A FIRE that burnt through more than 500 hectares of land south of Ouyen was caused by harvesting equipment, the CFA says.

Firefighters were called to fight the grass and shrub fire about 2.20pm Sunday.

Seventeen units and three aircraft from Lascelles, Mittyack, Speed, Turriff, Nandaly, Patchewollock, Tempy, Underbool, Ouyen and Walpeup helped fight the blaze, which remained out of control for m...