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When do the four seasons start and end? According to astronomy, beginning of spring, Changxia, beginning of autumn and beginning of winter are beginning of spring, long summer, beginning of autumn and beginning of winter, among which beginning of spring is from the beginning of summer, from the beginning of summer to the beginning of summer, from the beginning of summer to the beginning of autumn, from the beginning of autumn to the beginning of winter, and from the beginning of winter to the beginning of spring. But now people are used to calling March to May as spring, June to August as summer, September to 165438+ 10 as autumn, and February to February of the following year as winter, so the criteria for dividing seasons can reflect the general climate, but it is not very accurate.

China has a vast territory and complex terrain, and there is a great temperature difference between the coastal and inland areas and between the north and the south. Most areas are located in the north temperate zone and subtropical zone, belonging to the East Asian monsoon climate zone. Hainan Island, Nansha Island, Xisha Island and Zhongsha Island are located at the southernmost tip of the motherland and belong to tropical climate. Qinghai-Tibet Plateau has a high terrain and belongs to a special plateau climate. /kloc-from September of 0/0 to March and April of the following year, winter winds prevailed in mainland China, and the weather was cold and dry. In winter, the temperature difference between north and south can reach more than 40 degrees. Compared with the same latitude areas in the world, the winter temperature in China is relatively low by 5 ~ 18 degrees from south to north. In summer, due to the influence of southwest warm and humid airflow, the temperature is high, the precipitation is high, and the temperature difference between north and south is small. Take July as an example, the temperature difference between Guangzhou and Harbin is only 6 degrees. Mohe, the northernmost part of Heilongjiang, has no summer all year round, while Hainan Island has only rainy season and dry season, and there are no four seasons. It's hot all year round. The Huaihe River Basin and the Yangtze River Basin have distinct seasons. In the south of Yunnan-Guizhou Plateau, such as Kunming, the seasons are like spring. In spring, March and April in the south are already warm in bloom, while the scenery in the north is still covered with snow, frozen for thousands of miles, and the snow is drifting in Wan Li. The weather in autumn is the most pleasant, with warm sunshine and crisp autumn air. September to 165438+ 10 is the golden season in Beijing.

There is a difference between seasons and seasons. Quarters are divided from the perspective of months. 1~ March is the first quarter, and April ~ June is the second quarter ... they know it very well. Here, 65438+ October, February ... 65438+ February actually refers to the arrangement of the Gregorian calendar, which is the calendar we usually watch. Besides the solar calendar, there is also the lunar calendar. Also called lunar calendar. There is a reference in the lunar calendar, and that is the moon. Everyone knows that. The moon on 15 is the roundest, then it will get smaller and smaller, and then it will become round ... This cycle is the lunar month. This year's Spring Festival falls on the first day of New Year's Day, which is equivalent to the lunar calendar 1 and the solar calendar on February 9. So the dates of the lunar calendar and the Gregorian calendar are inconsistent. After the general lunar calendar 1 month. If the lunar calendar is divided into four seasons, it should be closer to the four seasons.

According to the forecast of Fujian Climate Center, March is expected to be dominated by process weather, with slightly less precipitation than normal, slightly lower monthly average temperature, and great changes in monthly temperature, with obvious warming in the first half of the year and obvious low temperature process in the second half of the year. The main unfavorable periods generally appear in: late March to early March (9 ~ 13), late March to late March (19 ~ 25) and the end of the month, in which some counties and cities in the northwest will have mild cold weather from late March to late March for 4 ~ 5 days.

Suggestions on agricultural production:

1 and March are the concentrated sowing periods of early rice in Fujian province. All localities should reasonably arrange the sowing date of early rice. According to the principle of "the sowing date depends on the whole year, and the sowing date depends on the current situation", in the perennial sowing period of local early rice, combined with listening to the weather forecast, seeds are soaked at the end of the cold air process to accelerate germination, and when the temperature warms up, seeds are sown in sunny days to do a good job in cold protection in low temperature and rainy days. There are two obvious cold weather processes from September to 13 and 19 ~ 25, so it is necessary to cover the seedling field with plastic film and increase the application of hot phosphorus and potassium fertilizer to improve the cold resistance of seedlings and ensure their normal growth.

In February and March, as the temperature rises, the anchor likes warm vegetables. In early spring, it is suggested to cultivate vegetables in large and small sheds covered with plastic film to prevent seed rot caused by low temperature and rainy weather and ensure the smooth emergence and normal growth of seeds. According to the characteristics that high humidity is easy to induce waterlogging and diseases in spring rain season, agricultural technical measures such as high border cultivation, ditch cleaning and drainage should be adopted in vegetable garden management to strengthen the prevention and control of vegetable diseases and insect pests.

March and March are the planting seasons for fruit trees. All localities should seize the farming season and sow in time, rationally arrange according to the requirements of various fruit trees on environmental conditions, develop planting in suitable areas of planting division, and avoid blind planting. At the same time, do a good job in the inspection of orchard pests and diseases, and spray pesticides in time on sunny days; At the same time, do a good job in orchard fertilization to promote the growth and development of fruit trees.

April and March are the sowing seasons for spring soybeans and spring peanuts. There will be a process of low temperature and continuous rainy weather during the sowing period, which will make spring soybeans and spring peanuts germinate slowly, easily get sick and emerge unevenly. Pay attention to "cold tail and warm head", sow in sunny days, and cover with plastic film to keep warm, so as to ensure the smooth emergence of seeds and promote the growth and development of spring peanut and spring soybean roots.

In May and March, flue-cured tobacco enters the stage of slow seedling to root extension, and measures such as plastic film mulching should be taken to prevent early flowering in the process of low temperature and rainy weather; In rainy season, we should do a good job of ditch cleaning and drainage in tobacco fields to prevent water accumulation and promote root growth and development.

June and March are good seasons for afforestation, and saplings are easy to take root and survive after planting. All localities should seize the afforestation season and vigorously carry out afforestation activities.

In the spring ploughing season in July and March, the farm is busy, the use of fire in the field increases, and the sunny days with high fire risk level are prone to fire. Therefore, all localities should pay attention to strengthening the management of fire sources to prevent forest fires caused by spring ploughing and spring planting.