Okla. Stat. tit. 42, § 42-116: Sale for purpose of paying threshing or combining bill

The owner, when said seed or grain is not mortgaged, and the

owner with the written consent of the mortgagee, when said seed or

grain is mortgaged, may sell or dispose of not to exceed twenty

percent (20%) of said grain or seed for the purpose of paying the

threshing or combining bill.