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首页> 外文期刊>Weed Science >Decision Rules for Postemergence Control of Pigweed (Amaranthus spp.) in Soybean (Glycine max)
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Decision Rules for Postemergence Control of Pigweed (Amaranthus spp.) in Soybean (Glycine max)

机译：大豆（Amaranthus spp。）豆中芽后控制的决策规则

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摘要

Weed control decision rules were derived for the application of postemergence herbicides to control pigweed species in soybean. Field experiments were conducted at two locations in 1992 and 1993 to evaluate soybean-pigweed interference. A damage function was determined that related yield loss to time of pigweed emergence, density, and soybean weed-free yield. A control function described pigweed species response to variable doses of imazethapyr and thifensul-furon. The integration of these two functions formed the basis of an economic model used to derive two weed control decision rules, the biologist's "threshold weed density" and the economist's "optimal dose." Time of weed emergence had a more significant role than weed density in the economic model. Later-emerging pigweed caused less yield loss and therefore, decision rules lead to overuse of herbicides if emergence time is not considered. The selected herbicide dose influenced the outcome of the control function. Depending on the desired level of weed control, a herbicide could be chosen to either eradicate the escaped weed species (label or biologically-effective doses) or reduce the growth of the weed species and thereby offset interference (optimal dose). The development of a biologically-effective dose by weed species matrix was recommended. Decision rules should not be utilized as an exclusive weed management strategy but rather as a component of an integrated weed management program.
机译：推导了杂草控制决策规则，以应用发芽后除草剂控制大豆中的杂草种类。 1992年和1993年在两个地点进行了田间试验，以评估大豆-猪杂草的干扰。确定了损害函数，其产量损失与杂草出苗时间，密度和大豆无杂草产量有关。对照功能描述了杂草物种对可变剂量的咪唑乙烟草和噻吩磺隆的反应。这两个功能的整合形成了用于导出两个杂草控制决策规则的经济学模型的基础，生物学规则是生物学家的“阈值杂草密度”和经济学家的“最佳剂量”。在经济模型中，杂草出现的时间比杂草密度更重要。后期出现的杂草引起的产量损失较小，因此，如果不考虑出苗时间，则决策规则会导致过度使用除草剂。选择的除草剂剂量影响控制功能的结果。根据所需的杂草控制水平，可以选择除草剂以根除逸出的杂草（标记或生物有效剂量）或减少杂草的生长，从而抵消干扰（最佳剂量）。推荐通过杂草物种基质开发生物有效剂量。决策规则不应被用作独家杂草管理策略，而应被用作综合杂草管理计划的组成部分。

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