In the process of corn planting, due to factors such as poor growth environment, there are often no knots and no seeds. Some ears have no seeds from the base to the top of the whole line, and the ears are bent toward the missing side to form banana mites. Some have no grain at the top, some are bald; some have no grain at the tail, and are bald-tailed; while some of the whole ear has only a few scattered and scattered, and severely formed empty ear, which has a great impact on corn yield. The specific reasons for the non-seeding of corn include the following:
　　 1. Insufficient nutrient supply during the ear of corn.
　　 2. The temperature is not suitable. Before and after heading, the temperature was higher than 35 °C, and the corn pollen was killed, which affected fertilization and caused it to be not strong. The temperature at the late stage of grain filling is lower than 16 °C, which affects the accumulation of dry matter and causes granules.
　　 3. Water imbalance. From the big bell to the flowering stage, it is the critical period of corn water demand. In this period, the water shortage is met with drought, which is called “card neck droughtâ€. "Card neck drought" will cause the tassels to pull out slowly or the tassels that have been withdrawn will die dry, resulting in a significant reduction in pollen and male and female imbalance. Drought and no rain before and after tasseling, resulting in tassel flowering and earing stage of the earing or postponement, the ear and tassel flowering period is not met.
　　 4. When the flowers are scattered in the rainy weather, the tassels cannot bloom normally, and some pollen expands and ruptures or sticks into a group and loses vitality, which affects the normal conduct of pollination and fertilization.
　　 5. The planting is too dense, the ventilation and light transmission in the field is poor, the growth and development of corn is poor, and the differentiation of the ear is blocked, resulting in lack of grain.
　　 6. Pest and disease hazards. The corn flower grain stage is endangered by corn borer, aphid, armyworm and leaf spot, black powder disease and other pests, leading to premature senescence of functional leaves, which will also increase corn empty mites and severely form empty ears.
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