Evaluation of Liquid Bio-inoculants for Production of Plant Growth Promoting Hormones and their Effect on Growth of Amaranthus (Amaranthus cruentus)

摘要

An investigation was carried out to assess the ability of liquid bio-inoculants viz., Azotobacter chroococcum, Bacillus megaterium, Frateuria aurentia, Psuedomonas fluorescens, Bacillus subtilis and Trichoderma viridae for production of plant growth hormones and study their effect on growth of Amaranthus {Amaranthus cruentus). Bio-assay was conducted for production of GA, IAA and Cytokinin. It was noticed to be significantly highest in Psuedomonasfluorescens (4.75ug, 180.07 ug and 4.94 ug of GA, IAAand Cytokinin, respectively) and least was recorded in Trichoderma viridae (1.43 ug, 9.32 ug, 0.88 mug of GA, IAA and Cytokinin, respectively). The results of green house studies revealed that the plants inoculated with a consortia of A. chroococcum + B.megaterium + F. aurentia + P. fluorescens + B. subtilis + T. viridae recorded significantly highest plant height (8.82 cm, 29.00 cm and 40.87 cm), highest number of leaves (6.23, 9.13 and 12.57) at 15 DAS, 21 DAS and 30 DAS, respectively, maximum root and shoot length (7.80 cm and 40.87 cm, respectively) as well as root and shoot fresh weight and dry weight at harvest.