棉花良种繁殖工作是育种工作的继续。良种繁殖系数越高,推广速度越快。这不仅可以减少棉花良种在推广中混杂退化,延长在生产上的利用年限,而且可以利用良种低世代的优势,使其优良经济性状充分发挥出来,达到高产优质,增加经济效益的目的。针对棉花繁殖系数远低于一般禾本科作物, The breeding of cotton varieties is the continuation of breeding work. The higher the breeding coefficient, the faster the promotion. This not only can reduce the mixed degeneration of the improved varieties in the promotion, prolong the useful life in the production, but also make full use of the superiority of the lower generation of the elite so as to give full play to their excellent economic traits and achieve the goal of high yield, high quality and economic benefits. Breeding coefficient for cotton far below the average gramineous crops,