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Madeline Ryder, Compost Cats member and UA senior double majoring in natural resources and environmental studies, operates a tractor at San Xavier Co-op Farm as she turns one of the windrows of compost. (Photo: Braelyn Jane Smith) Madeline Ryder, Compost Cats member and UA senior double majoring in natural resources and environmental studies, operates a tractor at San Xavier Co-op Farm as she turns one of the windrows of compost.