Summer sowing corn is part of the annual grain output. The level of yield depends on the fertilization method and fertilization technology. The scientific use of fertilizer is the key to improving yield and quality.
1. Mixed application of organic fertilizer and chemical fertilizer to improve fertilizer utilization. For monocropped corn, in order to improve fertilizer efficiency, organic fertilizer is generally mixed with chemical fertilizer. It is best to use the ditch. Boron, molybdenum and zinc fertilizers can be used as base fertilizer. The specific dosage per mu: one kilogram of borax and molybdenum sulfate, and 1.5 to 2 kilograms of zinc sulfate.
Second, lightly chasing the seedlings, re-applying the panicle fertilizer, supplementing the grain fertilizer. The time, the number of times of topdressing and the amount of topdressing per fertilizer should be considered comprehensively based on factors such as the appearance of the corn and the time required for fertilizer. The amount of fertilizer applied should be based on the nutrient status of the soil. In the field of general force level, 5 kg of nitrogen, 2 kg of phosphorus and 3 kg of potassium are required for each 100 kg of corn. The application of this amount of fertilizer is very simple, and it is only necessary to multiply the 100 kg of the increased yield by the amount of fertilizer required for 100 kg of grain. This is only a reference calculation method, and the specific application should be appropriately adjusted according to the place and the variety. The reference fertilization amount of corn per mu is: 1500 kg of farmyard manure, 9-11 kg of nitrogen, 4-5 kg ​​of phosphorus, 5-6 kg of potassium, and 1 kg of zinc fertilizer. Phosphorus and potassium fertilizers are long-acting fertilizers. The growth requirement of corn in the early stage is large, and it can be applied as a base fertilizer or a seedling fertilizer. Generally, 25-35 kg of phosphate fertilizer is applied per mu, and 10-15 kg of potash fertilizer. The application of nitrogen fertilizer can be applied in three stages: seedling stage, trumpet period and heading and flowering stage. The amount of fertilizer applied is based on lightly chasing the seedling fertilizer, applying the panicle fertilizer, and supplementing the three-step fertilization method. The amount of topdressing in the seedling stage accounts for 30% of the total amount of topdressing in the whole growth period of maize. The fertilization time can be applied during the period from the seedling to the jointing stage. It has the effect of strong seedlings, seedlings and strong stalks; the panicle fertilizer accounts for 50% of the total fertilizer. The top dressing time should be selected during the large bell mouth, which is best applied by ditching, which can effectively improve the utilization rate of fertilizer, increase the number of grains per panicle, and lay a foundation for high yield; supplement the application of granular fertilizer, and the amount of fertilizer applied accounts for 20% of the total fertilization amount. Fertilization time should be applied in the heading to the flowering stage, which can ensure the nutrient supply in the late corn, prolong the green leaf function period, prevent premature aging, increase 1000-grain weight, promote grain and grain weight, and have a significant effect on high yield.
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