【摘要】 选用黑龙江省目前典型高产粳稻品种和新育成的超高产有望品系 ,在哈尔滨的高产栽培条件下进行了田间试验 ,比较了供试品种结实率差异 ,分析了结实率和抽穗期关系。结果表明结实率品种间差异极显著。各品种穗上部结实率 >中部 >下部。但结实率具有整穗性 ,在较高结实率范围内穗中、下部位子粒结实好坏影响了整穗结实率高低。结实率是黑龙江省目前水稻实现超高产首要限制因素 ,适当提早品种抽穗期有利于提高结实率。讨论后提出黑龙江省水稻超高产育种应重视对大粒特性的利用。更多还原

【Abstract】 The field experiments using 12 currently typical high yielding varieties or possibly super high yielding strains developed recently from the Heilongjiang Province were conducted under the high yielding cultvation in Harbin. The varietal difference in the percentage of ripened grains of tested varieties was compared, and the relationship betweet percentage of ripened grains and the heading date was analysed. The results indicated that there was significant difference in the percentage of ripened grains of the tested varieties. The percentage of ripened grains on the upper panicle was higher than that on the middle which was higher than that on the lower part. The percentage of ripened grains of the whole panicle was affected by the ones on the middle and lower parts in the high range of the percentage of the ripened grains, and the variety with high percentage of ripened grains based on each part of panicle. The percentage of ripened grains was currenthy the first limitation to the rice super high yield in Heilongjiang Province. Earlier heading date was helpful to high percentage of ripened grains. Based on the discussion, it was put forward that we should pay more attention to the grain weight in the case of super high yielding breeding in Heilongjiang Province.更多还原