The whole growth process of corn is divided into three stages: seedling stage, ear stage and flowering stage. The absorption of nitrogen, phosphorus and potassium is different at different stages, with the most nitrogen, followed by potassium and less phosphorus. For summer corn, the time to absorb nitrogen is earlier and the absorption is faster. Nitrogen uptake accounted for 10% of total in seedling stage, 76% in jointing and booting stage, 14% in heading to maturity, phosphorus absorption was earlier, 10% in seedling stage, and 62% in jointing and booting stage. At the heading fertilization and grain formation period, it absorbs 28%; for potassium, more than 70% is absorbed before heading, and 30% is absorbed during heading and fertilization. It can be seen that the absorption of nitrogen, phosphorus and potassium in maize showed less seedling stage, significantly increased jointing stage, and the characteristics of fertilizer required to reach the peak at the heading stage. Due to the tight sowing time, it is not possible to apply soil fertilizer and top dressing to the summer corn, which is not suitable for soil preparation and application of base fertilizer. Fertilizer: Nitrogen, phosphorus, potassium compound fertilizer or diammonium phosphate is the best for seed fertilizer. It can be used for 10-15 kg per mu. Ditch or plan hole application, stir with soil and then plant, or use 耧Fertilizer, then sow seeds next to the ditch, to achieve seed, fertilizer isolation, avoid beaker seeds. Top dressing: The top dressing should be carried out twice in a “pre-weight and light†manner. First, the topdressing stage accounts for 60% of the total topdressing amount, and the urea application is 15-20 kg. The second is to topdress in the big bell mouth, the amount of topdressing accounts for 40%, and the urea is about 10-15 kg. Practice shows that the summer maize adopts the “before heavy and light†method, which can increase the yield by more than 12% compared with the “before and then heavy†topdressing method; in the phenological period, the multiple top dressings can increase the yield by more than 14%. .
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Summer corn topdressing should be "light before and after light"