Abstract

RODRIGUEZ-CAMACHO, Ana Gabriela et al. Mobility of atrazine in two types of soil in the state of Puebla. Rev. Mex. Cienc. Agríc [online]. 2021, vol.12, n.2, pp.291-304.  Epub Apr 25, 2022. ISSN 2007-0934.  https://doi.org/10.29312/remexca.v12i2.2425.

Surface and groundwater contamination by herbicides such as atrazine occurs by leaching through the soil profile. The objective of the study was to evaluate the mobility of atrazine in plots dedicated to maize cultivation, each with a different type of soil located in the municipalities of San Nicolás Buenos Aires (Regosol) and Los Reyes de Juárez (Calcisol), Puebla, Mexico. Displacement experiments were conducted on soil packed columns (8.5 cm in diameter and 30 cm in length). An aqueous concentration of 6.25 g L-1 of atrazine (Gesaprim®) was applied to each column. First, a pore volume of a soil restorative solution (without atrazine) was used and subsequently, 30 volumes of irrigation water pore containing atrazine were applied. The leachates and three depths of the soil columns (0-2 cm, 2-10 cm and 10-20 cm, respectively) were analyzed. Pearson’s correlation results showed that organic material, texture and cation exchange capacity were the physicochemical characteristics of the soil that affect the mobility of atrazine. Atrazine had a delay coefficient of 1.08 in Regosol and 1.03 in Calcisol. The transport of the herbicide was nine times faster in the Regosol compared to Calcisol. Atrazine was retained in a greater amount in the first two centimeters of soil columns. The degraded mass percentage of atrazine was 94% for Regosol and 69% for Calcisol.

Keywords : atrazine mobility; Calcisol; corn crop; Regosol.

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