At present, the middle rice in Hubei Province enters the booting stage, and cotton is in the flowering stage, which is sensitive to high temperature. During this period, if the medium maximum temperature is above 35 °C and the minimum temperature is above 28 °C for more than three days, the flowering may be poor, the high temperature is not true, and the seed setting rate is decreased. The average temperature of the cotton flower is 30 °C or higher. This caused a large amount of shed bells to fall off, eventually leading to a reduction in cotton production.
According to the forecast of Wuhan Central Meteorological Observatory, it is expected that from July 26th to 27th, the eastern part of Hubei Province will be dominated by sunny and hot weather, and there will be short-term showers in the west, accompanied by strong convective weather such as thunderstorms and hail; July 28-8 On the 1st of the month, as the Western Pacific subtropical high further strengthened the west extension, most of the province will maintain a hot and humid weather of 36 ° C to 38 ° C. High temperature weather may cause "high temperature heat damage" to rice in early bloom and flowering in cotton.
High temperature heat damage is referred to as high temperature damage, which is caused by high temperature damage to plant (biological) growth and yield formation. It is generally caused by high temperature exceeding the upper limit temperature of plant (biological) growth, including high temperature damage and fruit tree wood burning. Livestock, poultry, aquatic products and fisheries, etc. The cause of heat damage is high temperature, because high temperature will make the plant chlorophyll lose its activity, hinder the photosynthesis from proceeding normally, reduce the photosynthetic rate, greatly increase the consumption, so that the intracellular protein will be agglutinated, the cell membrane is semipermeable, and the plant tissues are affected. Damage; high temperature can also reduce the ability of light contracted compounds to transport to the ear and grain, and reduce the activity of the enzyme, resulting in shortened grain filling period, imperfect grain, and reduced yield.
In view of the long duration and wide range of high temperature weather, China Xingnong.com recommends that all localities and departments should do a good job in heatstroke prevention and cooling, power dispatching management, and prevent high temperature and heat damage in farmland and do a good job of water storage and water retention. In the eastern part of Hubei Province, attention should be paid to shallow water irrigation to prevent high temperature heat damage during the heading stage of cotton; cotton should be watered in time for high temperature and drought, and the flower bell fertilizer should be applied to prevent premature senescence of functional leaves.
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