Wide application of organic fertilizer. Maize is a high-yielding crop, and its yield level is closely related to the level of soil fertility. In the high-yield and high-efficiency fertilization measures for maize, the first is to apply organic fertilizers extensively to increase the soil fertility. Generally, the input amount of organic fertilizer per acre should not be less than 4,000 kilograms.
Steady application of nitrogen fertilizer. In high-yielding fields with yields of more than 500 kg per unit, the nitrogen application per acre should be stabilized at 9 to 12 kg; for a medium yield field with a unit yield of 300 to 500 kg, nitrogen application per mu should be stabilized at 7 to 10 kg. For low-yielding fields with a yield of less than 300 kilograms, the nitrogen per acre should be stable at 6-8 kg. At the same time, reasonable adjustment of the application period and methods to improve the use of nitrogen fertilizer.
Increase potassium fertilizer. With the rapid decline of soil available potassium, the area of ​​potassium deficiency continues to expand. In order to meet the demand of corn for the growth of potassium, potassium fertilizer must be fully applied. The suitable amount of potash fertilizer in high-yielding fields is about 8 kg per mu, the middle production field is about 7 kg, the low-yielding fields are about 6 kg, and the ratio of nitrogen, phosphorus, and potassium is 1:0.5:0.6.
Controlling phosphate fertilizers. At present, the role of phosphate fertilizer has been widely recognized, but the application of phosphate fertilizer should be determined and controlled according to the amount of soil available phosphorus content. In the high, medium and low yield fields, the appropriate amount of phosphorus per acre should be controlled within the ranges of 7 kg, 6 kg and 5 kg, respectively. Spring corn phosphorus fertilizer is generally used as base fertilizer, and summer corn can be applied with nitrogen fertilizer. Phosphate fertilizer application should emphasize deep application and early application.
Supplement micronutrients. Due to the improvement of corn varieties, the reform of farming system and the change of fertilization structure, the deficiency of trace elements in soil is becoming more and more obvious. In particular, the symptoms of zinc deficiency in maize have emerged on a large scale. The special foliar fertilizer for maize can be sprayed at the seedling stage of maize to fully supplement various trace elements, especially zinc, to promote the healthy growth of the crop and the development of the root system, thereby achieving the purpose of increasing the production and increasing the income.
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