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Indigenous PGPR’s and Chemical Fertilizers: Impact on Wheat (Triticum aestivum L.) Productivity and Soil Properties in North Western Himalayan Region
High levels of crop productivity cannot be sustained by chemical fertilizer application only, so as to mitigate this two year study was conducted to test the effects of conjoint application of indigenous PGPR (Plant Growth Promoting Rhizobacteria) and chemical fertilizers levels mainly on productivity of wheat and soil properties. Ten morphologically distinct indigenous PGPR isolates from wheat roots and rhizosphere were evaluated at Solan, Himachal Pradesh (India) during 2013-2014. Three best PGPR isolates (B2, SIR1 and BIS2) having maximum PGP (Plant Growth Promoting) traits were screened at different doses (80, 60 and 40% of recommended doses of NP) under net house conditions and finally two isolates B2 (Serratia spp.) and SIR1 (Bacillus subtilis) along with optimum dose i.e. 80% of NP were selected for field experimentation, which was performed for two years consecutively i.e. 2014-2016 under RBD Design, replicated seven times. Conjoint application of 80% recommended doses of NP (Nitrogen and Phosphorous) with PGPR (B2) significantly increased wheat yield by 9.4%, number of tiller per plant by 28.03%, grain number per spike by 19.61%, 1000 grain weight by 10.5% and biomass by 9.2%, over uninoculated control (100% RDF of chemical fertilizer). Soil properties in the terms of available N, P and K, microbial biomass carbon, soil enzyme activities and PSB (Phosphate Solubilizing Bacteria) population in wheat crop was significantly increased by the conjoint application of bacterial inoculants with optimized doses (80% N and P) of fertilizers in both years over uninoculated control. Therefore, results revealed the potential of indigenous PGPR isolates to supplement about 20% NP fertilizers without hampering the soil fertility and productivity of wheat.
CP18016 Accepted 05 February 2018
© CSIRO 2018