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USDA, DuPont pair up on corn stover guidelines

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JOHNSTON, Iowa (AP) — U.S. Agriculture Secretary Tom Vilsack signed an agreement Friday with DuPont that will help establish guidelines for how the company will collect corn-plant residue for a new ethanol plant in central Iowa while maintaining soil quality. DuPont is building a $200 million plant in the town of Nevada that will use 375,000 tons of corn leaves and stalks, known as stover,...