超级杂交稻Ⅱ优航1号高产栽培产量结构分析

Analysis of Yield Components of High-yield Cultivation of Super Hybrid Rice Ⅱ Youhang No.1

【目的】揭示超级稻Ⅱ优航1号的高产结构特征。【方法】2005-2006年调查了75块Ⅱ优航1号不同产量水平的产量结构,进行相关分析和通径分析。【结果】结果表明,每穗粒数对产量的贡献为61.47%,每公顷穗数为25.59%,结实率为9.32%。每公顷穗数和每穗粒数对每公顷总粒数的贡献分别为35.48%和62.70%。每公顷总粒数对库容量的贡献为99.96%。库容量对稻谷产量的贡献89.05%,结实率的贡献为10.23%。【结论】说明Ⅱ优航1号超高产的关键是应培育足穗大穗,增加单位面积的总粒数,扩大库容量,并注重提高结实率。

[Objective] The objective of the current study was to explore the High-yield compo- nents of Super Hybrid rice Ⅱ Youhang No. 1. [Method] The correlation and path analysis were made on the high-yield components of different production levels of Super Hybrid rice Ⅱ Youhang No. 1 in 75 different fields between 2005 and 2006. [Results] The contribution of spikelet number per panicle, panicle number per hm^2 and seed setting rate to yield were 61.47%, 25.59% and 9.32 %; the contribution of panicle number per hm^2 and spikelet number per panicle to total spike- let number per hm^2 are 35.48% and 62.70%. The contribution of panicle number per hm^2 to the sink volume was 99.96%. The contribution of the sink volume and seed setting to yield were 89.05% and 10.23%. [Conclusion] The keys to obtain the high-yield of Super Hybrid rice ⅡYouhang No. 1 are to breed sufficient panicle numbers and larger panicles, increase the total grain numbers per unit area, enlarge sink volume for obtaining super high yield and focus on raising the percentage of seeds setting.