Journal
BIORESOURCE TECHNOLOGY
Volume 222, Issue -, Pages 165-174Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2016.09.115
Keywords
Vermicomposting; Eisenia fetida; Gut bacteria; Soil quality; Crop growth
Funding
- Department of Biotechnology (DBT - India), Govt. of India, New Delhi, India [DBT-NER/Agri/16/2012]
- UGC-SAP
- DST FIST
- DBT Strengthening
- DBT Hub
- DBT-BIF
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Vermicomposting is a dependable waste recycling technology which greatly augments N and P levels mainly through microbial action. This paper aims to identify efficient N-fixing (NFB) and P-solubilizing (PSB) bacteria from earthworm intestines. Various combinations of vegetable market waste, rice straw, and cowdung were fed to two earthworm species (Eisenia fetida and Perionyx excavatus). Total organic C decreased, pH shifted towards neutrality, and NPK availability, and microbial (NFB, PSB, and total bacteria) population increased remarkably during vermicomposting with E. fetida. Therefore, 45 NFB and 34 PSB strains isolated from Eisenia gut were initially screened, their inter-dominance assessed, and 8 prolific strains were identified through 16SrRNA sequencing. Interestingly, two novel N-fixing strains of Kluyvera ascorbata emerged as an efficient biofertilizer candidate. Moreover, both N-fixing and P-solubilizing strains of Serratia and Bacillus were isolated from earthworm gut. All the isolated strains significantly improved soil health and facilitated crop growth as compared to commercial biofertilizers. (C) 2016 Elsevier Ltd. All rights reserved.
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