"I am afraid of dry hot air, together with this wind (dry hot air) must reduce production", "dry hot air is affected by the filling stage, a wind (dry hot wind) wind wheat dry quickly, the pulp is not good, may reduce production." The old farmer in the wheat field of Zhengding County, Shijiazhuang, Hebei, told reporters worried about the wheat.
According to the monitoring of the Hebei Provincial Meteorological Observatory at 14 o'clock on the 18th, the temperature in the middle and southern parts of Hebei Province is between 30-36 °C, and the highest temperature occurs in the county of Shu, reaching 36 °C. The relative humidity of the air in the wheat area is about 15%, accompanied by southwest wind 3-4, there is mild dry hot wind, and some dry wheat hot air in the southern part of the wheat area appears. It is expected that there will be thunderstorms or sporadic showers in most parts of Hebei in the next few days, which will have a positive effect on increasing the relative humidity of the air and relieving dry and hot winds.
Dry hot wind is a kind of comprehensive agrometeorological disaster with high temperature and low humidity accompanied by certain wind power in the late growth stage of winter wheat. According to the degree of harm, it is divided into mild and severe. Light dry hot air means: daily maximum temperature ≥ 32 ° C, air humidity relative humidity ≤ 30% at 14 o'clock, wind speed ≥ 2 m / s at 14 o'clock; heavy dry hot air means: daily maximum temperature ≥ 35 ° C, 14 o'clock air relative humidity ≤ 25%, 14 o'clock wind speed ≥ 3m / s.
Wei Ruijiang, senior engineer of Hebei Meteorological Research Institute, said that at present, winter wheat in Hebei Province is in the filling stage and is also a key stage in the formation of yield. Grain filling now requires certain meteorological conditions, and if the temperature is too high or too low, it is not good for its grouting. If the temperature reaches 33 ° C or more, and the air humidity is small, then there is a certain wind force to easily form dry hot air. This is not good for winter wheat grouting.
Experts suggest that the current defense against dry hot air is mainly through the use of field watering methods to improve the field microclimate, in addition, through leaf fertilization, regulate plant metabolism, enhance the ability to resist dry hot wind.
According to the Hebei Provincial Meteorological Observatory, there will be thunderstorms or sporadic showers in most parts of Hebei in the next few days, which has a positive effect on increasing the relative humidity of the air and relieving dry hot air. The specific forecast is as follows:
Today, during the day to night, Zhangjiakou, Chengde, northern Tangshan, and northern Qinhuangdao have cloudy showers or sporadic showers. Shijiazhuang and southern Juzhou have cloudy and cloudy rain, and other areas are cloudy and sunny.
On the 21st, the northeastern part of the country turned cloudy and sunny, and other areas were cloudy.
Meteorologists remind farmers that during the thunderstorm, there will be strong convective weather such as short-term winds and hail in individual locations, which will cause certain damage to the maturity of winter wheat. Relevant units and farmers must pay attention to prevention.
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