The specific role and necessity of fertilizer Fertilizing is the method of applying a small amount of fertilizer under the seed when the crop is sown. Different names are called different places, such as the northeast region will be called fertilizer "mouth fat." Fertilizer is a fertilizer method that saves fertilizer and improves fertilizer efficiency. The specific role of seed fertilizer is mainly to achieve strong seedlings, laying the foundation for the final high crop yield. The seedling growth of spring sowing maize, cotton and soybeans does not require much nutrition. It requires that the supply of seed fertilizers is small and fine, but the response of the crops to the nutrition level is very strict and sensitive, especially general crops for phosphorus nutrition. The critical period of demand is at the seedling stage. If there is a slight shortage of phosphorus supply, phosphorus deficiency symptoms will affect the subsequent production. Therefore, fertilizers are particularly demanding for the supply of phosphate fertilizers. For example, phosphorus deficiency occurs at the 3-leaf stage of maize, and yellow leaf disease appears when soybean seedlings lack phosphorus in two true leaves. Once the symptoms of phosphorus deficiency occur at the seedling stage, it will be difficult to compensate for the loss caused by phosphorus deficiency at this time even if phosphorus fertilizer is added later. Especially when planting corn and soybeans in soils with low fertility or no organic fertilizer all year round, it is necessary to combine planting with phosphorus fertilizers. In modern high-yield cultivation, this has become an effective and mature technology for cultivating strong seedlings and increasing yields. Phosphorus is the most suitable nitrogen The seed fertilizer for spring sowing crops needs phosphate fertilizers most, followed by appropriate amount of nitrogen fertilizers. Both promote growth and keep seedlings strong. During the seedling stage of spring crops such as corn, cotton, and soybean, phosphorus is urgently needed. Phosphorus-applied fertilizer can promote the development of root system and improve the stress resistance of seedlings, so as to meet the target of Miao Qi and Miao Zhuang under adverse conditions such as cold-tolerance or drought. The amount of fertilizer applied is much less than that of basal fertilizer. Fertilizers with seed fertilizers can be either unit fertilizers or compound fertilizers. First of all, in the unit phosphate fertilizer, superphosphate is a quick-acting phosphate fertilizer, which can be used as a fertilizer. The appropriate dosage is between 6 and 10 kilograms per mu. In the unit nitrogen fertilizer, ammonium sulfate is used as a seed fertilizer, which has no adverse effect on seed germination and is an ideal nitrogen fertilizer variety. The amount of 5 kg per mu is appropriate. Not all other nitrogen fertilizers are suitable for use as seed fertilizers. For urea, due to its high nitrogen content, it is generally not suitable for seed fertilizer. If only urea is used as seed fertilizer, the amount should be controlled. It is appropriate to apply 5 kg of urea per acre, and it is required that the content of biuret in urea products should not be More than 1%. In compound fertilizers, DAP is a fast-acting N- and P dual-component compound fertilizer with high total nutrient content and supplemented mainly with phosphorus, which is suitable for all types of crops. In the spring sowing of corn and soybeans in the northeastern region, farmers are accustomed to using diammonium phosphate as mouth fat, with an average dosage of 3 to 5 kilograms per mu, which works well. Experts suggest that high-nitrogen-type compound fertilizers have high nitrogen content and low phosphorus content, and do not meet the requirements of seed fertilizers. The application of a high concentration of urea-based nitrogen at a high concentration will inhibit seed germination. In recent years, high-nitrogen compound fertilizers have been used. The burning of seedlings caused by seeding is more serious and widespread. Accurately grasp the application position of fertilizer Do not directly contact the seed with the seed fertilizer to prevent burning the roots. Phosphorus-nitrogen-phosphorus fertilizers should be applied at a certain depth below or below the seeds. It is advisable to isolate 2-5 cm between seed and fertilizer. Especially when high concentrations of phosphorus diammonium and urea are used as seed fertilizers, the amount must be controlled not to be large, and direct contact with the seeds must be avoided. Under the conditions of mechanical sowing, the seeds and fertilizers should be separated from the two reserve tanks and the two pipes, so that the fertilizers and seeds are not on the same soil surface to ensure safe emergence. 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