Seeding at the optimum rate is among many decisions considered crucial for crop production. The main objective of this research was to evaluate seeding rate responses for popular dryland winter wheat (Triticum aestivum L.) varieties and determine if variety specific seeding rates were warranted. The study was conducted from 2015 through 2018 at Colby, Garden City, and Tribune, KS. The response of four winter wheat varieties Byrd, T158, TAM 111 or TAM 114, and Winterhawk at five seeding rates (34, 50, 67, 84, and 101 kg ha⁻¹) were studied. The main effects of seeding rate and variety affected grain yield in all 12 environments with only one exception. The lowest yielding seeding rate was 34 kg ha⁻¹ with seeding rates of 84 and 101 kg ha⁻¹ producing the greatest yields in all years and locations. Averaged across site-years, there was a 17% yield advantage from selecting seeding rates 67 kg ha⁻¹ and greater compared with the lowest seeding rate (34 kg ha⁻¹). A combination of two or more yield components was a good predictor for wheat yield response to increased seeding rate. Lower than optimum seeding rates reduced grain yield while no agronomic penalty was observed to seeding rates above the optimum. We concluded a seeding rate of 67 kg ha⁻¹ or more and variety selection are important factors for dryland winter wheat yield in the central Great Plains region. Results of this study do not support the necessity of variety specific seeding rate for dryland wheat production in the central Great Plains.

中文翻译：

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旱地冬小麦基因型的产量构成及其对播种量的响应。

在许多决定中，以最佳比例播种对作物生产至关重要。这项研究的主要目的是评估流行的旱地冬小麦（Triticum aestivum L.）品种的播种量响应，并确定是否需要特定品种的播种量。该研究于2015年至2018年在科尔比，花园城和堪萨斯州Tribune进行。研究了四种冬小麦品种Byrd，T158，TAM 111或TAM 114和Winterhawk在五种播种量（34、50、67、84和101 kg ha ^-1）下的响应。播种率和品种的主要影响在所有12个环境中影响了谷物产量，只有一个例外。最低的播种量为34 kg ha ^-1，播种量分别为84和101 kg ha ^-1在所有年份和所有地点产生最大的产量。从整个播种年平均来看，选择播种量67 kg ha ^-1可获得17％的产量优势，而最低播种量（34 kg ha ^-1）则更高。两种或多种单产的组合是小麦单产提高对播种量反应的良好预测指标。低于最佳播种量会降低谷物产量，而未观察到高于最佳播种量的农艺损失。我们得出的播种量为67 kg ha ^-1一个以上或更多品种以及选择品种是中部大平原地区旱地冬小麦单产的重要因素。这项研究的结果不支持大平原中部旱地小麦生产的特定品种播种率的必要性。