Abstract Seed yield is commonly expressed as the product of shoot biomass and harvest index (HI) at physiological maturity. However, HI is a size-dependent ratio unsuitable to describe shifts in reproductive partitioning in historical soybean [Glycine max (L.) Merr.] studies where selection has enhanced shoot biomass. The aim of this work was to analyze allocation of biomass to reproductive organs in the onset of seed filling (R5) using allometric analysis in a set of historical soybean varieties. Seven varieties released between 1980 and 2013 were evaluated in field trials in Rossville (Kansas, United States) under two N fertilizer rates (0 and 670 kg N ha−1) in 2016 and 2017. Seed yield increased at a rate of 0.74 % yr−1 (p

中文翻译：

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异速生长分析揭示了历史大豆品种的繁殖分配增强

摘要 种子产量通常表示为生理成熟时地上部生物量和收获指数（HI）的乘积。然而，HI 是一个大小依赖的比率，不适用于描述历史大豆 [Glycine max (L.) Merr.] 研究中生殖分区的变化，其中选择提高了芽生物量。这项工作的目的是在一组历史大豆品种中使用异速生长分析来分析在种子灌浆 (R5) 开始时生物量对生殖器官的分配。2016 年和 2017 年，在罗斯维尔（美国堪萨斯州）的田间试验中，对 1980 年至 2013 年发布的七个品种在两种施氮量（0 和 670 kg N ha-1）下进行了评估。种子产量以每年 0.74 % 的速度增长−1 (p