Twenty four upland rice cultivars from East Kalimantan and control cultivar were evaluated for tolerance to aluminium using nutrient culture with two treatments of 0 ppm and 45 ppm AI. Result showed that eight cultivars (Pimping, Ketan Hitam, Mayas, Padi Bulu, Popot, Siam Kuning, Ketan Merah, Serai) have PAR > 0.5 and were categorized as tolerant cultivar, the other 16 cultivars were categorized as suceptable. Three tolerant cultivars: Pimping, Ketan Merah and Mayas. even have PAR higher than a control, Krowal. Key words: Rice, AI, PAR, Nutrient
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