Plenty of studies suggest that organic can be as or more productive than chemical intensive. A quick google produces the following from the University of Michig

Plenty of studies suggest that organic can be as or more productive than chemical intensive. A quick google produces the following from the University of Michigan: http://www.ns.umich.edu/htdocs/releases/story.php?id=5936 http://www.ns.umich.edu/htdocs/releases/story.php?id=5936