(appeal from disqualification from farm use special assessment; assessor disqualified 18 acres of subject property from farm use after discovery land no longer being used as farmland; on appeal court held cattle grazing occurred for some period of time on property, but extent of use was unclear; no evidence presented of cattle grazing activities, such as Schedule F; evidence showed property used for running motorcycles by grandchildren; court held extent of cattle grazing not sufficient to meet farm use; court also held cultivation of Himalayan blackberry on property (a noxious weed) not acceptable farm use either; appeal denied).