Abstract Soybean (Glycine max (L.) Merr.) response to phosphorus (P) fertilization can vary by fertilization strategy, tillage system, and soybean variety. The objectives of this study were to access possible differences in soybean productivity and P fertilizer efficiency as affected by contrasting soybean varieties and P fertilizer placement. The effects of two soybean varieties and six P fertilizer placements on soybean shoot dry weight, P uptake, apparent P recovery, seed P concentration, seed yield, P removal, and partial P balance were investigated in four sites in Kansas, during the 2014 and 2015 growing seasons. Band fertilizer applications increased the apparent P recovery at the soybean V3 growth stage and increased the shoot dry weight up to 9.13 and 12.9% compared to broadcast and control, respectively. Likewise, the band fertilizer treatments increased the P uptake by 30% compared to the control plots. On the other hand, the P concentration in soybean tissue at the R3 growth stage was higher under broadcast treatments. Yield differences were observed between variety selection only and varied by site. The good soil drainage variety increased the P removal by the seed on 5 and 6.9% at Ottawa 2015 and Scandia 2014, respectively, compared to the poor soil drainage variety. In general, band-applied treatments resulted in P fertilizer optimization during early soybean growth whereas broadcast treatments optimized fertilization efficiency during the soybean reproductive stage. The lack of soybean yield response to P fertilization suggests that P was not the limiting factor for yield response in this study.

中文翻译：

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磷肥优化受大豆品种和投放策略影响

摘要 大豆 (Glycine max (L.) Merr.) 对磷 (P) 施肥的响应会因施肥策略、耕作系统和大豆品种而异。本研究的目的是了解大豆产量和磷肥效率可能受到不同大豆品种和磷肥施用量的影响。2014 年和 2014 年，在堪萨斯州的四个地点调查了两种大豆品种和六种磷肥对大豆芽干重、磷吸收、表观磷回收、种子磷浓度、种子产量、磷去除和部分磷平衡的影响。 2015年生长季节。与广播和对照相比，条带施肥增加了大豆 V3 生长阶段的表观磷回收率，并使地上部干重分别增加了 9.13% 和 12.9%。同样地，与对照地块相比，条带施肥处理使磷吸收量增加了 30%。另一方面，在 R3 生长阶段的大豆组织中的 P 浓度在广播处理下较高。仅在品种选择和不同地点之间观察到产量差异。与土壤排水不良的品种相比，良好的土壤排水品种在 2015 年渥太华和 2014 年的斯堪迪亚分别增加了 5% 和 6.9% 的种子对磷的去除。一般来说，条带施肥在大豆早期生长期间优化了磷肥，而在大豆生殖阶段，广播处理优化了施肥效率。大豆产量对磷肥缺乏响应表明磷不是本研究中产量响应的限制因素。