The addition of dicamba as a weed control option in soybean [Glycine max (L.) Merr.] is a valuable tool. However, this technology must be utilized with other herbicide sites of action (SOAs) to reduce selection pressure on weed communities and ensure its prolonged usefulness. A long-term trial was conducted for 7 yr in Indiana to evaluate weed community densities and species richness with four levels of dicamba selection pressure in a corn (Zea mays L.)–soybean rotation. Monocot densities and richness increased over time in the dicamba-reliant treatment. Dicot densities in the dicamba-reliant treatment declined over time, but dicot richness increased. The soil weed seedbank was affected by the varying herbicide strategies. The dicamba-reliant strategy had greater than 43% higher total weed density than all other treatments, primarily due to having a monocot density that was at least 71% higher than the other treatments. The fully diversified strategy with eight SOAs and residual herbicides used every year had the lowest total weed species richness in the soil seedbank, which supported the in-field observations.

中文翻译：

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除草剂管理措施对印第安纳州麦草畏抗性种植系统杂草密度和丰富度的影响

添加麦草畏作为大豆中的杂草控制选项 [最大甘氨酸(L.) Merr.] 是一个有价值的工具。然而，这项技术必须与其他除草剂作用位点 (SOA) 一起使用，以减少对杂草群落的选择压力并确保其长期有用性。在印第安纳州进行了一项为期 7 年的长期试验，以评估玉米中麦草畏选择压力的四个水平的杂草群落密度和物种丰富度。玉米L.)——大豆轮作。在依赖麦草畏的治疗中，单子叶植物的密度和丰富度随着时间的推移而增加。依赖麦草畏的处理中的双子叶植物密度随着时间的推移而下降，但双子叶植物的丰富度增加。土壤杂草种子库受到不同除草剂策略的影响。依赖麦草畏的策略的总杂草密度比所有其他处理高 43% 以上，这主要是因为单子叶植物密度比其他处理高至少 71%。每年使用八种 SOA 和残留除草剂的完全多样化策略在土壤种子库中的总杂草物种丰富度最低，这支持了现场观察。