汾阳、文水、平遥三县是晋中主要棉区,位于汾河与文峪河之间。这里的无霜期祇有150-160天,所以棉花需要发育快、成熟早,但由于这里实行的是一水浇地制度、兼以常常春早多风,保苗不易,再加蚜虫为害,后期多雨,以致常使成熟期延迟,霜前花产量减少,纤维品质降低。这种情况是亟待改进的.一水浇地的办法是在秋收以后至春耕以前,大水 Fenyang, Wenshui, Pingyao three counties are the main cotton area in Jinzhong, located between the Fen River and Wenyu River. Here frost-free period is only 150-160 days, so the cotton needs rapid development, early maturity, but because here is a system of irrigated land, and often windy early spring, seedling is not easy, plus aphids damage, late rainy, so Often delay the maturation period, reduced frost flower yield and reduced fiber quality. This situation is in urgent need of improvement .A solution to the irrigated land is that after the autumn harvest to the spring before, the flood