二、群体改良工作初步结果(一)在二南24群、525群 C_0的基础上,经过南繁北育加代,1985年已获得二群体的半姊妹轮回选择、半姊妹相互轮回选择的 C_0、C_1和经过三次混合选择的 M_1、M_2、M_3等各类种子。并已将各类选择方法所获得的种子进行直接比较和测交种比较,以说明各种 Second, the preliminary results of the group improvement work (a) On the basis of 24 groups of south and 525 groups of C_0, after Southern Fan north plus plus generation, 1985 has obtained two groups of half sister reincarnation selection, half sister recurrent selection C_0, C_1 and M_1, M_2, M_3 and other seeds that have been mixed for three times. The direct comparison and comparison of seeds obtained from various selection methods have been conducted to demonstrate that various