study was carried out during to evaluate the effectiveness of different aeration methods on keeping quality of freshly harvested rough rice during short term storage. Two different aeration methods were evaluated using two different types of air (natural and cooled air), and three different air flow rates,(0.02,0.04 and .06 m 3 /h.kg.). Seven lots of high moisture rough rice each of 25 kg were stored in laboratory scale metal silos for 15 days. Three lots aerated with natural air, three lots

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... ated with cooled air, and one lot was left without aeration as control. The effect of aeration methods on grain final quality was evaluated in terms of grain final moisture content, milling effectiveness, fungal growth rate and grain discoloration. The results show that, dry cooled air used for cooled aeration, reduced the grain moisture content to a range of 14.52 to16.93% w.b. as compared to 17.19 to18.96% w.d. for natural aeration. The ranges of air temperature and relative humidity used for aeration process were 11.01 to13.92 o C and 38.79 to 43.72% for refrigerated air respectively compared to 27.26 to 29.76 o C and 68.53 to76.15% for natural air respectively. The lower air temperature and relative humidity used for cooled aeration reduced the grain moisture content and temperature to a levels prevented spoilage and preserved the grain final quality as compared to natural aeration.