âEducators need the equivalent of the tractor, contour plowing, and hybridization.â âCrop rotation, contour plowing, and the careful use of fertilizers and pest controls increased productivity, but the same techniques made it easier for bigger farms to become even more productive.â
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Author:Marcus Terentius Varro. Works. Works by this author published before January 1, 1923 are in the public domain worldwide because the author died at least 100 years ago. Translations or editions published later may be copyrighted.