Urochloa decumbens plants may be reached by herbicide drift from applications of glyphosate from neighboring areas or by variations during applications. Considering the different phenological stages and size of plants in these areas, the amount of active ingredient that reaches the plants probably varies. The objective of this study was to evaluate the effects of the application of different doses of glyphosate on U. decumbens plants. Two greenhouse experiments were conducted with two replications at different times. The first experiment evaluated the biological response of U. decumbens plants to glyphosate doses (0, 2.81, 5.63, 11.25, 22.5, 45, 90, 180, 360, 720, and 1,440 g a.e. ha-1), with six replications. The second experiment evaluated the response of U. decumbens plants to the application of a selected low dose of 11.25 g a.e. ha-1. Evaluations of injury were performed at 0, 7, 14, and 21 days after application, and dry weight of plants was determined for each evaluation period. U. decumbens plants increased in dry weight when using the glyphosate dose of 11.25 g a.e. ha-1. However, plants had different responses to the application of this low dose. It can promote both stimulation and inhibition of plant growth.

中文翻译：

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草甘膦对卧草植物的激效作用。


斜卧尿草植物可能会因邻近地区施用草甘膦的除草剂漂移或施用过程中的变化而接触到。考虑到这些地区不同的物候阶段和植物的大小，到达植物的活性成分的量可能会有所不同。本研究的目的是评估施用不同剂量的草甘膦对斜卧 U. decumbens 植物的影响。两次温室实验在不同时间进行两次重复。第一个实验评估了斜卧 U. decumbens 植物对草甘膦剂量（0、2.81、5.63、11.25、22.5、45、90、180、360、720 和 1,440 g ae ha-1）的生物反应，重复六次。第二个实验评估了斜卧 U. decumbens 植物对施用选定的低剂量 11.25 g ae ha-1 的反应。在施用后0、7、14和21天进行损伤评估，并测定每个评估期的植物干重。当使用 11.25 g ae ha-1 的草甘膦剂量时，斜卧 U. decumbens 植物的干重增加。然而，植物对这种低剂量的应用有不同的反应。它可以促进刺激和抑制植物生长。