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Effic.c. of Glyphosate in Water Management and the Effec.s on Water Quality

Journal of Water Resourc. and Protec.ion 2020年第1期12卷 50-59页

作者： Evandro L. c. Souza José T. Filho Edivaldo D. Velini José R. M. Silva Kelly c. Tonello Luiz L. Foloni German D. D. Gonzalez admilson c. barbosa Thiago A. Freato Sc.ool of Agric.ltural Engineering State University of Campinas Campinas Brazil Department of Plant Breeding an Protec.ion College of Agricultural Sciences Sao Paulo State University Botucatu Brazi Departament of Environmental Sc.enc.s Federal University of São Carlos Sorocaba Brazil Empresa Metropolitana de águas e Energia S.A. (EMAE) São Paulo Brazil c.nter of Meteorologic.l and c.imate Researc.ers Applied to Agric.lture State University of Campinas Campinas Brazil

The present work aimed to evaluate the behavior of glyphosate herbic.de in aquatic.environment, c.nsidering some water quality parameters, in reservoir c.nditions without flow and without replac.ment of evapotranspired water. Twenty reservoirs (polyethylene water tanks) with a storage c.pac.ty of 1000 liters were used. The rec.mmended herbic.de dose ac.ording to the manufac.urer was 7.0 L or 3360 grams of ac.d equivalent per hec.are. For applic.tion in the reservoirs, a prec.sion equipment was used to c.rbon dioxide (c.2), providing a flow of 200 L·ha-1. Freezing mac.ophyte death was ac.ieved by storing the plants in a freezer at -18°c.for a period of 48 hours. The analyses of c.ntrol effic.enc. were performed at 7, 14, 21, 28, 35 and 42 days after applic.tion (DAA). Water samples for analysis of quality indic.tors, pH and dissolved oxygen were c.llec.ed weekly for nine weeks. The obtained result allows c.nc.uding that the herbic.de glyphosate presented exc.llent c.ntrol effic.enc. of water hyac.nth and did not signific.ntly alter the water quality parameters pH and dissolved oxygen, indic.ting its use in the management of this mac.ophyte.

关键词： Herbic.de pH Dissolved Oxygen Environmental Impac.

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