Summer corn fertilization technology
Reasonable fertilization is one of the key measures to achieve high yield of summer maize. It is necessary to comprehensively consider the characteristics of corn varieties, growth and development rules and the law of fertilizer requirements, as well as soil, climate and cultivation practices. Early summer corn has high temperature, high rainfall, rapid growth, short growth period, and late light and temperature are often insufficient. Therefore, corn fertilization is generally applied to base fertilizer, light application of seed fertilizer and seedling fertilizer, stable application of joint fertilizer, sudden attack of panicle fertilizer, and discretion. Apply fertilizer.
First, base fertilizer. Corn basal fertilizers should be dominated by organic fertilizers, and basal fertilizers generally account for 60%-70% of the total fertilizer.
Second, seed fertilizer and seedling fertilizer. Maize application of seed fertilizer production effect is obvious, generally can increase production by about 10%. Miaofei should be applied early, lightly and partially, mainly nitrogen fertilizer.
Third, the steady application of joint fertilizer. The jointing fertilizer should be applied stably, mainly based on available nitrogen fertilizer, and supplemented with appropriate amount of trace fertilizer. For maize with insufficient basal fertilizer and weak seedlings, the amount of chemical fertilizer should be increased. Generally, 10-15 kg of ammonium bicarbonate or 3-5 kg ​​of urea can be applied per acre. Jointing fertilizer usually opens a hole in the corn when 7-9 leaves appear. For the fertility of the ground fertilizer should be properly recovered, less chase, the weak should be early Shi Shi, Shi Shi.
Fourth, attacking panicle fertilizer. The amount of panicle fertilizer should account for about 50% of the total amount of fertilization, and mainly available nitrogen fertilizer. The application time is generally 10-15 days before tasselling. The amount of panicle fertilizer should be determined according to the situation of seedlings, soil fertility and jointing fertilizer application, and the general mu application. Ammonium bicarbonate 15-20 kg, or urea 5-8 kg.
Fifth, Qiao applied fertilizer. The main application of granular fertilizer is quick-acting nitrogen fertilizer, and it is also possible to spray 0.2% potassium dihydrogen phosphate solution on the foliage, and the amount of liquid sprayed per mu is about 50 kg.
Sixth, discretionary fertilizer. Maize is sensitive to zinc and if the available zinc in the soil is less than 0.5-1 mg/kg, zinc fertilizer is needed. Boron fertilizer can be used as base fertilizer, but also can be soaked.
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