Wide application of organic fertilizer. Maize is a high-yielding crop, and the level of its yield is closely related to the level of soil fertility. In the high-yield and high-efficiency fertilization measures for maize, the first step is to extensively apply organic fertilizers and improve soil fertility. Generally, the input amount of organic fertilizer per acre should not be less than 4,000 kilograms. .
Steady application of nitrogen fertilizer. Spring maize should be applied with base fertilizer to regulate the amount of top dressing and summer corn should be top dressing. In high-yielding fields with a yield of 500 kg or more, the nitrogen application rate per acre should be stabilized at 9-12 kg. For a medium yield field with a yield of 300-500 kg, the nitrogen application rate per acre should be stabilized at 7-10 kg; the low yield field with a yield per unit of less than 300 kg. 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.
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.
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-yield fields is about 8 kg per mu, the middle production field is about 7 kg, and low-yield fields are about 6 kg, and the ratio of nitrogen, phosphorus, and potassium should be 1:0.5:0.6.
Apply fertilizer. 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. Supplementary application of corn and zinc fertilizer can be applied in corn soaking, coating and other aspects, but also in the corn sowing or fertilizer at the seedling stage, the general application of 1 to 2 kg of zinc sulfate, but also in corn fertilizer or maize seedling stage Foliar spray, add zinc fertilizer spray fertilizer.
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