Canadian Forest Service Publications

Persistence movement and degradation of glyphosate in selected Canadian boreal forest soils. 1989. Roy, D.N.; Konar, S.K.; Banerjee, S.; Charles, D.A.; Thompson, D.G.; Prasad, R.P. Journal of Agricultural and Food Chemistry 37(2): 437-440.

Year: 1989

Issued by: Pacific Forestry Centre

Catalog ID: 20618

Language: English

Availability: PDF (request by e-mail)

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Abstract

Persistence, mobility, and degradation studies of glyphosate, N-(phosphonomethyl)glycine, under actual field conditions of boreal forest soils of Ontario, were undertaken after spraying Roundup at the rate of 2 kg of active ingredient (AI)/ha. Soils at three depths were collected and analyzed for residues of glyphosate and its metabolite (aminomethyl)phosphonic acid. Glyphosate was found to remain consistently to a level below 50% of the highest residue values observed beyond 24 days. More than 95% of the total herbicide residue was found in the upper organic layer at any time. There was no evidence of lateral movement of the glyphosate either in runoff water or through subsurface flow. In general, concentrations of the metabolite (aminomethyl)phosphonic acid were very low.