Abstract
Vermicomposts prepared from rice straw, Eichhornia crassipes, Ipomoea carnea, and their mixed biomass, were enriched with microbial inoculants and evaluated for their effect on growth and yield of rice, and nutrient availability and microbial population in soil. Irrespective of the vermicompost sources, significant increases in nitrogen (N) content and microbial population in vermicomposts were recorded after eight weeks of incubation with inoculation of Azotobacter chroococcum, Azospirillum brasilense, and Pseudomonas fluorescens, either alone or in consortia, and the highest increase was observed with A. chroococcum followed by A. brasilense. Among different vermicomposts, Ipomoea vermicompost was found superior in N content and microbial population. Vermicompost enriched with A. chroococcum resulted in the highest improvement in plant growth, grain yield, leaf chlorophyll content and nitrate reductase activity of rice, followed by enrichment with A. brasilense. Nutrient content in plant and organic C, available N, P, K, and CEC in post-harvest soil were also significantly improved by the application of enriched vermicomposts, with the best result obtained with Azotobacter-enriched vermicompost. Overall, the results suggest that the locally available plant biomasses, particularly Ipomoea carnea, a weed abundantly available in northeast India, can be easily converted into an environment-friendly nutrient source by vermicomposting, using plant-growth-promoting microorganisms such as A. chroococcum and A. brasilense.
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Claims 6
Claim · model-written summary
Vermicompost enriched with Azotobacter chroococcum gave the highest improvement in plant growth and grain yield of rice, higher than enrichment with Azospirillum brasilense.
- Taxon
- rice
Oryza sativae0 - Treatment
- Vermicompost enriched with A. chroococcume1
- Interactor
- A. chroococcumAzotobacter chroococcume1symbiont
- Second interactor
- A. brasilense
Azospirillum brasilensee1symbiont - Outcome
- plant growth, grain yielde1
- Direction
- highest improvemente1
- Comparator
- enrichment with A. brasilensee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“evaluated for their effect on growth and yield of rice”
e1“Vermicompost enriched with A. chroococcum resulted in the highest improvement in plant growth, grain yield, leaf chlorophyll content and nitrate reductase activity of rice, followed by enrichment with A. brasilense”
Claim · model-written summary
Vermicompost enriched with Azotobacter chroococcum gave the highest improvement in leaf chlorophyll content and nitrate reductase activity of rice.
- Taxon
- riceOryza sativae0
- Treatment
- Vermicompost enriched with A. chroococcume1
- Interactor
- A. chroococcumAzotobacter chroococcume1symbiont
- Second interactor
- A. brasilenseAzospirillum brasilensee1symbiont
- Outcome
- leaf chlorophyll content and nitrate reductase activitye1
- Direction
- highest improvemente1
- Comparator
- enrichment with A. brasilensee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“evaluated for their effect on growth and yield of rice”
e1“Vermicompost enriched with A. chroococcum resulted in the highest improvement in plant growth, grain yield, leaf chlorophyll content and nitrate reductase activity of rice, followed by enrichment with A. brasilense”
Claim · model-written summary
Enriched vermicompost significantly improved nutrient content in rice plants, with the best result from Azotobacter-enriched vermicompost.
- Taxon
- riceOryza sativae0
- Treatment
- application of enriched vermicompostse2
- Outcome
- Nutrient content in plante2
- Direction
- significantly improvede2
- Qualifier
- best result obtained with Azotobacter-enriched vermicomposte2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“evaluated for their effect on growth and yield of rice”
e2“Nutrient content in plant and organic C, available N, P, K, and CEC in post-harvest soil were also significantly improved by the application of enriched vermicomposts, with the best result obtained with Azotobacter-enriched vermicompost”
Claim · model-written summary
Enriched vermicompost significantly improved organic C, available N, P, K and CEC in post-harvest soil, with the best result from Azotobacter-enriched vermicompost.
- Taxon
- riceOryza sativae0
- Treatment
- application of enriched vermicompostse2
- Outcome
- organic C, available N, P, K, and CEC in post-harvest soile2
- Direction
- significantly improvede2
- Qualifier
- best result obtained with Azotobacter-enriched vermicomposte2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“evaluated for their effect on growth and yield of rice”
e2“Nutrient content in plant and organic C, available N, P, K, and CEC in post-harvest soil were also significantly improved by the application of enriched vermicomposts, with the best result obtained with Azotobacter-enriched vermicompost”
Claim · model-written summary
Ipomoea vermicompost was superior in N content and microbial population to the other vermicomposts.
- Taxon
- riceOryza sativae0
- Treatment
- Ipomoea vermicomposte3
- Outcome
- N content and microbial populatione3
- Direction
- superiore3
- Comparator
- different vermicompostse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“evaluated for their effect on growth and yield of rice”
e3“Among different vermicomposts, Ipomoea vermicompost was found superior in N content and microbial population”
Claim · model-written summary
Inoculation of vermicompost with Azotobacter chroococcum significantly increased N content and microbial population in vermicompost.
- Taxon
- riceOryza sativae0
- Treatment
- inoculation of Azotobacter chroococcume4
- Interactor
- Azotobacter chroococcumAzotobacter chroococcume4symbiont
- Second interactor
- Azospirillum brasilenseAzospirillum brasilensee4symbiont
- Outcome
- nitrogen (N) content and microbial population in vermicompostse4
- Direction
- increasese4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“evaluated for their effect on growth and yield of rice”
e4“significant increases in nitrogen (N) content and microbial population in vermicomposts were recorded after eight weeks of incubation with inoculation of Azotobacter chroococcum, Azospirillum brasilense, and Pseudomonas fluorescens”
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