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Enriching vermicompost by nitrogen fixing and phosphate solubilizing bacteria
1Department of Microbiology, CCS Haryana Agricultural University, Hisar 125004, India.
Bioresource Technology
|February 7, 2001
Summary
Adding nitrogen-fixing bacteria and phosphate-solubilizing bacteria to vermicompost significantly boosted nitrogen and phosphorus content. This bio-enrichment enhances nutrient availability in organic fertilizers.
Area of Science:
- Agricultural Microbiology
- Soil Science
- Biotechnology
Background:
- Vermicompost is a valuable organic fertilizer, but its nutrient content can be further enhanced.
- Microbial inoculation offers a sustainable approach to improve fertilizer quality.
Purpose of the Study:
- To assess the impact of specific bacterial inoculants on the nitrogen (N) and phosphorus (P) content of vermicompost.
- To evaluate the combined effect of microbial inoculation and rock phosphate enrichment.
Main Methods:
- Vermicompost was inoculated with nitrogen-fixing bacteria (Azotobacter chroococcum, Azospirillum lipoferum) and phosphate-solubilizing bacteria (Pseudomonas striata).
- Some treatments included enrichment with rock phosphate.
- Bacterial proliferation, N fixation, and P solubilization were monitored during incubation.
Main Results:
- Inoculation with nitrogen-fixing bacteria significantly increased N and P content in vermicompost.
- Enrichment with rock phosphate, combined with Pseudomonas striata inoculation, markedly improved available P.
- Inoculated bacterial strains showed rapid proliferation, effective N fixation, and solubilization of native and added P.
Conclusions:
- Microbial inoculation is an effective strategy to enhance the nutritional value of vermicompost.
- Combining specific bacterial strains with phosphate rock can optimize phosphorus availability in organic fertilizers.
- This bio-enrichment approach holds potential for sustainable agriculture and improved soil fertility.