In recent years, there has been a strange phenomenon of short bracts in corn in many places! The specific manifestation is: the length of the corn shaft is normal, but a part of the shaft is exposed and not wrapped by the bracts. The length of bracts in some plots is only one-third of the length of ears; in some plots, bracts are half the length of ears, and there are basically no grains on the exposed shaft!
The scientific name of maize incomplete bracts is "corn dew top". Maize dew top refers to that the bracts of the female ear of maize are shorter than the cob, which cannot cover the cob and exposes a part of the cob. Because the bracts are short, the grains are exposed, which affects the grain filling and leads to a reduction in yield. In addition, short bracts are prone to insect pests, such as the double-spotted firefly beetle biting the silk and the chafer biting the grain, which can also cause a reduction in production. The "corn outcropping" that occurred in previous years will seriously affect yield, so farmers should take precautions early to avoid losses.
What causes the short corn bracts
1. Drought and water shortage: The jointing period is the period of corn ear differentiation. The high temperature and drought during the jointing period will cause the differentiation of bracts and ears to be out of sync, resulting in short bracts.
2. Weather reasons: rainy weather, insufficient light and temperature, reduced photosynthesis, resulting in slow growth of bracts, insufficient growth, and less than the proper length, but the ears grow normally beyond the bracts, resulting in dew.
3. Excessive dense planting: Excessive planting density causes poor ventilation and light transmission conditions in the later stage of corn growth, which affects the normal growth of corn.
4. Soil lack of micronutrient fertilizer: When the soil lacks boron, it will adversely affect the formation of maize male flower pollen and the activity of pollination. When zinc is deficient, white spots appear on the leaves of old seedlings, and they expand rapidly to form local white areas and necrotic spots. The internodes are shortened, and the growth and development of ears are also easily deformed.
How to prevent the occurrence of short corn bracts
1. Strengthen fertilizer and water management: First, apply ear fertilizer early, and apply ear fertilizer well before and after tasseling. The second is drought prevention. When the female ears emerge, there should be no shortage of water to ensure the normal growth of bracts.
2. Pay attention to the selection of varieties: It is generally believed that the red-shaft corn varieties have relatively poor high temperature tolerance (the American line is the most sensitive, and the Asian and European lines are relatively better). When high temperature is encountered, "the ears and bracts cannot be covered" or even "grain missing" "And severe "balding" phenomenon, resulting in reduced production.
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