Leaching of mecoprop and dichlorprop in calcareous soil. Effect of the exogen organic matter addition in this process |
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Authors: | M. Matallo E. Romero A. Peña F. Sánchez Rasero G. Dios |
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Affiliation: | 1. Istituto Biológico , Avda. Conselheiro Rodrigues Alves 1252, 01402–023, Sao Paulo, Brazil;2. Estación Experimental del Zaidín (CSIC) , Profesor Albareda 1, E‐18008, Granada, Spain |
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Abstract: | Abstract Leaching studies of mecorprop (R,S)‐2‐(4‐chloro‐2‐methylphenoxy)propanoic acid, and dichlorprop, (R,S)‐2‐(4‐chloro‐2,4‐dichlorophenoxy) propanoic acid, under saturated conditions were conducted in unamended and amended soil columns. The purpose of the study was to investigate the leaching of these herbicides in three type of soils and the exogen organic matter effect on this process. The leaching patterns could be related to variation in the soil texture and diffusion processes of the herbicides into micropores within the walls of conducting pore. The leaching rate in the amended soil columns decreased with the addition of organic matter. The breakthrough curves (BTC) of these herbicides in the leachates of the amended soil columns were wider and more diffused than the BTC obtained for the corresponding unamended soil. The theoretical BTC overestimated the pore volume required for the displacement of these pesticides from the soil column. This may be due to the differences in the adsorption process between the bacth and soil columns methods |
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Keywords: | Leaching calcareous soil organic matter mecoprop dichlorprop herbicides |
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