Summer corn dressing should be "before and after light"

The whole growth process of corn is divided into three stages: seedling stage, panicle stage and anthesis stage. The absorption of nitrogen, phosphorus, and potassium is different in different stages, with the most nitrogen, followed by potassium, and less phosphorus. For summer corn, nitrogen is absorbed earlier and absorbed faster. Nitrogen absorption at the seedling stage accounts for 10% of the total, absorption at booting stage is 76%, absorption at heading to maturity is 14%; phosphorus absorption is also earlier, 10% at seedling stage, and 62% at jointing and booting stage , Heading fertilization and grain formation period absorption of 28%; for potassium, more than 70% before heading was absorbed, heading fertilization absorbed 30%. It can be seen that the absorption of nitrogen, phosphorus, and potassium in corn shows a low seedling period, a significant increase in the jointing period, and the requirement for the highest peak of the requirement fertilizer from booting to heading. Due to tight planting time, it is particularly important to apply seed fertilizers and topdressing fertilizers because the summer corn cannot be set and the base fertilizer is applied. Fertilizer: nitrogen, phosphorus, potassium compound fertilizer or diammonium phosphate as the best seed fertilizer, 10-15 kg per mu can be used, open ditch or planing hole applicator, and stir with soil and then sow, or first with seedlings Fertilizer, sowing seeds next to the ditch, so that species, fertilizer isolation, to avoid beaker seeds. Top dressing: Dressing should be carried out in two different ways, using "before and after light". First, dressing fertilizer during the jointing period accounts for 60% of the total fertilizer, and 15-20 kg of urea is applied. The second is to top up the big bell mouth fertilizer, top dressing fertilizer accounted for 40%, Mushi urea 10-15 kg. Practice has shown that summer corn can be increased by more than 12% by using “pre-heavy-light-light” method compared to “before light and heavy”; top-dressing can be increased by more than 14% for “top-heavy” fertilizers in different phenological phases. .

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