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The experiment was conducted to investigate the combined effect of different plant growth regulators with and without charcoal supplementation for root formation and plantlet development from protocorm like bodies (PLBS) of orchid. The combination of BAP + NAA, BAP + IAA, BAP + IBA, and IAA + IBA at different concentrations were studied. It revealed that the highest number of roots was obtained from 1.0 mg/L each of IAA + IBA combination (6.667) and the highest root length was recorded from 2.0doi:10.3329/bjar.v35i2.5888 fatcat:4nlvumisrfef7mtwhwfnunn3iq