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以生产上广泛应用的杂交籼稻Y两优1号、扬两优6号和Y两优2号为试验材料,研究其播期对麦茬机插籼稻生育期、产量及其构成因素的影响。结果表明,随着播期的推迟,不同品种机插稻的拔节期、抽穗期和成熟期相对延迟,生育进程缩短,全生育期显著缩短;即播期每推迟5 d,全生育期缩短2.8 d。随着播期的推迟,产量构成因素均呈逐渐下降趋势,产量显著或极显著下降,品种间下降幅度不同;受播期影响大小依次为每穗粒数>结实率>穗数>千粒质量,其中播期与产量及其构成因素(千粒质量除外)均呈极显著相关。在播期影响下,Y两优2号产量潜力最高,扬两优6号产量潜力实现率最高;即播期每推迟5 d,3个机插籼稻品种的实产减少613.3~646.7 kg/hm~2。
The effects of sowing date on the growth period, yield and components of indica rice with indica rice at different sowing dates were studied with Y Liangyou 1, Yangliangyou 6 and Y Liangyou 2, which are widely used in production. The results showed that with the delay of sowing date, the jointing stage, heading stage and maturity stage of different rice varieties were relatively delayed, the growth process was shortened and the whole growth stage was shortened significantly; that is, the sowing stage shortened by 2.8 days d. With the delay of sowing date, the components of yield components showed a gradual downward trend, with significant or very significant decrease in yield, and the decreased amplitude among varieties. The order of effect of sowing date was grain number per spike> seed setting rate> spike number> 1000-grain weight , Of which sowing date and yield and its components (except for the quality of grain) were significantly correlated. Under the influence of sowing date, the yield potential of Y Liangyou 2 was the highest, and the yield potential of Yangliangyou 6 was the highest. When the sowing date was postponed for 5 days, the yield of three indica rice varieties decreased 613.3-646.7 kg / hm ~ 2.