LEACHING OF FOUR ORCHARD HERBICIDES IN SOIL COLUMNS

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Abstract
The mobility of four residual orchard herbicides, diuron, dichlobenil, simazine and terbacil was compared in soil columns using a sandy loam and loam soil common to the Okanagan Valley. Mobility for all herbicides was greater in the sandy loam than loam soil. Dichlobenil was least mobile in the soil columns followed by diuron, simazine then terbacil. No dichlobenil was leached through the 30-cm sandy loam soil column with 120 cm of water but 40 cm of water leached more than half of the terbacil. More dichlobenil was converted to the water-soluble 2,6-dichlorobenzamide in the loam soil than in the sandy soil. This metabolite is water-soluble and was partially leached through the loam soil column with the highest level of irrigation.