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The second paragraph on page 954 reads: Net economic return of corn and soybean production was calculated based on tillage cost estimates (Lazarus and Selley, 2005), corn and soybean yields from 2000 through 2002, and $29 and $73 Mg–1 prices (USDA "county loan rate") of corn and soybean, respectively.
The prices are incorrect, they should read "$72 and $180 Mg–1."
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