ORS § 308A.050
The Legislative Assembly recognizes that agriculture and related land uses contribute significantly to Oregon's character and economy. The Legislative Assembly finds that providing the means for agriculture to continue and prosper is in the interest of all residents of this state, who benefit directly or indirectly from agricultural production and stewardship of farmlands and ranchlands. Valuation of farm properties based upon market data from sales for investment or other purposes not connected with bona fide farm use encourages the conversion of agricultural land to other uses. The identification of agricultural land for farm use, as provided by law, substantially limits alternative uses of such land and justifies the valuation of that land based on its agricultural production capability. Therefore, it is the declared intent of the Legislative Assembly that bona fide farm properties be assessed for ad valorem property tax purposes at a value that is exclusive of values attributable to urban influences or speculative purposes.
ORS 308A.050