Symptoms: The top of a corn ear is not known as bald or bald. The decrease in the number of corn grains per ear resulted in a reduction in production.
Etiology: Maize floret differentiation, silking, and kernels form the middle and lower part of the ear of the primordium, and thereafter proceed upward or downward simultaneously from this point, and finally end at the top. In case of unfavorable environmental conditions, the top florets or fertilized embryos are often aborted due to insufficient supply of nutrients. There are three common causes of baldness: First, the top florets are degraded into sterile flowers due to drought or fertilizer shortage during differentiation. The second is that before tasselling encounters hot and dry weather, heading loose powder is taken out in advance or the top of the filaments is drawn out too late, and the timing of fertilization is lost, resulting in baldness. Thirdly, the planting is too dense, the supply of fertilizer is in short supply, or drought, or suffers from floods, or even in rainy weather, the photosynthesis of the leaves is weakened, and the fertilized embryos at the top of the ear cannot get enough nutrients and cannot develop into grains.
Control methods:
(1) According to the cultivation of corn plots, select suitable varieties. Hard-bite breeds appear to be lighter, while dents are heavier.
(2) Advocate the use of compost made from enzyme bacillus, such as organically active manure, applying 250kg per 667m2, covering the soil after the ditch. Formula fertilization technology is used to strengthen field management before and after flowering and provide sufficient fertilizer and water conditions to ensure nutrient supply during female flower differentiation. If necessary, spray Huimanfeng active liquid fertilizer or promote Fengbao, spray Shibao, Nongyiqing liquid fertilizer, Chuanfeng spleen high-efficiency amino acid liquid fertilizer and so on.
(3) Artificially assisted pollination of late varieties or plants.
(4) Spray corn Zhuang Feng Ling. For specific methods, see corn empty stalks.
(5) In addition can also spray Wanjiabao 500-600 times liquid.
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