Soybean injury following an application of metribuzin soon after planting can occur under cool, wet conditions, especially for varieties that lack a high level of tolerance to the herbicide. Field experiments were conducted in 2017 and 2018 in Fayetteville, AR, to evaluate the impacts of metribuzin at 0, 280, 560, 840, and 1,120 g ai ha⁻¹ on soybean growth and incidence of soil‐borne fungi. Three classes of metribuzin tolerance (sensitive, moderately tolerant, and tolerant) were evaluated based on a previous screen. In both years, visible injury to soybean was impacted by varietal tolerance and metribuzin rate. As metribuzin rate and soybean sensitivity increased, more injury was observed. Metribuzin applied at 280, 840, and 1,120 g ha⁻¹ in 2017 and only 1,120 g ha⁻¹ in 2018 reduced soybean plant population, averaged across varieties, by 12, 23, 23, and 11%, respectively. Averaged over site years, metribuzin at 1,120 g ha⁻¹ delayed the sensitive soybean cultivars from reaching 20, 40, 60, and 80% groundcover by 11, 12, 9, and 5 days, respectively, compared to the nontreated. Metribuzin‐moderately tolerant and metribuzin‐tolerant varieties did not suffer any delays in canopy formation. In both site years, the sensitive variety had a yield loss up to 21% following metribuzin at 1,120 g ha⁻¹ when compared to the nontreated. Metribuzin did not impact colonization of soybean in either site year by microorganisms in the genus Acrophilaphora, Collectotrichum, Didymella, Fusarium, Pythium, Macrophomina, Phomopsis, Rhizoctonia, Rhizopus, and Trichoderma. Delays in canopy formation can be mitigated through appropriate variety selection.

中文翻译：

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甲双胍对大豆生长和土壤传播真菌发生的影响

种植后不久施用美法津后，大豆的伤害可能会在凉爽，潮湿的条件下发生，特别是对于对除草剂缺乏高度耐受性的品种。分别于2017年和2018年在美国阿肯色州Fayetteville进行了田间试验，以评估美甲嗪在0、280、560、840和1,120 gai ha ^-1下对大豆生长和土壤传播真菌的影响。在先前的筛选基础上评估了三类Metribuzin耐受性（敏感，中度耐受和耐受）。在这两年中，大豆的可见损伤都受到品种耐受性和甲曲辛率的影响。随着metribuzin速率和大豆敏感性的增加，观察到了更多的伤害。美曲津在2017年的施用量为280、840和1,120 g ha ^-1，仅1,120 g ha ^-1在2018年，按品种平均计算的大豆植物种群分别减少了12％，23％，23％和11％。与未处理的相比，在位点年平均水平为1,120 g ha ^-1的美法津使敏感的大豆品种分别推迟了11、12、9和5天达到20％，40％，60％和80％的地面覆盖率。耐Metribuzin和耐Metribuzin的品种在冠层形成方面没有任何延迟。与未经处理的相比，在两个站点年中，在进行美曲嗪处理后，敏感品种在1,120 g ha ^-1下的产量损失高达21％。在任何位点，Metribuzin均不会影响Acrophilaphora，Collectotrichum，Didymella，Fusarium，Pythium，Macrophomina，Phomopsis，Rhizoctonia，Rhizopus属中的任何一个微生物对大豆的定殖。和木霉。可以通过适当的品种选择减轻树冠形成的延迟。