Some peasant friends have matured the pulp as soon as possible and harvested it as early as possible. They then ripen the corn in the later stages of corn growth. In fact, this is very unscientific, and reducing the corn will reduce grain weight and reduce yield. According to comparison, in the mid-corn wax ripening stage, the yield was reduced by 24.8% and the 100-grain weight was reduced by 6.9 g. This is due to the fact that the number of ears per mu and the number of grains per ear have no longer changed in the late growth stage of corn, and only grain weight is affected. If the tip is too early and heavy, the upper green leaves are removed and the lower leaves are yellow again. The source of photosynthesis products is cut off and the grouting process stops. In addition, although the photosynthetic area was reduced in the later growth stage of corn, some of the nutrients produced earlier were stored in the culms. After the shoots were removed, this part of the nutrients could no longer be transported to the grain, resulting in insufficient grain and reduced yield. Therefore, in order to ensure the increase of yield and yield of corn, avoid ripening at the late stage of corn growth.