IN VITRO EVALUATION OF POTASSIUM SOLUBILIZING POTENTIAL OF SOME RHIZOSPHERE PSEUDOMONAS STRAINS FROM MAHARASHTRA, INDIA

N.S. GORE¹*, A.M. NAVALE^2
1Department of Plant Pathology and Agricultural Microbiology, Mahatma Phule Krishi Vidyapeeth, Rahuri 413 722, Ahmednagar, MS, India; * MGMs Institute of Biosciences and Technology, N-6, Cidco, Aurangabad, MS, India
²Department of Plant Pathology and Agricultural Microbiology, Mahatma Phule Krishi Vidyapeeth, Rahuri 413 722, Ahmednagar, MS, India
* Corresponding Author : goreneel@gmail.com

Received : 10-07-2019     Accepted : 26-07-2019     Published : 30-07-2019
Volume : 11     Issue : 14       Pages : 8807 - 8811
Int J Agr Sci 11.14 (2019):8807-8811

Keywords : Solubilization, Mica, Rhizospheric potassium solubilizing microorganisms, K form
Academic Editor : Dr Aniket P. Sarkate, Dr D. B. Shinde, Maheshwari Veena
Conflict of Interest : None declared
Acknowledgements/Funding : Authors are thankful to DST, New Delhi for the INSPIRE Fellowship. Authors are also thankful to Department of Plant Pathology and Agricultural Microbiology, Mahatma Phule Krishi Vidyapeeth, Rahuri, 413 722, Ahmednagar, MS, India
Author Contribution : All authors equally contributed

Forty two potassium (K) solubilizing bacterial (KSB) isolates were isolated from banana rhizosphere soils of Western and Northern Maharashtra, India. Among all three bacterial isolates have been found promising solubilizers of potassium mineral (Mica). The amount of potassium released from muscovite mica by the isolate KSB 49 (239.75 mgl-1) at 8 days after incubation, recorded the highest potassium solubilization followed by KSB 43 (228.25 mgl-1) than commercially used KSB (CKSB1, F. aurantia) (221.25 mgl-1) and control showed 42.81 mgl-1. Based on the cultural, morphological and biochemical tests, these three isolates were identified as Pseudomonas spp. Among all KSB isolates and commercially used KSB strain (CKSB 1), KSB 49 was showed highest zone of solubilization of potassium from K2SO4 and KCl 27.03 mm and 25.00 mm, respectively. Use of low grade, locally available soil mineral such as mica, may be efficiently used with potassium solubilizing bacteria as biofertilizers that can replace chemical fertilizers thus reducing the cost of crop production.

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