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Abstract
Distribution and dissipation of metolachlor [2‐chloro‐N‐(2‐ethyl‐6‐methylphenyl)‐N‐(2‐methoxy‐l‐methylethyl) acetamide] in a soil of Montpellier were evaluated in laboratory conditions for 8 weeks using 100 cm PVC pipes. The half‐lives of metolachlor varied from 31 to 54 days according to the application dose (1.2, 4.5 and 9 kg a.i./ha respectivelly). The rate of herbicide migration increased with stronger dose. Adsorption and desorption of metolachlor were studied in the same soil at three difierent depths. Soil Freundlich adsorption coefficients (Kfa ) were 1.0,0.7 and 0.6 for 0 to 10, 10 to 50 and 50 to 95 cm depths respectively. Desorption coefficients (K fd ) varied more slightly (3.6 ‐ 3.9). Ratio soil quantity/water volume may influence adsorption parameters.