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Title: Evaluation of potassium solubilizing bacteria in tea fields for increased productivity and soil health
Researcher: Bagyalakshmi B
Guide(s): Ponmurugan P
Keywords: Agroclimatic zones
Black tea
potassium solubilizing bacteria (KSB)
Upload Date: 16-Apr-2014
University: Anna University
Completed Date: October, 2013
Abstract: The present research proposal was designed to evaluate the efficacy of indigenous potassium solubilizing bacteria (KSB) on the plant growth promotion of tea plants, potassium solubilizing ability, soil health maintenance and the quality attributes of black tea. The native KSB strains were isolated from southern Indian tea plantation soils collected from various agroclimatic zones, screened based on their potassium (K) solubilization efficiency and subsequently evaluated under field condition. In this study, six efficient strains among 152 isolates were selected based on their solubilization efficiency of various sources of potassium in Aleksandrov medium containing muriate of potash (MOP), sulphate of potash (SOP) and Montmorillonite. The results showed that K solubilizing efficiency of bacterial isolates on Aleksandrov medium was ranged between 0.30 and 1.41 cm. The population density of KSB strains were found to be high in the rhizosphere soils collected from China hybrids viz., UPASI-9 (18.5x x104/gm soil dry weight) and comparatively lesser with Assam hybrids viz., BSS-1 seedling plants. Distribution of population density in the rhizosphere region revealed that it was decreased when the distances as well as depth of soil sampling from the plant were increased. The southwest monsoon had profound influenced upon the population density of KSB at tea planting districts of Valparai, Munnar, Coonoor and Gudalur areas whereas Vandiperiyar and Koppa exhibited very less and benefited during northeast monsoon. K solubilization of the strain VKSB12 was ranged between 28.26 mg/l and 41.63 mg/l and MOP source was found to be preferred by KSB strains over SOP and montmorillonite sources. The order of K solubilization iv by KSB strains was in concordance with the usage of K source in tea plantations. Efforts were made to identify the selected six KSB strains by studying of their morphological, biochemical, physiological and molecular traits.
Pagination: xxvi, 169p.
Appears in Departments:Faculty of Science and Humanities

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01_title.pdfAttached File103.9 kBAdobe PDFView/Open
02_certificate.pdf2.23 MBAdobe PDFView/Open
03_abstract.pdf93.25 kBAdobe PDFView/Open
04_acknowldgement.pdf285.75 kBAdobe PDFView/Open
05_contents.pdf3.72 MBAdobe PDFView/Open
06_chapter1.pdf2.83 MBAdobe PDFView/Open
07_chapter2.pdf4.21 MBAdobe PDFView/Open
08_chapter3.pdf6.49 MBAdobe PDFView/Open
09_chapter4.pdf23.87 MBAdobe PDFView/Open
10_chapter5.pdf5.25 MBAdobe PDFView/Open
11_chapter6.pdf970.09 kBAdobe PDFView/Open
12_appendix.pdf256.26 kBAdobe PDFView/Open
13_references.pdf5.49 MBAdobe PDFView/Open
14_publications.pdf363.19 kBAdobe PDFView/Open
15_vitae.pdf292.97 kBAdobe PDFView/Open

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