Studies on the efficacy of Rhizobium and PGPR consortia inoculants in Urdbean (Vigna mungo L.)
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Date
2021-01
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
The investigation was carried out to study the efficacy of Rhizobium and PGPR consortia inoculants in Urdbean (Vigna mungo L.). Compatibility of the used Rhizobium sp. and PGPR organisms was studied in laboratory and efficacy of their mono and consortia inoculants in urdbean was studied in field trial during kharif 2019 at N. E. B. Crop Research Centre, G. B. Pant Univ. of Agric. & Techn., Pantnagar. Ten treatments consisting inoculation with Rhizobium and PGPR strains, alone and as consortia, RDF and an uninoculated control were laid out in RBD in 3 replications. The test crop variety was Pant Urd-31. The results from in vitro studies indicated that the used Rhizobium sp. and PGPR strains were not having antagonistic interactions. Viable population of both the Rhizobium sp. and PGPRs was slightly more when grown together in consortia than individually in MSB. Individual or consortia inoculation treatments of Rhizobium sp. and PGPR increased the root nodule number numerically ranging from 17.3 to 36.9 % at 30 DAS, 3.6 to 36.6% at 45 DAS and 1.6 to 14.0% at 60 DAS, root nodule dry weight from 28.7 to 69.6% at 30 DAS, 5.8 to 32.0% at 45 DAS and 35.0 to 71.4% at 60 DAS and plant dry weight from 10.5 to 27.9% at 30 DAS, 3.8 to 22.5% at 45 DAS and 12.1 to 21.1% at 60 DAS over the uninoculated control. Grain yield due to different treatments showed significant increases of 17.3 to 35.1% while straw yield increased numerically from 12.4 to 24.0% over the uninoculated control. Inoculation of Rhizobium sp. and PGPR as individual and in consortia increased grain N content, by 4.8 to 10.1%, straw N content, by 24.5 to 49.0 %, grain N uptake, by 26.3 to 48.7% and straw N uptake, by 49.2 to 80.3% over the uninoculated control. Different inoculated treatments also numerically increased the grain and straw P content from 6.9 to 14.2% and 17.4 to 37.3% and P uptake from 25.4 to 53.8% and 32.8 to 71.2% over the uninoculated control, respectively. All the treatments, except PUK-171 and PUK-46B6, improved the available N in soil, by 7.3 to 24.5% and available P, by 10.9 to 47.4%, over the uninoculated control. Individual or consortia inoculation treatments of Rhizobium sp. and PGPR significantly improved the activities of dehydrogenase, acid and alkaline phosphomonoesterases in soil ranging from 7.6 to 25.3 %, 21.2 to 46.6% and significantly from 46.96 to 116.6%, respectively. Consortia inoculant of PUR-34 + PUK-46B6 was found most efficient by registering maximum net return of Rs. 54759 ha-1 and B:C ratio of 2.35 than others. It was followed by consortia inoculants of A-3 + PUK-46B6 and PUR-34 + PUK-171 in performance.