Impact of different concentrations of α-NAA and Kn on biomass partitioning and net primary production of Withania somnifera - an important medicinal plant.

Present study was conducted to evaluate the effect of growth regulators on biomass partitioning and net primary production of Withania somnifera at 1100 msl altitude exhibiting marked impact. Standing crop of biomass and net primary production of stem + leaves biomass, underground plant parts and fruit biomass increased consistently till last stage of growth in all the treatments. The maximum impact was reported for P9 (α-NAA 300 ppm + Kn 100 ppm) and minimum for P2 (α-NAA 100 ppm) treated plots. The combined effect of α-NAA and Kn enhanced the biomass favourably.