Department of Soil Science and Agricultural Chemistry, University of Agricultural Sciences, Bangalore-560 065, India.
*Present address for correspondence Asst. Professor, Dept. of Soil Science & Agril. Chemistry. College of Agriculture, Shimoga-577 201, Karnataka
Online published on 31 October, 2011.
The relative mobilities of butachlor and 14C labelled pendimethalin in three soils namely Hiriyur clay (Haplustert), Mandya sandy clay loam (Ustropept) and Mudigere sandy clay loam (Kanhaplohumult) were studied in soil columns. Chemicals were applied at 5 mg kg−1 of soil and the soil leached for 24 hours. Both herbicides remained primarily in the top soil layers. The mobility of pendimethalin was less in all the soils compared to butachlor. The herbicide mobilities were inversely related to clay and organic matter content and the Freundlich sorption constant. The mobility of both herbicides was more in Mudigere sandy clay loam soil than in other two soils. The relative mobility of these herbicides was influenced mainly by water solubility, sorption, soil texture and hydraulic conductivity of the soils.
Mobility index, leaching, butachlor, pendimethalin
