Oregon Revised Statutes Revenue and Taxation § 308A.059

(1) The Department of Revenue shall provide by rule for a more detailed definition of farm use, consistent with the general definition in ORS 308A.056, to be used by county assessors in determining qualification for special assessment under ORS 308A.068. The rules shall not be designed to exclude from the special assessment those lands that are in farm use as defined in ORS 308A.056 for which tax relief is intended.

(2) In determining qualification for special assessment under ORS 308A.068, the county assessor shall consider the use of the land by the owner, renter or operator thereof together with any other lands that are a part of one farming unit being operated by the owner, renter or operator.