Prediction of the persistence and activity of Tordon herbicide in soils under field conditions

Hamaker, J.W.; Youngson, C.R.; Goring, C.A.I.

Down to Earth 23(2): 30-36


ISSN/ISBN: 0012-5792
Accession: 014615269

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Plots in 18 States and Provinces of the USA and Canada were analysed for Tordon (picloram) at varying intervals after application. Annual rainfall ranged from 7 to 40 in. Most of the herbicide recovered was found in the top 1 ft of soil. The rate of dissipation was expressed in terms of half-order kinetics, and the observed half-order constants averaged for each State or Province. Values ranged from 0.12 for Saskatchewan to 0.79 for Texas.