2. In ancient China, beginning of winter was divided into three stages: "When the water is still, the ice begins; The second waiting place began to freeze; Three times, people are drowning. " This solar water can already form ice; The land also began to freeze; In the third stage, pheasant refers to a big bird like pheasant, and pheasant is a big clam. After beginning of winter, big birds like pheasants are rare, but you can see big clams with similar lines and colors at the seaside. Therefore, the ancients thought that pheasants would become big clams in early winter.
3. The understanding of "beginning of winter" can't just stay in the sense of beginning of winter. Tracing back to the source, the ancient people's understanding of "establishment" is the same as that of modern people, both of which mean establishment and beginning. But the word "winter" is not so simple. In the ancient book "Twenty-four solar terms", the explanation of "winter" is: "Winter is the end, everything is harvested", which means that all the crops in autumn are harvested and put into storage, and all the animals are hiding and hibernating. It seems that the beginning of winter does not just mean the coming of winter. In a word, beginning of winter means that when winter begins, everything will be collected to keep out the cold.
4. In beginning of winter season, the sun has reached the longitude of 225, and the solar radiation in the northern hemisphere is getting less and less, because there is still a certain surplus of heat stored on the surface in summer and half a year, so it is generally not too cold. When there is no wind on a sunny day, there is always warm and comfortable "Xiaoyangchun" weather, which is not only very pleasant, but also very beneficial to the growth of winter crops. But at this time, the cold air in the north also has a strong force, often invading the south frequently, and sometimes it will form a cold wave weather with strong winds, cooling rain and snow. Judging from the average situation for many years, 1 1 is the month with the most cold waves. Severe cooling, especially abnormal cold and warm weather, has a serious adverse impact on people's lives, health and agricultural production. It is very important to pay attention to the weather forecast and do a good job in human body protection and crop cold injury and freezing injury prevention in time according to the weather change.
5. Before and after winter, the precipitation in most parts of China decreased obviously. Northeast China is frozen, and agricultural and forestry crops enter the wintering period; The "Sanqiu" in the Jianghuai area is coming to an end; Jiangnan is busy planting late-season winter wheat and transplanting rapeseed; On the other hand, South China is the best time to plant wheat in early winter. At this time, the water condition is closely related to the seedling growth and overwintering of crops. In North China and Huanghuai areas, when the average temperature of the day drops to about 4℃, and the soil in the field freezes at night and disappears during the day, we must seize the opportunity to water the winter water of wheat, vegetables and orchards, replenish soil moisture, improve the microclimate environment in the field, prevent "drought to help the cold" and reduce and avoid freezing injury. In Jiangnan and South China, it is an important measure to open the "high-yield ditch" in the field in time and do a good job in cleaning and drainage. In addition, after winter, the air is generally dry and the soil water content is reduced, so the fire prevention work in forest areas should be put on the important agenda.