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162 comments on Weekend Energy Listening: Ethanol's Energy Balance with Tad Patzek
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Wrong. Switchgrass does not fix nitrogen like members of the legume family http://www.extension.iastate.edu/Publications/AG200.pdf. Moreover, corn is rotated with soybeans (and winter wheat in areas such as where I live) so that the corn does not deplete the fields so rapidly. Even with rotation nitrogen must be applied for corn.
You're correct, Switch Grass is a C4 Carbon Fixer, not a nitrogen fixer.