Carrier based formulation of plant growth promoting Rhizobium species and their effect on albizia procera seedling

The carrier-based formulation of rhizobial cultures in general, excels to register their effects on various plant growth parameters of Albizia procera seedlings. Carrier based bio-inoculant prepared with rhizobial isolate FA6 of Uttrakhand performed better for all plant growth characteristics. Charcoal based application of rhizobial isolates also increased the N, P, K content of soil. In case of seedlings treated with charcoal-based formulation of rhizobial isolate from Himachal Pradesh maximum available N (323.30 kg/ha), P (38.97 kg/ha) and K (395.9 kg/ha) content was recorded in T2 (Charcoal based formulation of BA2 strain+20kg/ha N) which was significantly superior to T3 and uninoculated control. Among the charcoal-based formulation of rhizobial isolate from Uttrakhand seedlings under treatment T2 (Charcoal based formulation of FA6 strain+20kg/ha N) registered maximum available N (327.7kg/ha), P (39.01 kg/ha) and K (397.4 kg/ha) content in soil. Charcoal based application of rhizobial isolates significantly influenced the activity of soil enzymes (Dehydrogenase and Phosphatase). Application of Carrier based formulation of rhizobial isolate BA2 from Himachal Pradesh showed maximum dehydrogenase (11.20 μg TPF g-1h-1) and phosphatase (536.2 μmolL-1g-1h-1) activity as compare to uninoculated control. Whereas, among the rhizobial isolates from Uttrakhand maximum dehydrogenase (11.39 μg TPFg-1h-1) and phosphatase (545.4 μmol L-1g-1h-1) activity was also recorded with T2 (charcoal-based formulation of strain FA6+20kg/ha N) which was significantly superior to T3 and uninoculated control.