During the corn ear differentiation, the nutrient supply is insufficient; the temperature is not suitable, the temperature before and after the heading is higher than 35°C, the corn pollen is killed; the water imbalance, the large bell-to-flowering stage is the critical period of corn water demand, and the water shortage during this period leads to drought. The pollen amount is greatly reduced and the male and female are not adjusted; the pollen of Yanghua suffers from cloudy and rainy weather, which affects pollination and fertilization; the planting is too dense and the panicle differentiation is blocked, resulting in lack of grain and lack of granules; pests and diseases cause the premature decline of the functional leaves, and also make the rice grains empty. increase.
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