"Guang": It means to apply organic fertilizer widely. In the high-yield and high-efficiency fertilization measures for spring corn, the first is to apply organic fertilizers extensively to improve soil fertility. Generally, the input amount of organic fertilizer per mu should not be less than 4000 kg.
"Stable": That is, the steady application of nitrogen fertilizer. In high-yield fields with a yield of more than 500 kg, nitrogen application per mu should be stable at 9-12 kg; for medium-yield fields with a yield of 300-500 kg, nitrogen application per mu should be stabilized at 7-10 kg; and in low-yield fields with a yield of less than 300 kg , Nitrogen application per mu should be stable at 6-8 kg. At the same time, reasonably adjust the application period and method to improve the effect of nitrogen fertilizer utilization.
"Control": that is, controlled application of phosphate fertilizer. Phosphate fertilizer should be reasonably determined and controlled according to the effective phosphorus content of the soil. In the fields of high, medium and low yields, the appropriate amount of phosphate fertilizer application per mu should be controlled within the range of 7 kg, 6 kg and 5 kg respectively. Spring corn phosphate fertilizer is generally used as the base fertilizer.
"Increase": That is, increase the application of potash fertilizer. The appropriate potassium fertilizer application rate for high-yield fields is about 8 kg per mu, for middle-yield fields about 7 kg, and for low-yield fields about 6 kg. The application ratio of nitrogen, phosphorus, and potassium should be 1:0.5:0.6.
"Supplement": That is, the application of micro-fertilizer. Due to the improvement of maize varieties, the reform of farming system and the change of fertilization structure, the symptoms of microelement deficiency in the soil have become more and more obvious, especially the symptoms of zinc deficiency in maize have appeared on a large scale. Supplementary application of zinc fertilizer for corn can be applied in corn seed soaking, coating, etc., or 1-2 kg of zinc sulfate can be commonly applied during corn sowing or topdressing at seedling stage, and it can also be used in special fertilizer for corn or corn seedling leaves. Spray the surface and add zinc fertilizer in the spray fertilizer.
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