Or. Admin. R. 603-095-5035 – Control Measures for Irrigated Agriculture on Large Acreages

(1) The provisions of OAR 603-095-5035 – 5065 govern agricultural activities on agricultural land where the total land acreage under the ownership or control of a landowner is equal to or greater than 500 acres and where irrigation is used to grow crops on those acreages.
(2) In addition to conducting agricultural activities consistent with OAR 603-095-5000 – 5030, a landowner subject to this rule shall prepare an annual nitrogen plan as described in OAR 603-095-5040 and OAR 603-095-5045, prepare annual post-harvest summary records as provided in OAR 603-095-5050, evaluate performance under an annual nitrogen plan and implement adaptive management measures as described in OAR 603-095-5055, certify plans as specified in OAR 603-095-5060, and collect soil samples according to the protocol in OAR 603-095-5065.
(3) Documents created as specified in OAR 603-095-5040 – 5055 shall be retained for ten calendar years at the agricultural operation and made available for inspection at the request of the department.

ORS 561.191 & ORS 568.900-933

ORS 568.900-933 & 468B.025(1)