Nitrogen has a great influence on the growth and yield of corn. In the early stages of growth, the plants grew slowly and appeared yellow-green when nitrogen fertilizer was insufficient. In the vigorous growing stage, the nitrogen fertilizer was light green when it was insufficient, and then it turned yellow. At the same time, the lower leaves dried up, gradually reaching the midrib from the tips of the leaves, and finally dried up. However, excess N fertilizer can also affect normal growth. When sowing is used, excessive soluble nitrogen fertilizer is applied. Once a drought is encountered, the seeds will be damaged, affecting germination, and the emergence will be slow and untidy, and the emergence rate will be reduced. When nitrogen nutrition is too late in the late period, fertility is delayed, vegetative growth is flourishing, and actual fruit production is reduced. At the same time, due to more nitrogen, it promotes the synthesis of protein and consumes a large amount of carbohydrates. Therefore, the tissue is poorly differentiated, the epidermis is not fully developed, and it is easy to fall down.
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