Apply organic fertilizer widely. Corn is a high-yield crop, and its yield level is closely related to the soil fertility level. In the high-yield and high-efficiency fertilization measures of corn, the first is to widely apply organic fertilizers to improve soil fertility. Generally, the input of organic fertilizer per acre should not be less than 4000 kg.
Apply nitrogen fertilizer steadily. In high-yield fields with a yield of more than 500 kg, nitrogen application per mu should be stabilized at 9-12 kg; in medium-yield fields with a yield of 300-500 kg, nitrogen application per mu should be stabilized at 7-10 kg. For low-yield fields with a yield of less than 300 kg, nitrogen application per mu should be stabilized at 6 to 8 kg. At the same time, rationally adjust the application period and method to improve the effect of nitrogen fertilizer utilization.
Increase the application of potassium fertilizer. As the available potassium in the soil decreases year by year, the area of ​​potassium deficiency continues to expand. In order to meet the demand for potassium in corn growth, potassium fertilizer must be fully applied. The suitable potassium fertilizer application rate in high-yield fields is about 8 kg per mu, about 7 kg in medium-yield fields, and about 6 kg in low-yield fields. The application ratio of nitrogen, phosphorus, and potassium should be 1:0.5:0.6.
Control the application of phosphate fertilizer. At present, the role of phosphate fertilizer has been generally recognized by people, but the application of phosphate fertilizer should be based on the reasonable determination and control of the amount of available phosphorus in the soil. In the fields with high, medium and low yields, the appropriate phosphorus application rate per mu should be controlled within the range of 7 kg, 6 kg and 5 kg, respectively. Spring corn phosphate fertilizer is generally applied as a base fertilizer, and summer corn can be applied with nitrogen fertilizer. Application of phosphate fertilizer should emphasize deep application and early application.
Add micro-fertilizer. Due to the improvement of corn varieties, the reform of farming system and the change of fertilization structure, the symptoms of trace element deficiency in soil are becoming more and more obvious, especially the symptoms of zinc deficiency in corn have appeared in large areas. The special foliar fertilizer for corn can be sprayed at the corn seedling stage to comprehensively supplement various trace elements, especially zinc, to promote the healthy growth of crops and root development, so as to achieve the purpose of increasing production and income.
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