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In China, where farms use enough plastic film to cover the surface area of Idaho every year, the difficulty of end-of-season removal led growers, at one point, to plow the plastic directly into the field. Rodale has even designed an add-on device for tractors, making the blueprint publicly available.)
Diesel-powered tractors replaced horse-powered plows, and synthetic nitrogen fertilizers replaced their manure. Department of Agriculture programs encouraged their adoption with financial assistance that enabled big purchases like tractors as well as smaller annual purchases of newly improved hybrid corn seeds.
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