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On which day do the four seasons of spring, summer, autumn and winter begin and end? According to astronomy, the beginning of spring, the beginning of summer, the beginning of autumn, and the beginning of winter are the beginnings of spring, summer, autumn, and winter. Spring is from the beginning of spring to the beginning of summer, summer is from the beginning of summer to the beginning of autumn, autumn is from the beginning of autumn to the beginning of winter, and winter is from the beginning of winter to the beginning of spring. However, people now customarily refer to March to May as spring, June to August as summer, September to November as autumn, and December to February of the following year as winter. This standard for dividing seasons can reflect the general An overview of the climate, but not very precise.
Our country has a vast territory and complex terrain. There are great differences in temperature between the coast and the inland, and between the south and the north. Most of the areas are located in the north temperate zone and subtropical zone and belong to the East Asian monsoon climate zone; Hainan Island, Nansha, Xisha and Central Islands such as Shasha are located at the southernmost tip of the motherland and have a tropical climate; the Qinghai-Tibet Plateau is high and has a special plateau climate. From September and October every year to March and April of the following year, the winter monsoon prevails on the mainland and the weather is cold and dry. In winter, the temperature difference between the south and the north can reach more than 40 degrees. Moreover, compared with the same latitude areas in the world, the winter temperature in my country from south to north is relatively low by 5 to 18 degrees. Affected by the southwest warm and humid air flow in summer, temperatures across the country are generally high, precipitation is high, and the temperature difference between the north and the south is small. Taking July as an example, the difference between Guangzhou and Harbin is only 6 degrees. The northernmost Mohe region in Heilongjiang has no summer all year round, while Hainan Island only has rainy and dry seasons, no four seasons, and the weather is hot and hot all year round. The Huaihe River Basin and the Yangtze River Basin have distinct seasons. The southern part of the Yunnan-Guizhou Plateau is like spring in Kunming all year round. In spring, in March and April in the south, spring flowers are already blooming, but the scenery in the north is still snow-capped, with a severe winter weather of thousands of miles of ice and thousands of miles of snow drifting. The weather in autumn is the most pleasant, with warm sunshine and refreshing golden autumn. September to November is the golden season in Beijing.
There is a difference between quarter and season. Quarters are divided from the perspective of months, January to March is the first quarter, April to June is the second quarter... They are very clear. The January, February... and December here actually refer to the arrangement of the Gregorian calendar, which is the annual calendar we usually look at. In addition to the Gregorian calendar, there is also the lunar calendar. Also called the lunar calendar. The lunar calendar has a reference, and that is the moon. Everyone knows it. The moon on the fifteenth day is the roundest, and then it gets smaller and smaller, and then becomes round again... Such cycles are the months of the lunar calendar. This year's Spring Festival falls on the first day of the Lunar New Year, which is equivalent to January 1 of the lunar calendar and February 9 of the Gregorian calendar. Therefore, the dates of the lunar calendar and the Gregorian calendar are inconsistent. Generally, the lunar calendar will be more than one month behind. If the lunar calendar is also divided into four quarters, it should be closer to the four seasons.
The Fujian Provincial Climate Center forecasts that March is expected to be dominated by process weather, with slightly less precipitation than normal, slightly lower monthly average temperatures, larger temperature changes within the month, and a more obvious recovery in the first half of the month. , there will be a more obvious low temperature process in the second half of the month. The main unfavorable periods generally appear in: late early to early mid-March (9th to 13th), late to mid-late March (19th to 25th) and the end of the month, including some counties and cities in the northwest from late mid-to-late March. There will be 4 to 5 days of mild late-spring cold weather.
Agricultural production suggestions:
1. March is the intensive sowing period for early rice in Fujian Province. All regions should arrange the early rice sowing period reasonably. According to "the sowing period depends on the year-round, the sowing date depends on Based on the principle of "current", during the annual sowing period of local early rice, combined with listening to the weather forecast, soaking seeds to promote germination at the end of the cold air process, sowing in sunny weather when the temperature warms up, and doing a good job in cold protection during low-temperature, cloudy and rainy periods. There are two relatively obvious low-temperature weather processes from the 9th to the 13th and the 19th to the 25th. The rice fields should be covered with plastic film, and measures such as increasing the application of thermal phosphorus and potassium fertilizers should be used to improve the cold resistance of the seedlings and ensure the normal growth of the seedlings. .
As the temperature rises in February and March, vegetable anchors prefer warm vegetables. For early spring vegetable sowing and seedling cultivation, it is recommended to use large or small greenhouses covered with plastic films to prevent seeds from rotting due to low temperature and rain, and ensure smooth emergence and normal growth of seeds. Vegetable garden management should be based on the characteristics of waterlogging that may be caused in the spring rainy season and diseases easily induced by high humidity, and agricultural technology measures such as sorghum cultivation and ditch clearing and drainage should be adopted, and the prevention and control of vegetable diseases and pests should be strengthened.
March and March are the planting seasons for fruit trees. All localities should seize the agricultural season for timely planting. According to the requirements of various fruit trees for environmental conditions, they should make a reasonable layout and develop planting in suitable areas for planting zones to avoid blind planting. . At the same time, we will do a good job in inspecting orchard diseases and insect pests, and timely spray pesticides during sunny weather periods; at the same time, we will do a good job in fertilizing the orchards to promote the growth and development of fruit trees.
April and March are the sowing seasons for spring soybeans and spring peanuts. Low temperatures and continuous rainy weather during the sowing period will slow down the germination of spring soybeans and spring peanuts, and make them susceptible to diseases and uneven emergence. We should pay attention to the "cold tail and warm head", sow when the weather is clear, and cover with mulch to ensure the smooth emergence of seeds and promote the growth and development of the root systems of spring peanuts and spring soybeans.
In May and March, flue-cured tobacco enters the root-stretching stage from slow seedling to mass-tree growth. In low-temperature and rainy weather, measures such as mulching should be used to prevent early flowering; it is necessary to clear ditches and drain the tobacco fields during rainy periods. , prevent water accumulation and promote root growth and development.
June and March are good seasons for afforestation. Saplings are easy to take root and survive after planting. All localities should seize the afforestation season and vigorously carry out afforestation activities.
July and March enter the busy spring plowing season, and the use of fires in the wild increases. Fires are prone to occur during periods of high fire danger levels in fine weather. Therefore, all localities should pay attention to strengthening fire source management to prevent fires caused by spring plowing and spring planting production. forest fire.