Phytotoxicity of 2,4-D and fipronil mixtures to three green manure species.

Autor: Ogura AP; PPG-SEA and NEEA/SHS, São Carlos School of Engineering, University of São Paulo, São Carlos, Brazil., Lima JZ; Department of Geotechnical Engineering, São Carlos School of Engineering, University of São Paulo, São Carlos, Brazil., Silva LCMD; PPG-SEA and NEEA/SHS, São Carlos School of Engineering, University of São Paulo, São Carlos, Brazil., Dias MA; Analytical Chemistry Department, Institute of Chemistry, University of Campinas, Campinas, Brazil., Rodrigues VGS; Department of Geotechnical Engineering, São Carlos School of Engineering, University of São Paulo, São Carlos, Brazil., Montagner CC; Analytical Chemistry Department, Institute of Chemistry, University of Campinas, Campinas, Brazil., Espíndola ELG; PPG-SEA and NEEA/SHS, São Carlos School of Engineering, University of São Paulo, São Carlos, Brazil.
Jazyk: angličtina
Zdroj: Journal of environmental science and health. Part. B, Pesticides, food contaminants, and agricultural wastes [J Environ Sci Health B] 2023; Vol. 58 (3), pp. 262-272. Date of Electronic Publication: 2023 Feb 17.
DOI: 10.1080/03601234.2023.2178789
Abstrakt: Sugarcane expansion has been associated with soil contamination by agrochemicals. Pesticides can affect plant growth, and their mixture might have potentiated effects on exposed species. This research aimed to evaluate the influence of fipronil on the phytotoxicity of 2,4-D on three green manure plant species: Canavalia ensiformis , Dolichos lablab , and Lupinus albus . Plants were exposed (for 21 days, at 25 °C) to a control soil and five concentrations of each pesticide and their combinations (36 treatments, considering a full-factorial approach). Effect concentrations of 50% growth inhibition (EC 50 ) were estimated. No phytotoxicity effects were identified when plants were exposed to different fipronil concentrations (up to 0.12 mg kg -1 ). All species exposed to 2,4-D showed a decrease in shoot and root length and fresh/dry biomass. L. albus and D. lablab roots showed the highest sensitivity when exposed to 2,4-D among the endpoints (EC 50 = 0.02 and 0.05 mg kg -1 , respectively), while C. ensiformis roots were the most tolerant (EC 50 = 0.98 mg kg -1 ). However, the interference of fipronil on the toxicity of 2,4-D was not detected in different mixture proportions, indicating no interaction between pesticides. Residues of 2,4-D might also impair other crops' growth, compromise productivity, and limit phytotechnologies for soil recovery.
Databáze: MEDLINE
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