Pedosphere 27(6): 1049--1061, 2017
ISSN 1002-0160/CN 32-1315/P
©2017 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Phosphorus-Mobilizing Rhizobacterial Strain Bacillus cereus GS6 Improves Symbiotic Efficiency of Soybean on an Aridisol Amended with Phosphorus-Enriched Compost
Muhammad Saleem ARIF1, Muhammad RIAZ1, Sher Muhammad SHAHZAD2, Tahira YASMEEN1, Shafaqat ALI1, Muhammad Javed AKHTAR3
1Department of Environmental Sciences and Engineering, Government College University Faisalabad, Faisalabad 38000 (Pakistan)
2Department of Soil & Environmental Sciences, University College of Agriculture, University of Sargodha, Sargodha 40100 (Pakistan)
3Institute of Soil & Environmental Science, University of Agriculture Faisalabad, Faisalabad 38040 (Pakistan)
Corresponding Author:Muhammad Saleem ARIF
      Legume plants are an essential component of sustainable farming systems. Phosphorus (P) deficiency is a significant constraint for legume production, especially in nutrient-poor soils of arid and semi-arid regions. In the present study, we conducted a pot experiment to evaluate the effects of a phosphorus-mobilizing plant-growth promoting rhizobacterial strain Bacillus cereus GS6, either alone or combined with phosphate-enriched compost (PEC) on the symbiotic (nodulation-N2 fixation) performance of soybean (Glycine max (L.) Merr.) on an Aridisol. The PEC was produced by composting food waste with addition of single super phosphate. The bacterial strain B. cereus GS6 showed considerable potential for P solubilization and mobilization by releasing carboxylates in insoluble P (rock phosphate)-enriched medium. Inoculation of B. cereus GS6 in combination with PEC application significantly improved nodulation and nodule N2 fixation efficiency. Compared to the control (without B. cereus GS6 and PEC), the combined application of B. cereus GS6 with PEC resulted in significantly higher accumulation of nitrogen (N), P, and potassium (K) in grain, shoot, and nodule. The N:P and P:K ratios in nodules were significantly altered by the application of PEC and B. cereus GS6, which reflected the important roles of P and K in symbiotic performance of soybean. The combined application of PEC and B. cereus GS6 also significantly increased the soil dehydrogenase and phosphomonoesterase activities, as well as the soil available N, P, and K contents. Significant positive relationships were found between soil organic carbon (C) content, dehydrogenase and phosphomonoesterase activities, and available N, P, and K contents. This study suggests that inoculation of P-mobilizing rhizobacteria, such as B. cereus GS6, in combination with PEC application might enhance legume productivity by improving nodulation and nodule N2 fixation efficiency.
Key Words:  arid and semi-arid regions, carboxylate, N2 fixation, nodulation, nutrient availability, nutrient-poor soils, plant growthpromoting rhizobacteria (PGPR), soil enzymes
Citation: Arif M S, Riaz M, Shahzad S M, Yasmeen T, Ali S, Akhtar M J. 2017. Phosphorus-mobilizing rhizobacterial strain Bacillus cereus GS6 improves symbiotic efficiency of soybean on an Aridisol amended with phosphorus-enriched compost. Pedosphere. 27(6): 1049–1061.
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