At present, in the season of summer corn topdressing, according to the survey, many farmers’ friends still have misunderstandings on corn topdressing.
One of the misunderstandings: the topdressing is too late. Farmers are accustomed to topdressing before and after tasseling, but they do not know that they have missed the best time.
Misunderstanding 2: a shelling type of topdressing. When planting, put all the fertilizer into the fertilizer once, or sprinkle all the fertilizer when pouring the head water.
Misunderstanding three: Wangtian topdressing. Regardless of the characteristics of corn growth, wait for the fertilizer after the rain.
In all three cases, it is difficult to obtain high yields of corn.
Agricultural technology experts reminded that in order to obtain high yield of corn, first of all, we should understand the fertilizer requirement of corn: the corn seedling stage is the key period for phosphorus and potassium fertilizer, and the large bell period before the tassel is the critical period for nitrogen fertilizer. Secondly, the determination of the amount of fertilization should be based on the production of fixed fertilizer. Generally, the land with a yield of 700 kg per mu needs to be applied with 35 kg of urea, 15 kg of diammonium and 20 kg of potassium sulfate. The plot of more than 800 kg per mu should be added. Farmyard manure and micro-fertilizers such as zinc sulfate and borax. In addition, it is necessary to grasp the fertilization period and method. In the seedling stage, all the phosphorus and potassium fertilizers, about 20% of the nitrogen fertilizer and the zinc fertilizer should be applied as the base fertilizer (fertilizer). Studies have shown that the rational application of base fertilizer (fertilizer) can increase yield by about 15%.
In the period of large bell mouth, it is necessary to re-apply nitrogen fertilizer, about 60% of the total amount of nitrogen fertilizer should be applied. It is best to apply 20% nitrogen fertilizer after tasseling. It is best to apply or ditch the hole at a distance of 10~15 cm from the corn root. Do not apply it. If it is affected by drought, it should be combined with watering.
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