Tordon herbicide disappearance from soils

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

Down Earth 20(4): 3-5


Accession: 014783819

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Tordon herbicide (4-amino, 3,5,6-trichloropicolinic acid), used for brush and deep-rooted perennial weeds, is less effective when applied to foliage than to the ground because of its persistence in the soil. Field trials in mid-West and Western states of from 1.44 to 4.2 lb/acre indicate losses of 58-96% within a year and 78-100% within 2 years after application. More is found in the upper foot of soil, but measurable amounts penetrate to 3-4 feet.