What are the climate changes in Xiaoman?

The solar term is one of the twenty-four solar terms and the second solar term in summer. It means that the seeds of summer crops are full, but immature, just small and not full. On May 2 1 or 22 every year, when the sun reaches 60 yellow diameter, it is regarded as a small full.

Twenty-four solar terms: "In mid-April, things are small and full." At this time, the seeds of summer sowing crops such as wheat in the north have begun to be full, but they are not yet mature, which is about the late stage of milk ripening, so it is called Xiaoman. Agricultural proverbs in southern China give Xiaoman a new meaning: "Xiaoman is not satisfied, he thinks about it"; "Little people are full of discontent, regardless of mangoes." The word "full" is used to describe the amount of rain, and it is pointed out that if there is not enough water in the field when it is full, the ridge may crack and even rice cannot be planted when it is planted.

After Xiaoman, high temperature weather above 35℃ began to appear from the south of the Yellow River to the middle and lower reaches of the Yangtze River, and relevant departments and units paid attention to heatstroke prevention and cooling. Judging from the climate characteristics, most parts of China have entered summer in Xiaoman season, the temperature difference between the north and the south has further narrowed, the precipitation has further increased, the plants in nature are full and lush, and the wheat grains are gradually full.

Summer harvest crops are close to maturity, and spring sowing crops are growing vigorously, which has entered a busy period of summer harvest, summer sowing and Shimonoseki. During this period, China's wheat areas should attach great importance to the prevention and control of wheat diseases and insect pests. As far as North China is concerned, there is a saying that "when wheat is full, it is risky", which means that in North China, winter wheat enters the mature stage when it is full, and it is most afraid of dry and hot winds at this time. At this time, North China has not yet entered the rainy season and is in a state of drought. Due to the strong solar radiation, the ground temperature rises rapidly. When dry and hot weather forms, the temperature is as high as 30℃, the minimum relative humidity is less than or equal to 30%, the wind speed is more than 3-4 meters per second, and the blowing wind is dry and hot.