Response of maize grown in an alfisol of sri lanka to inoculants of plant growth promoting rhizobacteria
2012
Katulanda, Panachali | Rajapaksha, Chandanie P.
Field experiments were conducted to assess the ability of rhizobacterial inoculants to enhance growth and yield of maize. Performances of two phosphorus (P)-solubilizing bacteria in combination with a fertilizer mixture containing rock phosphate and triple super phosphate (PFM), and five diazotrophs combining either with 150 kg or 100 kg nitrogen (N) ha⁻¹ supplied as urea were compared with non-inoculated-fertilized controls. Shoot P and N and soil available P and N contents were assessed and shoot biomass and ear weights were recorded at harvest. Pseudomonas cepacia resulted in significantly higher available P (51 mg P kg⁻¹ soil), P accumulation (3.6 g kg⁻¹ dry matter) and 13% increase in shoot biomass over control. Azospirillum sp. and dual inoculant comprising Enterobacter agglomerans + Agrobacterium radiobacter led to significantly higher available N (74–94 mg kg⁻¹ soil) and 19 to 26% increase in shoot biomass over the control. However, inoculants did not increase the yield significantly.
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