>
> http://www.tandfonline.com/doi/abs/10.1080/14735903.2013.806408#.UcMvm-dafCo
>
> very interesting so far.
>

Also not very good in substantiating the headline. For example:

Likewise, wheat yields have been consistently higher in W. Europe than in
> the United States, on average by 31,400 hg/ha from 1961 to 2011 (Figure 2<http://www.tandfonline.com/doi/full/10.1080/14735903.2013.806408#F0002>).
> While wheat yields significantly increased over time in both countries
> (ANCOVA: *F* 1,98 = 610.525, *P* < 0.0001), the increase per annum was
> significantly higher in W. Europe than in the United States (ANCOVA: *F*
> 1,98 = 44.674, *P* < 0.0001). GM wheat is not used in either
> agroecosystem. This again indicates that yield gains are not dependent on
> GM biotechnologies and that the combination of biotechnologies used by W.
> Europe is demonstrating greater productivity than the combination used by
> the United States.
>

The main point of the whole article is that some countries do it better
than others and that there are too many producing the same thing so there
is less diversity in specific crops, like corn. Something that has been
around (as they note) well before GMO ever came on the scene.

It is all a statistical study. There is little in depth study to see why
there are differences. Just this number is bigger or small than the other
so they must be doing it right.

Bill Truesdell
Bath, Maine

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