What does Lesser Cold mean by solar terms?

Lesser Cold is not only the 23rd solar term in the 24 solar terms of the lunar calendar, but also the fifth solar term in winter, marking the official beginning of the winter season. the sun reaches 285C in longitude. For China, Lesser Cold marks the beginning of the lowest temperature solar term of the year. Only in a few years, the temperature of Greater Cold is lower than that of Lesser Cold. Let's take a look at what Lesser Cold solar terms mean.

What does Lesser Cold mean by solar terms?

When the sun's longitude reaches 285C, Lesser Cold's solar terms begin, marking the beginning of the coldest day of the year. Cold is cold. Lesser Cold indicates the degree of cold. Cold air cools frequently, but not many people reach the standard of cold wave. As the saying goes, "cold in 39", and "39" mostly from January 9 to 17, also happens to be within Lesser Cold's solar terms, but this is only a general rule. Greater Cold may also be colder than in a few years.

Climatic characteristics of Lesser Cold's solar terms

When Lesser Cold, the average temperature in Beijing is generally around-5 ℃, the extreme minimum temperature is below-15 ℃, the average temperature in the northern part of Northeast China is about-30 ℃, the extreme minimum temperature can be as low as-50 ℃, and the average maximum temperature in the afternoon is only-20 ℃. The average temperature in Heilongjiang, Inner Mongolia and the north of * 45 °N and the northern Tibetan Plateau is about-20 ℃, and the average temperature in the west of Hetao near 40 °N is about-10 ℃. To the Qinling Mountains and the Huaihe River, the average temperature is about 0 ℃. There is no seasonal permafrost to the south of this line, and there is no obvious overwintering period for winter crops. At this time, the average temperature in the south of the Yangtze River is generally around 5 ℃. Although the fields are still full of vitality, there is also cold air moving south from time to time, causing some harm.

Lesser Cold's Solar terms and Agricultural production

1. During the Lesser Cold season, except in the southern region, attention should be paid to applying winter fertilizer to wheat, rape, and other crops, while Hainan and most parts of South China mainly do a good job in preventing cold and freezing, accumulating fertilizer and building water conservancy projects. On the basis of pouring frozen water before winter, applying sufficient winter fertilizer and cultivating soil and roots, artificial mulching is also an important measure to prevent frost injury of agricultural and forestry crops in cold winter.

2. When the cold wave becomes a strong cold air, pouring dilute dung water and removing plant ash can effectively reduce the harm of low temperature to rape. Crop straw and rice straw can be sparsely scattered on the vegetable bed in open field as long-term mulch in winter, which not only does not affect the light, but also reduces the wind speed among vegetable plants, blocks the ground heat loss, and has the effect of heat preservation and anti-freezing.

3. When the low temperature comes, the cover will be thickened and covered temporarily, and then removed in time after the low temperature. Vegetables in the greenhouse should shine as much as possible at this time, even if there is rain and snow and low temperature weather, the mulch outside the shed should not be uncovered for many days in a row, so as not to affect the normal photosynthesis of the plant, cause lack of nutrition, and cause plant wilting and death when the weather is fine and unveiled.

4. Alpine tea gardens, especially those which are vulnerable to cold wind in the northwest, should be covered with straw, weeds or plastic film to prevent the direct harm of withered shoots and sandstorms to leaves caused by wind. After snow, you should shake off the snow on the branches of fruit trees as soon as possible to avoid breaking the branches caused by strong winds.

5. Lesser Cold should continue to do a good job in the cultivation of spring flower crops, do a good job in anti-freezing and moisture prevention, and strive for a good harvest of spring flowers. To prevent snow, freezing rain and bamboo trees, foggy and windy days in winter, fishing and aquaculture operations at sea or rivers and lakes should pay special attention to safety.