The full paper is available at http://www.sciencedirect.com/science/article/pii/S0308814613019201
There was NO attempt to normalize for differing management practices. That was not the point of their analysis. It was a false assumption to have guessed that "both the 'GMO' and 'conventional' crops were treated with similar levels of Round-Up (Glyphosate)". They were not. The Round-Up-ready crops were subjected to substantially higher levels of glyphosate during cultivation than the other crops in the study. So, yes, the paper does merely detect differences in cultivation practices.
That does not necessarily make the paper a "blatant sham" but it does highlight the dangers of jumping to conclusions based on an abstract rather than based upon the full information.
Mike Rossander
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