PICLORAM DISPLACEMENT IN SOIL

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Abstract
Picloram movement was studied in a coarse-textured field soil of high pH and low organic matter content. The herbicide was applied in the spring to an existing brome-alfalfa stand at 1.12 and 2.24 kg ha−1 and its movement within the soil detected by sampling and bioassay. Water application treatments were seasonal rainfall and rainfall plus irrigations. Picloram was redistributed to depths approximately equal to where changes in moisture were recorded.Laboratory studies employing soil columns showed that picloram movement decreased as soil organic matter increased. The maximum effluent concentration decreased with an increase in organic matter content; however, the total recovery of the herbicide remained constant. Linear regression analyses related the retardation factor, which is directly related to the adsorption distribution coefficient, K, to the organic matter content and indicated the possibility of a clay involvement in the retardation factor. Picloram movement was studied in a coarse-textured field soil of high pH and low organic matter content. The herbicide was applied in the spring to an existing brome-alfalfa stand at 1.12 and 2.24 kg ha−1 and its movement within the soil detected by sampling and bioassay. Water application treatments were seasonal rainfall and rainfall plus irrigations. Picloram was redistributed to depths approximately equal to where changes in moisture were recorded. Laboratory studies employing soil columns showed that picloram movement decreased as soil organic matter increased. The maximum effluent concentration decreased with an increase in organic matter content; however, the total recovery of the herbicide remained constant. Linear regression analyses related the retardation factor, which is directly related to the adsorption distribution coefficient, K, to the organic matter content and indicated the possibility of a clay involvement in the retardation factor. © Williams & Wilkins 1976. All Rights Reserved.

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