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“Rainwater†is the second solar term after “Lichunâ€. At 20:26 on February 18, this is the handover time of this year's "rainwater" solar terms. The main feature of entering the rainwater is that as the temperature continues to rise, the snow melts. It shows that the snowing season has passed, and the season of rain and rain increases.
How do you understand the meaning of the “rainwater†solar terms in different regions? According to many years of historical records, the initial rain period in Xi'an, Shaanxi Province is synchronized with the rainwater phase; while the initial rainy season in Kaifeng, Henan is around the Spring Festival; the first rainy date in Beijing is in mid-March before the spring after the rain; The initial rain period in Lanzhou, Gansu Province is about the beginning of March. The rainy days in the Yangtze River Basin and the south of Wuhan, Guangzhou, Chengdu and other places are not obvious, and there may be rainfall throughout the year. The meaning of "rainwater" is not only the beginning of rainfall, but also the increase in rainfall. In the middle and lower reaches of the Yellow River, the rainfall of “Lichun†is as low as 2 mm, and the rainfall can be increased after entering the rainwater saving.
Since rainwater and temperature are the two basic elements of agricultural production, rainwater solar terms are the key to the growth of winter wheat and other winter crops. However, the rainy weather in the northern region is less rainy, and the characteristics of spring rain are as expensive as oil. In order to strive for a good harvest of summer food, it is necessary to carry out scientific management according to local conditions.
In the vast winter wheat area, when the wheat seedlings have reached the stage of rejuvenation, water supply is needed, and when the dry soil layer of the wheat field reaches 5-8 cm or more, artificial irrigation is necessary. For different irrigation methods, in the place where sprinkler irrigation equipment is used, a small amount of potassium dihydrogen phosphate and urea may be sprayed in combination with sprinkler irrigation; and under various conditions of ground irrigation, if sufficient water is available, nitrogen fertilizer may be applied in an appropriate amount. As for the areas where artificial rainfall is carried out alone, due to the small amount of rainfall, it is impossible to apply a large amount of nitrogen fertilizer on the surface. In view of the fact that the seedlings are fastened, the results may not be as expected, because at this time, the yellowing of the wheat seedlings is not a lack of nutrition, but a drought. As a result, excessive nitrogen application in the topsoil will only cause waste of nitrogen volatilization. At this time, the main purpose of watering is to save the life water. Only when the water penetrates into the soil and the root system is well developed, it can return to green and tiller. The supplement of nitrogen fertilizer should wait for the development of wheat seedlings to be postponed. In the wheat fields without irrigation conditions, it is necessary to pay attention to the protection of the peasants. The years of experience of the peasants is that "the rain is springy and expensive like oil, and the top is smashing against turbulence." From a scientific point of view, the soil itself is a “reservoirâ€. In the development of water-saving agriculture, it is very meaningful and very important to make full use of the deep soil water for the water supply of winter wheat. A large number of tests have shown that when the soil is uniform loamy soil, the 2 m deep soil can save more than 360 cubic meters per mu of water. As long as the scientific use and full mobilization of soil “reservoir†resources can alleviate the craving for drought of wheat seedlings, it can also adjust the contradiction between the crop water demand period and the precipitation period. As is known to all, many northern regions have had enough autumn rain last year. These rainwaters are stored in the deep layers of the soil. Just as the farmer said, "Fu Yuchun" and "Spring drought and autumn resistance" refer to agricultural measures such as how to suppress and suppress during the spring drought. To achieve the purpose of ensuring the flood, thereby alleviating the drought. For example, farmers in Jinbei and Inner Mongolia believe that “three or nine land†can be guaranteed. The farmers in Qinghai think that they can be raised once before they are thawed. The farmers in Hebei think that the top ridges after the spring can use the returning water from the soil frozen layer. These are valuable water-saving and drought-resistant experiences.
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