Abstract

Glyphosate can generate positive effects on turfgrass maintenance as a form of growth control by decreasing the expenses associated with mowing. However, there is little information about the effects of this herbicide on turfgrasses. This study aimed to evaluate the response of bermudagrass and zoysiagrass to the herbicide glyphosate as a growth regulator. Two studies were performed in a greenhouse and repeated at different times. The treatments involved application of glyphosate at 10 different rates (0, 5.625, 11.25, 22.5, 45, 90, 180, 360, 720, and 1.440 g ae ha⁻¹) with four replicates. Evaluations of green cover by digital analysis, injury, and plant height were performed at 7, 14, 21, and 28 days after application, and shoot dry matter of clippings was determined for the last evaluation period. Bermudagrass and zoysiagrass presented variedtolerance to glyphosate toxicity. Overall, the digital analysis showed that green content was negatively influenced by the increase in visual injury caused by glyphosate application. Moreover, increasing the glyphosate rate decreased plant height and shoot dry matter in both turfgrasses. Glyphosate application rates up to 45 g ae ha⁻¹ for bermudagrass and 90 g ae ha⁻¹ for zoysiagrass decreased plant growth without affecting the factors analyzed in this study.

 抽象的

草甘膦可以通过减少与割草相关的费用，作为生长控制的一种形式，对草坪维护产生积极影响。然而，关于这种除草剂对草坪的影响的信息很少。本研究旨在评估狗牙根和结缕草对作为生长调节剂的除草剂草甘膦的反应。两项研究在温室中进行并在不同时间重复。处理包括以10种不同的比率（0、5.625、11.25、22.5、45、90、180、360、720和1.440 g ae ha ^-1 ）施用草甘膦，重复四次。在施用后7、14、21和28天通过数字分析、损伤和株高对绿化覆盖率进行评估，并测定最后一个评估期的剪枝干物质。狗牙根和结缕草对草甘膦毒性表现出不同的耐受性。总体而言，数字分析表明，绿色含量受到草甘膦施用引起的视觉损伤增加的负面影响。此外，增加草甘膦施用量会降低两种草坪草的株高和芽干物质。狗牙根的草甘膦施用量高达 45 g ae ha ^-1 ，结缕草的草甘膦施用量高达 90 g ae ha ^-1 ，会降低植物生长，但不会影响本研究中分析的因素。