【摘要】 选用黑龙江省目前生产上典型高产水稻品种或新近育成的超高产品系 11个 ,在超高产栽培条件下研究寒地水稻品种成熟期叶面积变化过程的差异及其对结实率影响。结果表明 ,寒地水稻成熟期叶面积变化过程可分为叶面积阶段 和 ,叶面积阶段 的叶面积稳定不变 ,阶段 叶面积直线下降。不同寒地水稻品种抽穗期叶面积、叶面积阶段 的持续时间、叶面积阶段 的叶面积降低速率等特征不同。抽穗期叶面积小、叶面积阶段 持续时间长和叶面积阶段 的叶面积降低速率低 ,有利于提高结实率更多还原

【Abstract】 Varietal difference in change process of leaf area per plant during ripening period and their effects to percentage of ripened grains were studied using 11 rice varieties that were currently extended or recently developed in Heilongjiang Province.The results indicated that the change process of leaf area induded 2 phases.The leaf area remained stable in phase 1 and decreased in phase 2.There were significantly differences in the duration of phase 1,leaf area at heading stage and leaf area decrease rate during phase 2.The smaller leaf area at heading stage,longer duration of phase 1 and lower leaf area decrease rate during phase 2 were,the higher the percentage of ripened grains was.$$$$更多还原