| Summary: | The aims of the research were to determine- index of AI saturation causing AI stress in chili and to identify chili genotypes tolerance to AI using root bioassay. The research had been carried out in University Farm of IPB in Cikabayan from September 2005 to January 2006. The media was Ultisol from Gajrug (Lebak, Banten) in polybags. Twenty genotypes of chili were tested at different level of AI saturation (0.77, 15.92, 31.96, 60.85 and 83.48%) by adding lime in different treatments (18.33, 13.75, 9.16, 4.58 and 0 g CaCO/kg soil, respectively). The tolerance to aluminum was determined by relative root length (RRL) value, i.e. the root length at AI-stress condition were compared to that without AI-stress condition. Screening results showed that 5 genotypes were potentially tolerant to AI, namely PBC 619, Jatilaba, Cilibangi 5, Jayapura dan Marathon
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