What are the characteristics of rain solar term phenology?

The ancients in China divided the fifteen days of the rain solar term into three periods: one is to wait for Rex to sacrifice fish, the other is to wait for geese to come, and the third is to wait for vegetation to sprout. It is said that the solar term of rain has come, the ice on the water surface has melted, and otters have started fishing. Otters like to kill the fish and put them on the shore in turn, just like offering sacrifices, so there is a saying that "Rex sacrifices fish". Five days later, the geese began to fly back to the north from the south. In five days, with the sun be the spirit rising in the earth, vegetation will begin to sprout, and the earth will gradually begin to show a thriving scene.

The rainy season means that it begins to rain and the rainfall gradually increases. In the Yellow River valley, the birthplace of the 24 solar terms, it was cold before the rain, but it was snowing and raining unpleasantly. After the rain, the temperature can generally rise above 0℃, with less snow and more rain.

However, in the warm southern region, even in the dead of winter, rainfall is not uncommon. The average temperature in most parts of southern China in this period is above 10℃, peaches and plums are in bud, and cherries are in full bloom. It is indeed a climatic spring. In addition to a few years, the frost period has come to an end. It is timely to graft fruit trees and plant trees.

The weather characteristics of rain solar terms have great influence on the growth of overwintering crops. An agricultural proverb says, "Rain and dew are good crops, and Da Chun Koharu is a treasure." "Spring is getting warmer and warmer, and the rain is busy." According to the weather characteristics, the vast rural areas should carry out weeding and fertilization on the middle tillage such as Sanmai, clear ditches and bury soil moisture to prepare for drainage and waterlogging prevention.