Cellulose degrading bacteria, Decomposition, Green manure, Maize, Microbial dynamics, Nutrient mineralization, Yield
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Date
2019
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Punjab Agricultural University, Ludhiana
Abstract
Thirty four rhizobacterial isolates were isolated from mungbean rhizosphere soil
collected from different locations of the Punjab. The isolates were evaluated for their
PGP traits at 35°Cand 40°C but, it was found that rhizobacteria were more acclimatized
to 35°C as compared to 40°C. All the isolates showed IAA production at 35°C (0.13-
56.44μg/ml) and (0.22-36.80μg/ml) at 40°C. The isolates were effective P and Zn
solubilizers with P-solubilisation index ranging from 6.9-15.5 at 35°C and from 5-13.8 at
40°C. Zn solubilisation index ranging from 3.8-24.0 at 35°C and 4.6-15.3 at 40°C, most
potent isolates being G-2, G-3, G-33 and G-34. Isolates G-2, G-3, G-33 and G-34 were
HCN and ammonia producers as well. The biocidal impact of the rhizobacterial isolates
against F.oxysporum and R.solani was studied and eight isolates showed antagonistic
activity against F. oxysporum and R. solani. Isolates G-2, G-3, G-33 and G-34 proved to
be strong antagonistics with 27.0-37.5% inhibition of the phytopathogens. The field
experiment conducted revealed that co-inoculation of Rhizobium and G-33 proved to be
the most beneficial, resulting in the improvement of symbiotic traits viz nodule number
per plant (66.6), nodule dry weight (22.2 mg/plant), root (0.29g/plant) and shoot
(11.84g/plant) dry weight and the yield (1134 kg/ha) of mung bean (ML2056) as
compared to Rhizobium treatment alone (1093 kg/ha).
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