Today is the eleventh section of the twenty-four solar terms, "small heat", which is a small heat on July 7 or 8 every year when the sun reaches 105°. The heat means hot, and the heat is not too hot. . It means that the weather is getting hot, but it has not yet reached the hottest, and most of the country is basically in line. At this time, the country's crops have entered a stage of growth and need to strengthen field management.
Before and after the summer, in addition to harvesting winter and spring wheat crops in the northeast and northwest regions, agricultural production is mainly busy in field management. Early rice is in the late filling stage, and early-maturing varieties must mature before harvesting, and the field should be kept dry and wet. The mid-season rice has been jointed and entered the booting stage, and the panicle fertilizer should be applied according to the growth trend. The single-season late rice is being divided, and the tiller should be applied as soon as possible. Double night seedlings should be controlled to control pests and diseases, and they should be given “send marriage fertilizer†5-7 days before planting. “The heat in the small summer is hot, and the cotton pruning does not stop.†Most of the cotton in the cotton area begins to flower and ring, and the growth is the most vigorous. In the process of re-applying the flower and bell fertilizer, it is necessary to pruning, smashing and removing the old leaves in time to coordinate the nutrient distribution in the plant. It enhances ventilation and light transmission, improves group microclimate, and reduces bud ringing. High temperature in summer is a season in which a variety of pests such as aphids and spider mites bloom. Controlling pests and diseases in a timely manner is another important link in field management. "Summer corn enters the tasseling period. In addition to requiring sufficient light and heat conditions, the requirements for water are particularly urgent. Pay attention to water and fertilizer management and pest control. Arid areas should be irrigated in time to avoid the occurrence of corn "cage drought". Poultry farming should pay attention to heatstroke prevention and cooling, fish ponds should be properly placed in the bait to prevent water quality deterioration and lack of oxygen in the water. Livestock heatstroke, chicken house cleaning.
At the beginning of the small summer, the Meiyu in the Jianghuai River Basin has ended. The southeastern part of the Huaihe River and the Qinling Mountains in the eastern part of China has started the southeast monsoon rainy season from the Pacific Ocean. The precipitation has increased significantly and the rainfall is relatively concentrated. South China, Southwest China and the Qinghai-Tibet Plateau are also from the Indian Ocean and China. In the southwestern monsoon rainy season of the South China Sea, the middle and lower reaches of the Yangtze River are generally high temperature and low rainfall under the control of subtropical high. The frequent occurrence of drought has a great impact on agricultural production, and it is very important to store water and drought early. The farmer said: "The rain in the sky, the rice in the pot", the thunderstorms that occur at this time, the precipitation caused by tropical storms or typhoons are very beneficial to the growth of rice and other crops, but sometimes they also give dry crops such as cotton and soybeans. Vegetables have an adverse effect.
In some years, the cold air force in the north is still strong before and after the summer heat. In the middle and lower reaches of the Yangtze River, the warm air in the south is evenly matched, and there is a frontal thunderstorm. "Small heat is a thunder, and it is reversed to make Huangmei." The thunderstorm in the summer heat season is often the weather information of "pour Huangmei". The rainband will also remain in the middle and lower reaches of the Yangtze River for a period of time.
The average temperature in the southern part of the country is about 26 °C, which is already very hot in summer, but it has not yet reached the hottest time. In mid-July, in the low-altitude valleys of southeastern China, the daily average temperature is higher than 30 °C, and the daily maximum temperature is higher than 35 °C. This is unfavorable for hybrid rice. In addition to the fact that this factor should be fully considered in the layout, the corresponding remedial measures should be taken. In the northern part of the northwestern plateau, frost and snow are still visible at this time, which is equivalent to the early spring of South China.
During the summer heat season, the western part of southern China has entered the most rainy season. The number of rainstorm days in July and August can account for more than 75% of the whole year, usually about 3 days. In places where the terrain is undulating, there are often flash floods and even mudslides. However, in the eastern part of South China, after the summer heat, it was often controlled by the subtropical high, and it was more and more sunny and hot weather, and began to enter the drought period. The climatic characteristics of this eastern arid sorghum in most parts of southern China have a great relationship with agricultural abundance. It is necessary to adopt drought and flood control measures as soon as possible to minimize the harm. As well as paying attention to the disaster caused by thunderstorms, thunderstorms often accompany high winds and heavy rains, and sometimes hail, which is prone to disasters.
It is estimated that in the next 10 days (July 7-16), China's main rainfall areas are located in the southeastern part of the northwestern region, North China, Northeast China, Huanghuai, Jianghuai, Jiangnan, and the north along the Yangtze River, the southwestern part of the country, and southern China. The total rainfall is generally 30. -60 mm, of which some areas of Huanghuai, Jianghuai, Hanshui River Basin, Sichuan Basin and South China Sea Coast have 80-180 mm.
Main weather process:
On July 7-8, there were heavy rains in parts of southwestern Hubei, eastern Guizhou, northwestern and central and western parts, western Hunan, southern Anhui, southern Jiangsu, etc., including heavy rains in southwestern Hubei, western Hunan, and northeastern Guangxi. (100-130mm).
From July 7 to 9, there were small to moderate rains in the northern and northeastern parts of northern China, with heavy rains in parts of northeastern and northeastern Inner Mongolia.
On the 10th to 10th, there will be small to moderate rains in North China, Northeast China, Huanghuai, Jianghuai, Hanshui River Basin, Sichuan Basin and South China. Some areas in the northern Sichuan Basin, Huanghuai, South East China and South China have large areas. To heavy rain.
On the 13th to 16th, there will be a rainfall process in the northwestern part of the northwest, north China, northeast, and Huanghuai.
Focus:
Multiple rainfall in eastern and northeastern China
In the next 10 days, there will be multiple rainfalls in eastern and northeastern China, and the main rainfall periods will appear on 7-8 and 10-16 days.
Large-scale hot weather will occur in Jiangnan and South China.
July 7-9, the middle and east of Jiangnan. Most of South China will have a high temperature with a maximum daily temperature of 35-36 °C. On the 8-10th, some areas in North China, Huanghuai and other places will have a high temperature of 35-36 °C.
tropical wind
In the next 10 days, the tropical convergence zone will be active, and two tropical storms will be formed in the northwestern Pacific Ocean. One of them will affect China's South China coast or southeast coastal areas.
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