The fertilization of spring corn should be light before and after fertilization.

Base fertilizer spring corn should be fertilized according to the basic principles of base fertilizer, topdressing, farm fertilizer, chemical fertilizer, nitrogen fertilizer, phosphate fertilizer, ear fertilizer and grain fertilizer. Base fertilizer should generally account for about 70% of the total fertilization, and most phosphate fertilizers should also be applied in combination with base fertilizer, usually in combination with autumn ploughing in the previous year. When applying base fertilizer, it should be evenly mixed with the soil. If nitrogen fertilizer is used as base fertilizer, it must be applied deeply to prevent the loss of nitrogen volatilization. In phosphorus-deficient soils, 450 kg of calcium applied per hectare; 150 kg of potassium chloride per hectare in potassium-deficient soils; and 15 kg of zinc sulfate heptahydrate per hectare in zinc-deficient soils. Before spring sowing, use a small amount of farm manure combined with appropriate amount of nitrogen and phosphorus fertilizer strip or hole application as corn seed fertilizer. Topdressing spring maize usually adopts the fertilization method of "light in the front and heavy in the second", that is, before jointing, the amount of urea applied is 75kg / ha, 150kg / ha, 2cm / ha and 150kg / ha, respectively, to meet the nutrient needs of spikelet, floret differentiation and grain formation stage of maize. The experimental results show that the yield of spring corn is 13.3% higher than that of "light in front and heavy in later".