What are the climatic characteristics of Xiaoman? What is the impact on agriculture?

Xiaoman is called Xiaoman when the sun reaches 60 degrees along the ecliptic on May 2 1 or 22 every year. "Xiaoman" means that the seeds of summer crops such as wheat in the Yellow River valley are full, but not yet mature, so it is called Xiaoman. The summer crops in the north and south of the river have matured one after another and started to grab the harvest of sunshine. At this time, the average daily temperature in the middle and lower reaches of the Yangtze River ranges from 20 degrees to 23 degrees, and the rainfall ranges from 50 mm to 70 mm. Compared with previous solar terms, the rainfall is slightly less, but South China has gradually entered the rainy season. In the northern region, it is necessary to strengthen the management of winter wheat at the late stage of grain filling or maturity to prevent the adverse effects of "dry hot wind" weather on yield; At the same time, intertillage, weeding and ridging of corn, sorghum and other seedlings in the field are also particularly important. As the saying goes, "innocent girl is full of goose feathers in summer", which is aimed at the Northeast.