[目的]为提高单季晚粳稻机插秧的生产水平.[方法]以中熟晚粳秀水134为试材,采用二次回归饱和D-最优设计方法,研究机插秧的株距(X1)、丛苗数(X2)对产量及主要性状的作用效应.[结果]株距因子显著影响分蘖、有效稳、每穗总粒数、结实率和产量；丛苗数因子主要对最高苗、有效穗、株高、每穗总粒、结实率、千粒重和产量的效应显著.因子间的互作对分蘖、有效穗、成穗率、每穗总粒数影响显著.[结论]模拟筛选单产≥10 200 kg/hm2的优化措施为:株距12.9～15.9 cm,丛苗数2.4～3.6本/丛.%[Objective]The purpose was to study the applicability and yielding ability of middle-season rice varieties in the Region along Huai River, and screen suitable middle-season rice varieties for local planting.[Method]Twenty varieties were Fengliangyouxiang No. 1 , Jinyou 527, Huailiangyou 527, Dyou 202, Fengliangyou No. 1, Dyou 527, II you 7954, Yliangyou No. 1, Qyou No. 6, Iiangyoupeijiu, Yanglian gyou No. 6, Fengliangyou No. 6, Huiliangyou No. 6, II you 602, Xinliangyou No. 6, Neiliangyou No. 6, II youhang No. 1 , Luoyou No. 8 and Liangyou 1128. All varieties were arranged randomly with two repeated, planting specifications was 30. 0 cm x 14. 7 cm.[Result]The results show that the synthetical properties of Huiliangyou No. 6, Dyou5 27 and II you 7954 were relatively comprehensive, suitable for plant ing in the Region along Huai River.[Conclusion]The study provides a scientific guidance for rice variety choice in the Region along Huai River.
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