杂交早稻结实率不稳定,空壳率一般比常规品种高。我们1979-1981年小区优势鉴定的264个杂交组合中,有185个空壳率在31—50%之间,有28个空壳率在50%以上,仅51个空壳率为20—30%,而对照常规品种湘矮早9号的空壳率3年平均为15.96%。尽管这些组合每穗总粒数较多,有的甚至超过对照种 Early hybrid rice seed setting rate instability, the shell rate is generally higher than the conventional varieties. Of the 264 hybrid combinations we identified for community advantage in 1979-1981, 185 had a shell-to-shell ratio of 31-50%, 28 had a shell-to-shell ratio above 50% and only 51 had a shell-to-shell ratio of 20-30 %, While that of the control conventional variety Xiang-dian-zao 9 was 15.96% on average for three years. Although these combinations have more total grains per panicle, some even exceed the control