On the basis of applying the base fertilizer, spring corn should master the fertilization method of light, medium and heavy.
The former light refers to the fertilization before and after the jointing of the corn, and the jointing fertilizer is also called the stalk fertilizer. Generally, it is about 45 days after sowing. At this time, it is the corn stems and leaves that grow vigorously, and the tassels begin to differentiate. Topdressing can promote the increase of leaves in the ear position and ear position, increase the stem diameter, and promote the differentiation of panicles. Spring corn jointing fertilizer should account for 30% to 40% of the total amount of nitrogen topdressing. The amount of topdressing should be increased or decreased according to the soil fertility, the amount of base fertilizer and the growth of seedlings. If necessary, phosphorus and potassium fertilizers should also be applied during jointing.
Medium weight refers to the heavy trumpet period. In this period, top dressing can improve the seed setting rate and play the role of maintaining flowers and retaining grains. It is an important period for fighting large and large grains. The topping period of the big bell should account for 40% to 50% of the total topdressing amount of nitrogen.
After supplementation, refers to the topdressing during flowering and pollination. In the late spring, the corn needs more fertilizer. In order to prevent the de-fertilization, the late application of the granular fertilizer can enrich the grain and reduce the baldness. In this period, topdressing generally accounts for 10% to 20% of the total amount of topdressing, and supplementation can also take the method of root-spraying.
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