(farm debtor borrowed money from co-op to finance crop input costs with co-op taking security interest in crops to be grown; debt excepted from discharge under 11 U.S.C. Sec. 523(a)(2)(B) because debtor submitted materially false documents to co-op for purpose of causing co-op to grant him financing; debtor also failed to tell co-op that he was feeding co-op's collateral to debtor's cattle; co-op justifiably relied on debtor's misrepresentations and suffered loss as a result).