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Since mid-November, most of the country's agricultural areas have been in good shape, and the soil surface deviations in parts of Huanghuai and Guangxi in North China. At present, most of the winter wheat in the northern part is in the tillering stage, and most of the winter wheat in the Jianghuai, Jianghan and Southwest regions is in the stage of seedling growth, and some winter wheat in Yunnan is in the tillering stage. Most of the rapeseed in the Yangtze River Basin is in the stage of seedling growth to transplanting.
Since mid-November, the temperature of most agricultural areas in the country is 1~4°C higher, the precipitation is less than 10mm, the light and heat conditions are better, the soil moisture is suitable, which is beneficial to the increase of effective tillering of winter wheat in the north, the growth of winter wheat and rapeseed in southern China. As well as the growth and development of agricultural vegetables and flowers in the facility; sunny days in the south of the Yangtze River and South China, it is beneficial to the harvesting of late rice, rapeseed transplanting and sugar cane accumulation, vegetable growth, citrus harvesting and winter harvesting. In southern Sichuan, southwestern Guizhou, and northeastern Yunnan, there are more rainy weather and insufficient light, which is not conducive to wheat seedling growth and rapeseed transplanting.
During the period, cold air activity was frequent, but due to the small temperature drop, the initial frost was almost close to normal years, and the cold air had little effect on the growth of wheat and rape. The average daily temperature in the northeastern part of northwestern China and the north and south of North China was 0~. At 6 °C, the wheat seedlings were slow; the average temperature in the southeastern part of the northwestern region, southern part of North China, and Huanghuai was 6-12 °C, and the wheat seedlings were normal.
According to the results of soil moisture monitoring on November 18th, the relative humidity of 10 cm soil in most parts of Shanxi, southern Hebei, northwestern Henan, and southern Shandong is below 60%, and the variation of surface enthalpy, the rooting of winter wheat and the formation of pre-winter strong seedlings There are disadvantages; the drought in the northern part of Anhui Province and parts of northern Jiangsu is heavier, and the sowing and emergence of winter wheat is affected. Some of the fields have uneven seedlings or small seedlings and weak seedlings; the soils in central and southern Guangxi are poor, which is not conducive to winter seed work. The development of the forest fruit is still growing normally due to the suitability of the bottom.
It is expected that in the next ten days, the cold air activities affecting China will be frequent, and the moving speed will be faster, affecting the north. There will be three cold air processes that have affected the northern regions of China, respectively, appearing from November 23 to 25 (medium-strong) 26th to 27th (medium intensity), 28th to 30th (medium weak).
Temperature trend: The temperature in the northern region is relatively large, and the temperature in the southern region is relatively stable. The average temperature in the eastern and northeastern regions of China is close to normal, and some regions are about 1 °C lower. The temperature in most other regions of China is 1 °C higher than normal. about.
Precipitation trends: precipitation in most parts of the northwestern region, western and southern North China, Huanghuai, Jianghuai, eastern and southern Jiangnan, and southern China are less than normal, and regions with deviations in northern China, Huanghuai and northern Jianghuai The drought will continue or develop. More rainy weather in the southwestern region and western Hunan.
Agricultural production advice:
1. Winter wheat in the north has gradually entered the stage of cold resistance exercise, and the wintering period is approaching. It is expected to be affected by cold air. From the 24th to the 25th, the cooling rate in Shanxi, Hebei, Beijing and Tianjin, most of Shandong, and northwestern Henan will be 5~9°C, and the minimum temperature will reach minus 10°C to 0°C. Lyricism and seedlings strengthen field management, pouring overwinter water before the advent of cold air, preventing freezing and keeping warm, ensuring that wheat is safe for winter.
2. In the southern winter wheat and rapeseed areas, it is necessary to strengthen the management of water and fertilizer in wheat and rapeseed seedlings, timely cultivating and cultivating soil, re-applying organic fertilizer, promoting the formation of strong seedlings and improving cold resistance. Fields that have already experienced drought in northern Anhui and northern Jiangsu should be irrigated in time, and timely slashed, ventilated and protected, promote root growth of wintering crops, and strive to form strong seedlings before winter. The areas with excessive soil moisture in the southwestern region should be ploughed in time to ensure the stable growth of winter wheat and rapeseed and the smooth transplanting of rapeseed, and to monitor and control pests and diseases.
3. In the south and south of the Yangtze River, water storage should be paid attention to ensure the normal growth of economic crops.
4. All localities should strengthen the management of facility agriculture, adopt measures such as wind-proof reinforcement and cold-proof and warmth to prevent the occurrence of freezing damage; the northern region should do a good job in cold-keeping and warm-keeping of animal husbandry to avoid freezing of young animals.
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