Leaching of saflufenacil and tebuthiuron in contrasting texture soils submitted to different pluviometric precipitations
DOI:
https://doi.org/10.6008/CBPC2179-6858.2021.012.0004Keywords:
Bioassay, Herbicides, Mobility, Soil depthAbstract
The objective was to evaluate the leaching potential of saflufenacil and tebuthiuron in soils with contrasting texture, Red Latosol - LV and Neossolo Quartzarenico-NQ, submitted to different rainfall, using the bioassay method. The experiments were conducted in a greenhouse, consisting of applications of saflufenacil (LV – 0,140 kg ha-1 and NQ – 0,105 kg ha-1) and tebuthiuron (LV – 1,5 kg ha-1 and NQ – 1,0 kg ha-1), at the top of the soil columns. Four experiments were conducted, with each experiment using a herbicide (saflufenacil or tebuthiuron) and a soil (LV - clay texture or NQ - sandy texture) in a 6 x 6 + 1 factorial scheme, with three repetitions, arranged in randomized blocks . The factors studied were simulated rainfall (0, 20, 40, 60, 80 and 100 mm) and column depths (0-5; 5-10; 10-15; 15-20; 20-25 and 25-30 cm), in addition to the control (0 mm and 0 g ha-1). After simulating rainfall, the columns were cut longitudinally and along the columns the bioindicator plants (Cucumis sativus) were sown, and 21 days after sowing the control was evaluated. Saflufenacil showed leaching up to the 25-30 cm deep layer, with the application of water slides of 40, 60, 80 and 100 mm, regardless of the soil texture. The tebuthiuron leached up to the 25-30 cm deep layer in LV for 60, 80 and 100 mm rainfall, while in NQ soil, the tebuthiuron leached in all layers of the soil columns (0-30 cm ) with precipitations from 0 to 100 mm. It is concluded that saflufenacil showed greater leaching with high rainfall, regardless of the soil texture, and the leaching of the tebuthiuron was influenced by the soil texture and rainfall, where it reached greater depths of the soil with sandy texture (NQ).
Downloads
Downloads
Published
Issue
Section
License
Copyright (c) 2021 Ibero-American Journal of Environmental Sciences
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
The CBPC - Companhia Brasileira de Produção Científica (Brazil CNPJ: 11.221.422/0001-03) the material rights of the published works. The rights relate to the publication of the work anywhere in the world, including rights to renewals, expansions and dissemination of the contribution, as well as other subsidiary rights. All electronically published works may subsequently be published in printed collections under the coordination of this company and / or its partners. The authors preserve the copyright, but are not allowed to publish the contribution in another medium, printed or digital, in Portuguese or in translation.