为了提高松花江7号的丰产性和早熟性,同时保持其质佳、抗逆性强等特点,用~(60)Co-γ射线处理了风干原种。照射剂量为2.0万伦琴和2.2万伦琴,M_1代存活率分别为63.5％和20.29％。M_2代人选率为0.2％。M_3代决选出一个多花、早熟、白粒的顶芒突变系龙福76-3061。经过两年的产量鉴定试验,该突变系表现整齐一致、早熟高产、秆强抗倒有弹性,抗病、落黄好、品质优良。小区产量为536.7—669.6斤/亩,比对照增产12.4—17.6％,达到预期的育种目标。 In order to improve the high yield and precocity of the Songhua River No.7, while maintaining its good quality and strong resistance, the dried roots were treated with ~ (60) Co-γ rays. Radiation doses of 20000 roentgen and 2.2000 roentgen, M_1 generation survival rates were 63.5% and 20.29%. M_2 generation rate of 0.2%. M_3 generation decided to select a flowering, precocious, white topped mutant Department Long Fu 76-3061. After two years of yield test, the mutant line showed consistent, early maturity and high yield, strong stalk resistance, disease resistance, good yellow, good quality. Community yield 536.7-669.6 kg / mu, 12.4-17.6% increase compared with the control, to achieve the desired goal of breeding.