野败籼型杂交晚稻稳产性和广适性的演变

用回归系数(b)和广适应性参数估算了3个杂晚组合历年在不同区域范围的稳产性和广适性,探讨它们的演变结果:(1)杂晚组合稳产性和广适性演变过程估值大致为:b1或b值年间波动大,稳产性差。适应性参数和b变化相似。(2)优良杂晚组合从进入区试到示范推广至更换,稳产性和广适性估值可连续达6～8年,但组合间有差异。(3)稳产性好和广适性强的杂晚组合共同特点,生育期、千粒重、穗长、株高的变异幅度和C.V.％平均值小,结实率变异中等。

Study on the Gradual Variation of Yield Stability and Wide Adaptability of the Wild Abortion Hybrid Rice

The yield stability and wide adaptability of three cultivars of the wild abortion hybrid late rice were evaluated with the regressive coefficient (b) and adaptability parameter. The results showed 1. the gradual variation roughly was from good yield stability (b<1 or b= 1) to bad one (b> 1 or b varying with years); 2. the period of yield stability and wide adaptability of a good hybrid rice cultivar might reach 6-8 years from its entrance of the regional test to its popularizarton and to its being substituted, but feeble variation existed in various hybrid cultivars; 3. the common characters of the hybrid rice cultivars with good yield stability and wide adaptability were small variation ranges and small mean coefficients of variation of growth period, weight per 1 000 grain panicle length and plant height.