agglomerate during storage, so when applied, it must be broken and sieved to facilitate the absorption of crop roots.
4. Centralized application: Phosphorus is easily fixed by the fixation of iron, aluminum, calcium and other elements in the soil. Therefore, at the time of application, the application and application of the hole should be carried out to fix the phosphorus around the seed and the root system, so as to avoid the fixation of the iron, the aluminum, the calcium and the like in the surrounding soil, and the absorption of the root of the crop.
5. Mixed application with organic fertilizer: Phosphate fertilizer, especially calcium magnesium phosphate fertilizer and organic fertilizer, can convert the insoluble phosphorus in the phosphate fertilizer into the effective phosphorus which is easily absorbed by crops.
Sixth, layered application: Phosphate fertilizer has little mobility in the soil, where it is basically where it is not moved, so phosphate fertilizer should be applied in both deep and shallow layers. Applying the phosphate fertilizer to the shallow layer is conducive to the absorption of the seedlings, so that the crops turn back early and the tillers are fast. The application of phosphate fertilizer is generally 1/3 in shallow layer and 2/3 in deep layer.
7. Mixed application with nitrogen fertilizer: There is a certain proportion of crops that absorb various nutrients. If the proportion is out of balance, it will not grow well. Single application of nitrogen fertilizer, root system is not well developed, easy to fall, and vulnerable to pests and diseases, and accelerate the excessive decomposition of nitrogen in the soil, causing imbalance of nitrogen to phosphorus ratio. The combination of nitrogen and phosphorus can balance nutrients and promote root growth, laying a foundation for high yield.
8. Spraying outside the roots: When the crops are in the late growth stage, the roots are gradually aging, and the ability to absorb nutrients is weakened, often resulting in phosphorus deficiency. At this time, the water-soluble calcium superphosphate can be sprayed on the leaves of the crop to allow the phosphorus to enter the body of the plant through the pores or stratum corneum of the foliage. For cereal crops, 1%-3% of phosphate fertilizer can be used, and vegetables can use 1% phosphate fertilizer. Spray on a sunny morning or evening.
IX. Application in phosphorus-deficient soil: For red soil dry fields, yellow mud fields, duck hoe fields, cold-dipped fields, etc., the application of phosphate fertilizer has a significant effect on yield increase, while for fertilizer fields, loam soils and fields where phosphate fertilizer is continuously applied in large quantities in previous years, Can be applied less appropriately.
Huaxian County Agricultural Products Inspection and Testing Center Chang Bili
Applying phosphate fertilizer to crops that are most sensitive to phosphorus reaction, such as beans, rapeseed, wheat, cotton, potato, and melon, can be used to obtain high economic benefits.
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