为选育适宜中海拔地区生产的水稻新品种,本试验以有效穗14万/667m2、结实率80％、千粒重27 g、穗平实粒数160粒作为统计的分界点,对223个参试组合的有效穗、穗平实粒数、结实率和千粒重进行统计与分析.结果表明:一个性状达到分界值以上的组合中,增产组合所占比例均在65％以下；两个性状达到分界值以上,则增产的几率都达到72.7％以上,其影响力为:结实事＞有效穗＞实粒数＞千粒重.只有满足有效穗14万穗/667m2、结实事80％、千粒重27g、穗平实粒数160粒中的多个性状指标,才会具有较大的增产潜力.%To find out a new idea for rice varieties breeding which was suitable for middle elevation aiea, taking the effective panicles of 14 x 104 panicles / 667 m2 , the filled grain number of 160 grains/ panicle, seed setting rate of 80 % and 1000-grain weight of 27 g as the division point,respectively. 223 hybrid combinations were counted and analyzed . The results showed that there was only one economic trait was up the division point, the ratio of combinations, whose yield increased, was under 65 percent; if there were two, the ratio was up 72. 7 percent and the order of influence was: seed setting rate > the effective panicle > the filled grain number per panicle > 1000-grain weight. It was concluded that only if there were several index up the division point, which included the effective panicles of 14 x 104 panicles / 667 m2, the filled grain number of 160 grains/ panicle, seed setting rate of 80 % and 1000-grain weight of 27 g, the rice combinations would have the yield potential.
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