1. Tassel inhibition of the ear. The tassels of corn are developed from the top buds and have a strong growth potential. Tassels differentiate 7-10 days earlier than the female ear, but the ear growth potential is weak. When the external conditions are not suitable, the tassels will be the ear of the female. Produce significant inhibition. When malnutrition occurs, tassels use the top growth advantage to absorb large amounts of nutrients to the top, resulting in empty stalks due to insufficient nutrition and poor development of the ear.
2. Malnutrition is poor. The lack of nutrient in the differentiation stage of maize ear, the smaller photosynthetic area and less accumulation of organic matter will make the ear development worse and lead to the increase of the empty stalk rate. In the prosperous period, if the mineral nutrition is too much, the nutrient grows vigorously and reproductive. The growth is weakened, and less organic matter is distributed to the ear, thereby forming empty stalks.
3. Fertilization is irrational. Under the condition of the same density fertility, the fertilization with less fertilization has more empty stalks, the lower the fertility, and the higher the density, the higher the empty stalk rate. The single-fertilizer had higher empty stalk rate than the formula fertilization, and the application of binary fertilizer was higher than that of using three-element fertilizer.
4. High temperature and drought effects. The period from the big bell mouth to the heading period is the period when the corn needs fertilizer and water. If the drought is lacking during this period, it will affect the normal flowering of the tassel and the extraction of the female filaments, causing the tasselling to be ahead of schedule and delayed silking, and the vitality of the pollen is weak. Filaments tend to wither, resulting in failure to pollinate and fertilize and empty stalks appear.
5. Too much rainy weather. In the period of corn powdering, if it encounters continuous rain and light, it will cause poor pollination and empty stalks.
In addition, pests and diseases can also cause empty stalks.
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