Corn science fertilization should focus on four aspects.
First, the principle. In fertilization, we should grasp the application of nitrogen, phosphorus, potassium and trace elements, balance fertilization, deep application of fertilizer, staged topdressing, water and fertilizer combination, and improve fertilizer efficiency. In terms of fertilization amount, it should be considered comprehensively according to various factors such as the fertilizer absorption rule, yield level, soil fertility capacity, fertilizer nutrient content and utilization rate.
Second, the base fertilizer. The fertilizer applied before sowing is called base fertilizer. Generally, organic fertilizer, compound fertilizer or part of nitrogen fertilizer, potassium fertilizer and micro-fertilizer are mixed and concentrated in the ditch. If it is too late to apply, it can be applied once as a seedling.
Third, the seed fertilizer. When planting, the fertilizer applied next to the seed or along with the seed is the seed fertilizer. It can satisfy the needs of nutrients in the early stage of corn growth, and promote the development of the lineage and the growth of seedlings. Generally, diammonium phosphate or compound fertilizer and urea 3 kg per mu should be used as a fertilizer, and the fertilizer should be isolated to prevent injury.
Fourth, topdressing. The fertilizer applied during the growing period of corn is topdressing. The period, frequency and quantity of topdressing should be based on the law of corn absorption, the level of production, the geographical basis, and the peak period of demand. At this time, if the supply of nutrients is insufficient, there will be falling flowers and fruit. Malnutrition can also affect the normal development of flower organs and fruits. If pollen is small and the style is slender and uneven, it can not be pollinated and shedding.
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