有些社、队种植棉花只重视引种、调种,而忽视了选留种工作,致使棉花品种出现多、乱、杂现象,不仅造成减产,而且病害逐年加剧。目前我省棉花品种已达50多个,田间纯度一般只50—70%,有的仅30%左右,产量低,品质差。据调查,衣分下降2—5%,绒长下降2—3毫米。枯、黄萎病迅速蔓延。五十年代全省仅有两个县七、八个大队零星发生,现在已达73个县100多万亩棉田,每年还以15%的递增速度扩散。因此,抓住时机,广泛开展棉花棵选、混收 Some clubs and teams planted cotton only to emphasize the introduction and transfer of seeds while neglecting the selection of retained seeds. As a result, more and more chaos and miscellaneous phenomena appeared in cotton varieties, which not only led to the reduction of production but also intensified the diseases year by year. At present, our province has reached more than 50 varieties of cotton, field purity is generally only 50-70%, and some only about 30%, low yield, poor quality. According to the survey, clothing points down 2-5%, plush length down 2-3 mm. Withered, Verticillium wilt spread rapidly. In the 1950s, there were only seven or eight brigades in two counties in the province that sporadically took place. Now they have reached over 1 million mu of cotton fields in 73 counties and are still proliferating at an annual rate of 15%. Therefore, seize the opportunity to carry out a broad selection of cotton trees, mixed harvest