What is rain?

As the name implies, the solar terms of rain indicate that large-scale snowfall has stopped and started to enter the rainy season (but sometimes light snow is not excluded). The warm and humid air stream began to land in the southeast of China, and the rain gradually increased. Nature is gradually sketching out a picture of "ten-mile warblers singing green and reflecting red, and spring rain moistening things silently". The rain is usually around February 18 every year, when the sun reaches 330 degrees. The names of solar terms basically have two meanings: ① As the weather gets warmer, the rainfall gradually increases. (2) It shows that the snowfall decreases, mostly due to rainfall. "Twenty-four solar terms": "Spring begins with wood, but there must be water for those who grow wood, so there must be rain in beginning of spring. If the east wind melts, it will disperse into rain. "

Because precipitation has a particularly important impact on the growth of crops in this period, there is a proverb that "spring rain is as expensive as oil". During this period, the precipitation in North China, Northwest China and Huanghuai areas is less, which often fails to meet the needs of agricultural production. In the case of little rain in early spring, the economic benefits of crops can be greatly improved if water is replenished in time before and after the rain solar term. At this stage, the area south of Huaihe River should strengthen ploughing and hoeing, improve field waterways and prevent excessive spring rain. "Water the buds with wheat, water the flowers with vegetables", and topdressing the coated rape with moss fertilizer in time to increase pods and weight. In South China, this period is the time to raise seedlings of double-season early rice, so it is necessary to sow in sunny days.

In ancient times, rain was also divided into three stages: "One stage was that Rex sacrificed fish; Second, wait for Hongyan to come; Third, wait for the grass to sprout. " This kind of solar otter starts fishing, and putting the fish on the shore is like being sacrificed first and then being eaten; Five days later, the geese flew back to the north from the south; In five days, the vegetation will rise in the spirit of the sun in the spring rain and begin to sprout. This land has gradually formed a thriving scene.

Before and after this solar term, the weather changes abnormally, and the cold waves all year round seem to appear at this time. The change of hot and cold and the weather that turns warm and cold at first do great harm to crop greening and people's health. At this time, we should pay special attention to the cold and antifreeze work of crops, especially greenhouse vegetables.