Japan’s National Federation of Agricultural Cooperative Associations said Tuesday it has tied up with U.S. chemical firm DuPont Co.’s seed division to secure stable supplies of non-genetically modified corn. Under a five-year contract, the federation, known as JA Zen-Noh, will commission Pioneer Hi-Bred International Inc. to develop non-genetically modified corn seeds and will provide the seeds to U.S. farmers in a bid to import non-genetically modified feed corn into Japan.