Maize's baldness and lack of grain are the main factors that cause a reduction in production, and the reduction in production can reach 10% to 15% or more. The main reasons and preventive measures that will cause corn baldness are described below:
One, the main reason
1. Too much density causes malnutrition.
2. In the late stage of female ear differentiation, the adverse factors such as drought or cloudy rain and oviposition caused poor differentiation or degradation of the top florets.
3. Tae-Tung encounters high temperature and drought before the flowering period of the male and female causes the top filiform to be pollinated.
4. In the rainy season after pollination, the top filaments could not be pollinated and bald, lacking grains.
Second, preventive measures
1. Repeated application of heading fertilizer to top-dressing with ammonia fertilizer is the best. Before and after the jointing to heading, that is, before and after 11 leaves, 11~14 kg urea per acre is used for extra-root dressing. At the same time, the beginning of silking at the ear, each Acres again applied 3 kg of urea as attacking grain fertilizer.
2. Foliar application of zinc fertilizer During the jointing period to the big bellmouth stage, spraying 2% of zinc sulfate fertilizer liquid on the foliar surface for 1 or 2 times can reduce the phenomenon of baldness, lack of grain, and increase grain weight.
3. Interlaced castration and artificial pollination At the earliest stage of corn heading, the tassels are removed alternately, and the yield can generally be increased by more than 10%. Pollination should be carried out within 1 to 5 days. After the dew had dried at 8 to 11 am, artificial pollination was performed using a pull string method or a shaker method, once every two days, and consecutively for 3 times.
4. Timely drought relief. In the middle and late stages of corn growth, if there is rainy weather and the water capacity in the field exceeds 80%, it is necessary to drain water and prevent flooding to prevent premature corn aging. In case of drought before picking, timely watering to avoid "card neck drought."
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