A comparison was made between alternate air conditioning methods used to dry large round forage bales. Energy consumption durin drying and the final nutritional qualit of the bales were measured durin ti% study. The methods used to increase tge drying potential of the air incfuded using a desiccant to dehumidify the drying air; a gasoline engine to drive the fan and heat the drying air and the use of direct electric heat to increase the temperature of the dr ing air.