Abstract
MANAGEMENT of post-harvest residues, produced during the green-cane harvesting of sugarcane in Louisiana, has become an increasingly important issue for producers, particularly in areas where burning of the residues is banned or restricted. If the residues, which range from 48 tonnes per hectare, are not removed prior to the emergence of the subsequent ratoon crop in the spring, yields may be reduced from 4.5 to 13.5 tonnes per hectare. A study was initiated to determine if native bacteria and fungi that were capable of degrading post-harvest residues could be identified and used to accelerate residue decomposition. Soil was collected from five locations, and nine bacteria and seven fungi capable of degrading cellulose were isolated. These isolates were evaluated using wet fermentation techniques, and two bacterial and two fungal isolates capable of degrading from 3252% of available cellulose were selected for further study. In dry fermentation and in non-sterile greenhouse studies, the most efficient degradation of residue (1925%) occurred when the isolates were combined into a consortium. Experiments also showed that the consortium degraded dry sugarcane leaves significantly greater (22%) than green leaves (14%), and sterilising the residues prior to incubation did not affect decomposition. When the carbon to nitrogen ratio of the residue was varied from 10:1 to 50:1, the total residue degraded decreased from 28 to 19%. Finally, results from a field study showed that populations of these isolates steadily increased after soil inoculation indicating their successful establishment in the field. Although total residue levels were not significantly affected, soil organic carbon significantly increased where the consortium was applied compared to the control, suggesting that decomposition is being accelerated by the addition of the microbes.
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Claims 10
Claim · model-written summary
Unremoved sugarcane residues may reduce ratoon yield by 4.5 to 13.5 tonnes per hectare.
Verbatim
e0“yields may be reduced from 4.5 to 13.5 tonnes per hectare”
e1“green-cane harvesting of sugarcane in Louisiana”
Claim · model-written summary
Nine bacteria and seven fungi able to degrade cellulose were isolated.
Verbatim
e0“nine bacteria and seven fungi capable of degrading cellulose were isolated”
e1“green-cane harvesting of sugarcane in Louisiana”
Claim · model-written summary
Selected isolates degraded 32 to 52% of available cellulose.
Verbatim
e0“two bacterial and two fungal isolates capable of degrading from 3252% of available cellulose were selected for further study”
e1“green-cane harvesting of sugarcane in Louisiana”
Claim · model-written summary
Combining isolates in a consortium gave maximum residue degradation of 19 to 25%.
- Taxon
- sugarcanee1
- Treatment
- isolates were combined into a consortiume0
- Outcome
- degradation of residuee0
- Direction
- most efficiente0
- Value
- 1925%e0
Not reportedComparator
Verbatim
e0“most efficient degradation of residue (1925%) occurred when the isolates were combined into a consortium”
e1“green-cane harvesting of sugarcane in Louisiana”
Claim · model-written summary
The consortium degraded dry leaves more than green leaves, 22% versus 14%.
Verbatim
e0“consortium degraded dry sugarcane leaves significantly greater (22%) than green leaves (14%)”
Claim · model-written summary
Sterilizing residue did not affect decomposition.
- Taxon
- sugarcanee1
- Treatment
- sterilising the residues prior to incubatione0
- Outcome
- decompositione0
- Direction
- did not affecte0
Not reportedComparator
Verbatim
e0“sterilising the residues prior to incubation did not affect decomposition”
e1“green-cane harvesting of sugarcane in Louisiana”
Claim · model-written summary
Raising carbon to nitrogen ratio from 10:1 to 50:1 lowered residue degradation from 28 to 19%.
- Taxon
- sugarcanee1
- Treatment
- carbon to nitrogen ratio of the residue was varied from 10:1 to 50:1e0
- Outcome
- total residue degradede0
- Direction
- decreasede0
- Value
- 28 to 19%e0
Not reportedComparator
Verbatim
e0“carbon to nitrogen ratio of the residue was varied from 10:1 to 50:1, the total residue degraded decreased from 28 to 19%”
e1“green-cane harvesting of sugarcane in Louisiana”
Claim · model-written summary
Inoculated isolate populations steadily increased in the field.
- Taxon
- sugarcanee1
- Treatment
- soil inoculatione0
- Outcome
- populations of these isolatese0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“populations of these isolates steadily increased after soil inoculation”
e1“green-cane harvesting of sugarcane in Louisiana”
Claim · model-written summary
Consortium application did not significantly change total residue levels.
Verbatim
e0“total residue levels were not significantly affected, soil organic carbon significantly increased where the consortium was applied compared to the control”
e1“green-cane harvesting of sugarcane in Louisiana”
Claim · model-written summary
Consortium application significantly increased soil organic carbon relative to control.
Verbatim
e0“soil organic carbon significantly increased where the consortium was applied compared to the control”
e1“green-cane harvesting of sugarcane in Louisiana”
The same questions in other papers
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6 papers in the same direction as this paper · 3 in the opposite direction
- no effect
- negative
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See all 10 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.