T&D World Magazine

The Validity of an Estimation of Biomass

Herbicide efficacy for brush control has generally been determined by assessing treated stems for stem kill. The stem kill is measured by determining the condition of the cambium layer. The bark is stripped back on treated stems and a rating number is assigned (ie. 0-100%) based on how far down from the apex the cambium has been rendered non-viable.

This method is reasonable for many herbicides which are most active in meristematic tissue and where the brush species under study does not have a strong proclivity to reproduce vegetatively.

Right of way brush control needs to focus on the maintenance free period provided by the vegetation management treatment rather than on assessments of target species kill. Hence a measure of the rate and amount of regrowth is required...

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