What is the solar term "in the middle of March, after the rain ... cover the valley and sow at this time"?

Grain Rain originated from the old saying "Rain gives birth to a hundred valleys".

"Twenty-four solar terms" records: "In mid-March, after the rain, the soil paste pulsates, and now it rains, and its valley is in the water ... At this time, the valley is covered and planted, from top to bottom. Grain Rain linked "valley" with "rain", which means "rain gives birth to a hundred valleys".

In Grain Rain season, in the south of our country, it often begins to appear obvious rainy weather, especially in the south of our country. Once cold air meets warm and humid air, it often forms a long rainy weather. Qinhuai River is a transitional area between the spring rain area in the south and the spring drought area in the north. From the Qinling-Huaihe River to the north, the spring rain decreased sharply. In the northern region, Grain Rain is a symbol of the "final frost".

Agricultural activities in rainy season

Grain Rain and Grain Rain are connected, which means "Rain gives birth to hundreds of valleys" and embodies the agroclimatic significance of "Grain Rain". The climate in Grain Rain is mainly rainy. At this time, the rain is not only abundant, but also urgent. The so-called rain gives birth to a hundred valleys, which is a good time to sow.

Grain Rain season is also the heading and flowering period of overwintering crops, and the seedling stage of spring-sown crops such as corn and cotton needs abundant rain to promote their development and growth.