Twelve rapeseed varieties introduced from several institutes were used for comparison test in order to understand the related traits of early - maturing Brassica napus L and screen early - maturing double - low rapeseed varieties suitable for double cropping rice areas of Hunan. The results showed that growth duration of Qingza 3 and Qingza 7 was shortest, 195 days, which was earl.ier 4 days than CK, while their yield was lower because of many reasons. Yield of G - 11 was highest, 3 122. 55kg/hm2, which was increased by 18. 76% than CK, and it＇...
