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The top of the corn ear is not strong and is called bald or bald. The number of corn kernels is reduced, resulting in reduced yield. The differentiation of the female florets, the silking and the grain formation of the middle and lower parts of the primordial ear of the maize, are then carried out simultaneously upwards or downwards, and finally at the top. In the case of environmental conditions, the top florets or fertilized embryos are often aborted due to insufficient nutrient supply. There are three common causes of baldness: First, the top florets degenerate into sterile flowers due to drought or insufficient fertilizer during differentiation. Second, before the tassel encounters high temperature and dry weather, the heading loose powder or the top filament is pulled out too late, losing the timing of fertilization, causing baldness. Third, the planting is too dense, the fertilizer is in short supply, or drought, or suffering from locust disasters, or encountering rainy weather, the photosynthesis of the leaves is weakened, and the fertilized embryo at the top of the ear does not have enough nutrients to develop into grains.
(1) According to the planting of corn plots, select suitable varieties. The hard-edged type of bald tip is lighter, while the dentate type is heavier. (2) Advocate the application of enzymes prepared by enzyme bacteria, such as agricultural music active organic manure, apply 250kg per 667m2, cover the soil after ditch application. The formula fertilization technology is used to strengthen the field management before and after flowering, and provide sufficient fertilizer and water conditions to ensure the supply of nutrients when the female flowers are differentiated. If necessary, spray Huimanfeng active liquid fertilizer or promote Fengbao, spray Shibao, Nongyiqing liquid fertilizer, Chuanfeng spleen high-efficiency amino acid liquid fertilizer. (3) Artificially assisted pollination of varieties or plants with late drawing. (4) Spraying Ma Zhuang Feng Ling, in the high-fat planting, late-maturing and high-yielding maize, the florets differentiation stage, that is, 3 to 5 days before the corn tassels or the tens of thousands of tassels just to be exposed and not yet exposed 27ml of corn Zhuangfengling, sprayed once for 20kg of clear water, can reduce plant height, rod position, shortening internodes, improve ventilation and light transmission conditions, prevent lodging, promote female flower development, increase double stick rate, avoid baldness , effectively preventing empty stalks and greed. (5) In addition, it can also spray 500-600 times of Wanjiabao.
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