Influence of Azospirillum and plant growth regulators on growth, yield and alkaloid content of Ashwagandha (Withania somnifera Dunal.)
The study revealed that the combination of Azospirillum along with CCC at the rate of 2000 ppm retarded the plant height (59.23 cm) and simultaneously increased the root growth such as root diameter (2.54 cm) and root yield (9.18 q ha-1). Similarly, the ethrel at the rate of 250 ppm retarded the plant height (69.04 cm) and produced more number of roots (8.98) it had resulted in moderate root yield (7.68 q ha-1). IBA at the rate of 100 ppm increased the plant height (102.98 cm) and root length (60.21 cm) with moderate root yield (5.59 q ha-1) whereas; MH at the rate of 500 ppm had the detrimental effect on the plant growth and root yield. The total alkaloid content and alkaloid yield of 1.362 per cent and 12.50 kg ha-1 were significantly enhanced by the application of CCC at the rate of 2000 ppm.