Drift Distance in Aircraft Glyphosate Application Using Rice Plants as Indicators

IF 0.8 Q3 Agricultural and Biological Sciences
R. Córdova, M. Tomazetti, J. P. Refatti, D. Agostinetto, L. A. Avila, E. Camargo
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引用次数: 4

Abstract

ABSTRACT: This study aimed to evaluate the potential for glyphosate drift during aerial application using rice plants as sentinels, aiming to determine the effect of drift on irrigated rice crops. For this purpose, a field experiment was performed using an entirely randomized design with four replicates, evaluating different distances from the site of application [control (no application), 0, 12.5, 25, 50, 75, 100, 150, 200, 300, and 400 m]. The experiment was carried out at the Granjas 4 Irmãos farm, located in the Rio Grande city, Rio Grande do Sul State, Brazil. The glyphosate dose application was 1,920 g e.a. ha-1 (Roundup Transorb®, 480 g e.a. L-1 glyphosate isopropylamine salt). A dose-response curve was developed to estimate the drift rate in sentinel plants, by applying increasing glyphosate doses in rice plants and assessing the injury level. The drift rates estimated by the injury level in sentinel plants were 14% (150 m), 13% (200 m), and 5% (400 m). Death of the experimental units was observed for distances between 0 and 50 m, while in distances between 75 and 150 m, 25 to 50% of the plants survived, reducing productivity. In the distances between 200 and 400 m, there was no reduction in productivity when compared to the control, even when the injury levels reached 52 to 82%. Thus, we concluded that a 5% glyphosate drift reached up to 400 m from the application range. Considering the recommendation of zero drift, distances greater than 400 m should be adopted to avoid symptoms in rice plants. We suggest using distances of more than 400 m in future studies.
以水稻为指标的飞机草甘膦施用漂移距离研究
摘要/ ABSTRACT摘要:本研究以水稻植株为哨兵,评估草甘膦在空中施用过程中的漂移潜力,以确定漂移对灌溉水稻作物的影响。为此,采用完全随机设计进行了4个重复的田间试验,评估了与施用地点的不同距离[对照(未施用)、0、12.5、25、50、75、100、150、200、300和400 m]。试验在位于巴西南巴西格兰德州格兰德市的Granjas 4 irm os农场进行。草甘膦剂量为1920 g e.a. ha-1(农达Transorb®,480 g e.a. L-1草甘膦异丙胺盐)。通过增加草甘膦对水稻植株的剂量并评估危害程度,建立了剂量-反应曲线来估计哨点植株的漂移率。根据伤害水平估算的漂变率分别为14% (150 m)、13% (200 m)和5% (400 m)。在距离为0 ~ 50 m的区域,观察到实验单位的死亡,而在距离为75 ~ 150 m的区域,25 ~ 50%的植物存活,从而降低了生产力。在200至400米的距离内,即使损伤程度达到52%至82%,与对照相比,生产力也没有下降。因此,我们得出结论,5%的草甘膦漂移距离应用范围达400米。考虑到零漂移的建议,应采用大于400米的距离,以避免水稻植株出现症状。我们建议在未来的研究中使用超过400米的距离。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Planta Daninha
Planta Daninha Agricultural and Biological Sciences-Plant Science
自引率
0.00%
发文量
0
审稿时长
16 weeks
期刊介绍: Planta Daninha is a scientific journal published by the Brazilian Society of Weed Science (SBCPD - Sociedade Brasileira da Ciência das Plantas Daninhas). Papers submitted for publication must be sent through an electronic system, on http://www.scielo.br/pd. Works may be written in Portuguese, English, or Spanish, and will be accepted after being reviewed and approved by the Editorial Board. Only papers that have not been published or submitted for publication in other media will be accepted. Articles in Portuguese will be translated to English after being properly corrected and authorized by the authors. Planta Daninha has with goal to publish genuine technical-scientific papers and literature reviews from a critical perspective on Biology, weed management, and related topics.
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