Cultivar selection and seeding rate influence soft red winter wheat (Triticum aestivum L) grain yield. Re‐evaluating optimum seeding rate for crops is necessary as modern cultivars may show a greater yield advantage when planted at a higher plant population compared with older cultivars. Furthermore, the relationship between wheat stem population density and yield needs to be understood to help producers make informed estimates of yield potential. The objectives of this research were to determine: (a) the agronomic and economic optimum seeding rate (AOSR and EOSR, respectively) of soft red winter wheat, and (b) the relationship of wheat stem population density and grain yield. Trials were established during two growing seasons at two locations in Ohio with four wheat cultivars and four seeding rates ranging from 1.85 to 6.18 million seeds ha⁻¹. Among the four cultivars, the quadratic plateau model resulted in an average AOSR of 4.20 million seeds ha⁻¹ and an average EOSR of 3.13 million seeds ha⁻¹. The AOSR was 10–33% greater than the previous recommendation of 2.96 to 3.95 million seeds ha⁻¹. This increase may be due to modern wheat cultivars having a higher tolerance to increased plant density as the previous recommendation, which is over 30‐yr old. Wheat stem number was linearly related to grain yield and explained 31% of the variability in yield. Planting the optimum number of wheat seeds followed by wheat stand evaluation in the spring should result in maximum economic return and informed decisions regarding wheat yield potential.

中文翻译：

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软红冬小麦的最佳播种量和林分评估

品种的选择和播种量影响软红冬小麦（Triticum aestivum）L）谷物产量。重新评估作物的最佳播种率是必要的，因为与较高品种相比，当现代品种以较高的植物种群种植时，其显示出更大的产量优势。此外，需要了解小麦茎密度与单产之间的关系，以帮助生产者对单产潜力进行明智的估计。本研究的目的是确定：（a）软红冬小麦的农艺和经济最佳播种率（分别为AOSR和EOSR），以及（b）小麦茎秆密度与籽粒产量的关系。在俄亥俄州的两个地点的两个生长季节建立了试验，试验了四个小麦品种，四个播种量为1.85至618万公顷ha ^-1。在四个品种中，二次高原模型的平均AOSR为420万种子ha ^-1，平均EOSR为313万种子ha ^-1。AOSR比先前建议的2.96至395万种子ha ^-1高出10-33％。这种增加可能是由于现代小麦品种对植物密度的耐受性更高，正如先前的建议（已有30多年的历史）。小麦茎数与籽粒产量成线性关系，解释了31％的产量变异性。播种最佳数量的小麦种子，然后在春季进行小麦林分评估，应能获得最大的经济回报，并就小麦单产潜力做出明智的决定。