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A qualidade da água, no que se refere aos teores de argila, matéria orgânica e sais solúveis, pode afetar a eficiência biológica dos herbicidas. O presente trabalho teve por objetivo determinar a condutividade elétrica, o pH e as curvas de acidificação de águas provenientes de poços artesianos, de arroios e de açudes para a aplicação de herbicidas no Rio Grande do Sul. As águas foram coletadas nas diferentes regiões produtoras do Estado e analisadas no Departamentos de Solos da Universidade Federal de Santa Maria (RS). As águas de poços artesianos apresentaram maior número de amostras com pH superior a 7,0, maior necessidade de ácido para baixar o seu pH e maior condutividade elétrica (CE) do que as águas de arroios e de açudes. Houve correlação positiva entre a CE da água e a necessidade de ácido para baixar o pH, e não houve correlação entre o pH original da água e a necessidade de ácido. A CE estabelece corretamente a necessidade de ácido clorídrico para baixar o pH. The water’s quality, referent to the clay amounts, organic matter and soluble salts, can affect the biological efficiency of herbicides. A study was made in the State of Rio Grande do Sul, Brazil, to determine pH, electrical conductivity, and acidification curves of water used in herbicide applications, from artesian wells, creeks and ponds. The 239 samples of water were collected in productive regions and the analyses were made at the Soils Department of the Federal University of Santa Maria. The water from artesian wells had a greater number of samples whose pH was higher than 7.0, high electrical conductivity, and required more acid to decrease the pH. The relationship between electrical conductivity of water and the need for acid to lower its pH to 4.0 was high and positive. The relation between the pH of water is not directly related to the electrical conductivity or need for acid. The electrical conductivity establishes correctly the need for chloride acid to lower the pH

Condutividade elétrica e acidificação de águas usadas na aplicação de herbicidas no Rio Grande do Sul