Good to hear somebodies spent the time, and money, to do the research.  We've had anecdotal evidence up the wazoo for decades.  Now we can point to some objective evidence.

And then there is, From the abstract [emphasis added]:

Evaluation and review of this paper have raised important issues about crop rotations under organic versus conventional agriculture and the reliability of grey-literature sources.

"Grey-literature" refers to publications issued by government, academia, business, and industry, in both print and electronic formats, but not controlled by commercial publishing interests, and where publishing is not the primary business activity of the organization.

Wow.

The authors of the paper just called the ag-industry, their paid hacks, and govermental ag-departments a bunch of liars.  

She believed in nothing; only her skepticism kept her from being an atheist. -- Jean-Paul Sartre