棉花良种现己甚本普及全省,因此,几年来对棉花产量的提高和品质的改进起了很大作用。但也有不少地区由于种棉年代较长,棉籽都有不同程度的退化现象。据一九五九年在晋中汾阳等县调查,涡及棉田间杂株率达8%左右;晋南的运城、平陆、芮城、闻喜、稷山等县,岱字棉15号田间杂株率 Cotton varieties are now very popular throughout the province, so the past few years on the improvement of cotton production and quality played a significant role. However, in many areas, due to the longer cotton planting period, cottonseeds have various degrees of degeneration. According to a survey conducted in 1959 in Fenyang and Jinzhong Counties, the rate of heterosis in the vortex and cotton fields was about 8%; in Yuncheng, Pinglu, Ruicheng, Wenxi and Jishan counties in the south of Shanxi Province, Dai Zi Cotton No.15 Field rate of other plants