Corn balding refers to the phenomenon that the top of maize ear is not strong, and the grain is not full, and it is commonly called bald or bald, which seriously affects the yield increase of corn. The reasons for the baldness and the control methods are described below. Causes of baldness In addition to the genetic characteristics of corn varieties, the main reasons are the following: First, nutritional deficiencies. Phosphorus in the soil affects cell division. Especially during the elongation of the filaments, the lack of phosphorus filament elongation is slow and affects pollination. If the tip of the panicle is small and abnormally white, phosphorus and potassium are lacking, especially potassium deficiency. The second is the deterioration of spikelets. Spikelets at the tip of the ear, degenerative deformity, and sometimes male and female or male flowers develop and female flowers do not develop. Affects the normal pollination of corn and it is difficult to solidify. The third is the late development of filaments. The development of filaments at the tip of the ear is delayed, and silking is delayed. It is often not matched with pollination when the male flower is pumped, making it unable to seed. The fourth is dry and dry. The corn encounters drought during flowering and pollination, and the male flower and female flower bloom at long intervals, resulting in missed tassel loose powder during the elongation of the filament, resulting in poor pollination and fruiting effects. The fifth is excessive close planting. Excessive planting density results in poor ventilation and light transmission during the later growth period of the corn, which affects the normal growth of the corn. Sixth, the soil lacks trace elements. In the absence of boron in the soil, it has an adverse effect on the formation and pollination activity of male male pollen. In the absence of zinc, white spots appear on the old seedling leaves, and they rapidly enlarge to form local white areas and necrotic spots. Shortening between the sections also tends to cause abnormal growth and development of the ear, leading to baldness.
One of the prevention and treatment measures is selected varieties. It is necessary to select the suitable high-yielding, full-grained seeds and strong viable seed for local planting, and use air drying and seed dressing methods before sowing. The planting density is generally around 4,000, and the number of fields with poor fertility is appropriately increased, and the number of fields with good fertility is appropriately reduced. At the same time, it is best to use wide and narrow rows to avoid weak seedlings due to uneven fertilizer, water, and light. The second is reasonable fertilization. Fertilization should be combined with nitrogen, phosphorus, and potassium, and appropriate application of trace fertilizer. The land with low fertility has to be topdressed, but it is important to pay attention to it before it is too late to prevent it from ripening. To control the watering at the seedling stage, promote the differentiation of young panicles and shorten the time interval between male and female silking, increase the chance of pollination. Do the fertilization: reapply base fertilizer. Fertilize farmyard fertilizers and phosphorus and potassium fertilizers as much as possible. In medium fertility plots, 750-1000 kg of high-quality farmyard fertilizer, 6 kg of urea, 50-60 kg of superphosphate, 1.5-2 kg of zinc sulfate, and poorly fertility or good fertility fields should be applied to each acre. Apply more or less properly. Clever panicle fertilizer. Ten days before corn heading, which is often referred to as the big bell-mouth period, generally 25-30 kilograms of ammonium per acre is applied. When the ear starts to spit silk, 3 kilograms of urea are applied per acre. Spray zinc fertilizer. During the jointing stage of corn, uniform spraying of foliar was performed with 2% zinc sulfate solution. The third is pouring male flowering water. The first 15 days of corn tasseling are sensitive to water. When the soil moisture content of the drought is lower than 80% of the maximum water capacity in the field, it should be watered immediately. It is good for pollination and grouting of corn. The fourth is artificially assisted pollination. During the flowering period of corn, we should seize the time to dry in the morning after the dew, the male flower began to be a large number of loose powder. Pull rope method or shaking method can be used, once every 2-3 days, 2-3 times in succession, can prevent baldness. Http://
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