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西部半干旱地区年降雨量430mm左右,大多集中在7～8月,份形成夏涝春旱特点,春旱频率高达70％以上。因此春播一直是依靠土壤对夏季降雨的调节作用所形成春季返浆返润水进行的。从而也形成一整套利用返浆返润水抗旱保墒的农耕技术体系,如顶浆搅、挤
In the western semi-arid area, the annual rainfall is about 430mm, mostly concentrated in July-August, forming a characteristic of floods and floods in spring and drought. The frequency of spring drought is over 70%. Therefore, spring sowing has been relying on soil to regulate the summer rainfall formed by the spring back to rehydration. Thus forming a complete set of farming technology system that utilizes backsetting water, drought-resistant and moisture-preserving technologies, such as jacking, squeezing