ORS § 587.140
The owner of grain stored under this chapter is charged with the due care of the grain and shall exercise that degree of care and diligence which an ordinary and prudent person would exercise with regard to similar property of the person's own. The owner shall also, upon demand of the holder of the certificate and with the approval of the State Department of Agriculture, deliver the grain to the marketplace indicated in the application without charge to the holder. No legal demand for the delivery of the grain can be made, however, upon the owner until the maturity of the obligation for which the certificate is pledged, or until the security becomes in any way impaired; but the owner of the grain in the discretion of the owner with the approval of the department may sell the grain prior to the maturity of the obligation of the owner under the certificate.
ORS 587.140