The transfer of "rain" solar terms is entering the fifth day of the "July 9". One of the characterizations is the melting of the ice, which means climate changes such as rising temperatures, increasing precipitation, and increasing humidity. The second change, with the temperature rising, led to the opening of the river. In the same way, frozen soils in the northern regions have to start thawing. As the ground gas rises, soil refreezing will occur in the freezing layer. After entering the rainwater, the 20 cm thick soil on the surface of the Yellow River valley can be defrosted, which is beneficial to the development of crop roots, and promotes the absorption of water and nutrients, so that the winter wheat will enter the greening or jointing stage. Since rain and air temperature are the two basic elements of agricultural production, rainwater saving is critical for the growth of winter wheat and other overwintering crops. However, the rain in the northern region is less rainy and rainy, and over the years, the spring rain is more expensive than oil. In order to strive for a good summer harvest, we must adjust measures to local conditions, emphasize scientific drought resistance, and conduct differential management: 1. In the arid winter wheat area. When the rainwater-saving solar wheat seedlings have reached the stage of returning green, they do not need water supply, and when the dry soil layer of the wheat field reaches 5-8 cm or more, it must be artificially irrigated and timely poured back to Qingshui. (1) Where sprinkler irrigation is performed, a small amount of potassium dihydrogen phosphate and urea are sprayed together with sprinkler irrigation; (2) Under conditions of ground irrigation, if the amount of water is sufficient, the amount of returning green manure may be appropriately applied; (3) In areas with artificial rainfall, due to the small amount of rainfall, no large amount of nitrogen fertilizer can be applied to the surface, which would only cause nitrogen to be wasted. Because this time the watering is to save water, the yellow seedlings are not lacking but are caused by drought. The supplemental nitrogen fertilizer can be postponed and delayed after the wheat seedlings are restored. 2. In wheat fields where the drought is not severe, and wheat fields without irrigation conditions. Pay attention to buckwheat. From a scientific point of view, the soil itself is a “reservoir†(a large number of tests show that when the soil is homogeneous loamy soil, 2 meters deep soil can save 360 ​​to 400 cubic meters of water per mu per year), It is the practice of water-saving agriculture to make full use of deep soil reservoirs to supply water to winter wheat. If we can scientifically use and fully mobilize the resources of the soil reservoir, we can alleviate the hunger for water in arid wheat seedlings, and we can also adjust the inconsistency between the crop water requirement period and the precipitation period. As we all know, many northern regions had sufficient autumn rain last year. These rainwaters existed in the deep layers of the soil. As the Nongken said, “using spring rain and using spring rain†and “resisting during the spring drought and falling autumn†refer to how agricultural measures such as the suppression of drought and repression occurred during the spring drought. To achieve the purpose of security, so as to ease the drought. As many years of experience of the peasants have described, "rain is rainier and more rainy than oil, and the top is turbulent against turbulence." For example, peasants in northern Shanxi and Inner Mongolia think that the “three-nine lands†can be preserved, and farmers in Qinghai believe that it can be lifted before thawing. Hebei’s peasants believe that the top soil after the spring can use the soil to return to the frozen layer. Paddle water is a valuable experience in saving water and drought.
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Key points for managing winter wheat in rainy season
"Rainwater" is the second solar term after the beginning of spring. At 20:26 on February 18, it was the handover time for this year's “rainwater†solar terms. It shows that the snow season has passed and the season of rainfall and rain increases.