Oregon Revised Statutes Revenue and Taxation § 307.390

Mobile field incinerators owned by farmers or by groups of farmers that are exclusively used for sanitizing grass seed fields by means other than open field burning shall be exempt from taxation if they are purchased within five years after they are certified as a feasible alternative to open field burnings by the Department of Environmental Quality pursuant to ORS 468A.555 to 468A.620 and 468A.992.