寒丰不育系属BT型晚粳稻不育系。该研究始于1981年春,以BT型农进2号不育系为母本,以上海地区推广的矮杆、优质、高产的中熟晚粳寒丰为父本,采用回交转育法,经多次连续回交,于1985年育成了BT型寒丰不育系。该系至今已回交16代,不育性稳定,经济性状一致。经多次套袋鉴定,不育株率和不育度均达不育系标准。该系感光性较强,抽穗期相对稳定。播种至始穗历时92—95天。全生育期约140天。株高90cm左右(用作双季稻时80cm)。花时集中,异交结实率高。制繁种产量150—200kg/亩 Han Feng sterile BT type late japonica rice CMS line. This study was started in the spring of 1981 with the BT-type CMS-2 sterile line as female parent and the low-barreled, high-quality and high-yielding middle-maturing late rice Hanfeng popularized in Shanghai as the male parent. After many consecutive backcross, bred in 1985, BT-type cold Feng sterile line. The department has been back to the 16 generations, infertility and stability, the same economic traits. After many bagging identification, the rate of sterile plants and sterile have reached the standard of sterile line. The Department of photosensitive strong, relatively stable heading. Sowing to the beginning of the ear duration of 92-95 days. The whole growth period of about 140 days. Plant height of about 90cm (when used as double cropping rice 80cm). Focus on time spent, outcrossing high rate of fruiting. System of production of 150-200kg / mu