Maize male flowers begin flowering 2 to 5 days after the tassels are removed. The flowering sequence starts from the middle florets on the main shaft and then goes up and down at the same time. The branching floret open sequence is the same as the main axis. 2 to 5 days after flowering is a flowering period, when the number of open flowers accounted for 80% to 90% of the total flowers. It usually takes 7 to 9 days to complete flowering. There are 1600-4000 flowers per panicle, each flower has 3 anthers, and each anther has 2500 pollen. The pollen amount per spike was 1.63-5.83 g. The pollen was light yellow at first and became dark yellow after losing its vitality.
The main factors affecting the flowering and loosening of corn tassels are temperature and humidity. Appropriate maize flowering temperature is 25-28 °C, suitable relative humidity of 65% to 90%. Under conditions of appropriate temperature and humidity, corn tassels have flowers opening throughout the day, generally flowering at 7-9 am, decreasing in the afternoon, and less at night. When the temperature is above 35°C, the pollen will quickly lose its vigor, or the anthers will not crack normally; looser than 38°C, it will not bloom. When the temperature continues to exceed 30°C and the relative humidity is below 60%, little flowering occurs, and the ear can not be fertilized normally, resulting in severe deficiencies, resulting in reduced production. This phenomenon of pollen loss due to high temperature and drought pollen is called high temperature killing. The recent continuous high temperature weather in the province has seriously affected the flowering and loosening of corn, and the seed setting rate will be significantly reduced.
Under normal conditions, the female ear filaments of the corn generally begin to elongate 1 to 5 days after the first flowers of the male flower. The florets at the base of the ear were spilt first, then stretched upwards and downwards, with the earliest at the top. Maize filament fertilization capacity can generally be maintained for about 7 days, in order to fertilize after 2-5 days after silking. After 7 to 9 days of silk threading, the energy of the style deteriorated, and almost 11 days lost fertilization. Filaments stop growing after fertilization and brown and wither after 2 or 3 days. Corn heading and flowering in severe drought or continuous hot weather, not only lead to less tassel flowering and loose powder, but also lead to delay in female ear spinning, so that the flowering period is not good, resulting in low rate of pollination and fertilization.
Summer corn is in the period of drawing and silking, which is the period most sensitive to high temperatures. In order to reduce the harm caused by high temperature to this part of summer corn, conditions such as irrigation and cooling, artificially assisted pollination, foliar spraying and other measures are available. Irrigation can improve the microclimate in the field, reduce the inter-plant temperature l ~ 2 °C, increase the relative humidity, and effectively reduce the high temperature hazards. Artificially assisted pollination increased the amount of pollen falling on the stigma and increased the seed setting rate. Use urea, potassium dihydrogen phosphate or other high-quality foliar fertilizers for multiple sprays to increase the water in the ear of the plants, which can reduce temperature and humidity, promote loose powder, and provide water and nutrients to the leaves. Note that the concentration of fertilizer cannot be large. Through the Internet search "pollination essence", can find some companies sell information about related products, mostly containing some growth regulators or multiple nutrient products, claiming to improve pollination fertilization rate, pay attention to distinguish between true and false before buying.
The main factors affecting the flowering and loosening of corn tassels are temperature and humidity. Appropriate maize flowering temperature is 25-28 °C, suitable relative humidity of 65% to 90%. Under conditions of appropriate temperature and humidity, corn tassels have flowers opening throughout the day, generally flowering at 7-9 am, decreasing in the afternoon, and less at night. When the temperature is above 35°C, the pollen will quickly lose its vigor, or the anthers will not crack normally; looser than 38°C, it will not bloom. When the temperature continues to exceed 30°C and the relative humidity is below 60%, little flowering occurs, and the ear can not be fertilized normally, resulting in severe deficiencies, resulting in reduced production. This phenomenon of pollen loss due to high temperature and drought pollen is called high temperature killing. The recent continuous high temperature weather in the province has seriously affected the flowering and loosening of corn, and the seed setting rate will be significantly reduced.
Under normal conditions, the female ear filaments of the corn generally begin to elongate 1 to 5 days after the first flowers of the male flower. The florets at the base of the ear were spilt first, then stretched upwards and downwards, with the earliest at the top. Maize filament fertilization capacity can generally be maintained for about 7 days, in order to fertilize after 2-5 days after silking. After 7 to 9 days of silk threading, the energy of the style deteriorated, and almost 11 days lost fertilization. Filaments stop growing after fertilization and brown and wither after 2 or 3 days. Corn heading and flowering in severe drought or continuous hot weather, not only lead to less tassel flowering and loose powder, but also lead to delay in female ear spinning, so that the flowering period is not good, resulting in low rate of pollination and fertilization.
Summer corn is in the period of drawing and silking, which is the period most sensitive to high temperatures. In order to reduce the harm caused by high temperature to this part of summer corn, conditions such as irrigation and cooling, artificially assisted pollination, foliar spraying and other measures are available. Irrigation can improve the microclimate in the field, reduce the inter-plant temperature l ~ 2 °C, increase the relative humidity, and effectively reduce the high temperature hazards. Artificially assisted pollination increased the amount of pollen falling on the stigma and increased the seed setting rate. Use urea, potassium dihydrogen phosphate or other high-quality foliar fertilizers for multiple sprays to increase the water in the ear of the plants, which can reduce temperature and humidity, promote loose powder, and provide water and nutrients to the leaves. Note that the concentration of fertilizer cannot be large. Through the Internet search "pollination essence", can find some companies sell information about related products, mostly containing some growth regulators or multiple nutrient products, claiming to improve pollination fertilization rate, pay attention to distinguish between true and false before buying.
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