Seed companies are seeking to increase production for corn and other crops as the U.S. tries to meet a mandate that requires the blending of 11.1 billion gallons of renewable fuel into gasoline this year. Pioneer Hi-Bred, a unit of DuPont Co., seeks to boost yields of its corn hybrids and soybean varieties by 40% within a decade. Monsanto seeks to double its crop output by 2030.

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