Abstract
With green sugarcane (interspecific hybrids of Saccharum spp.) harvesting, 6 to 24 Mg ha −1 of postharvest residue is deposited on the field surface covering the sugarcane stubble that must reemerge for several ratoon crops. The objectives of this research were to: (i) determine if postharvest residue possesses allelopathic, autotoxic, and hormetic properties; (ii) determine the interaction of soil type with possible autotoxic effects; and (iii) identify a reliable indicator species. Extract concentrations consisted of 0, 0.1, 10, 25, and 100% of the original solution of a 1:28 tissue to water extract. The higher concentrations of residue extracts exhibited autotoxicity by delaying early leaf development. The lower extract concentration of 10% increased sugarcane bud germination by 45% compared with the control, indicating hormetic effects. Allelopathic activity on tall morninglory ( Ipomoea hederacea Jacq.) was more pronounced on a light soil; germination and radical length were reduced by all concentrations by an average of 42% and 8 mm, respectively, compared with the control. Seedling dry weights were reduced by an average of 10 mg by the 10, 25, and 100% extract concentrations relative to the control. On the heavy soil, only the 100% concentration reduced radical length and weight by 5 mm and 4 mg, respectively, relative to the control. Extract effects on oat ( Avena nuda L.), rye ( Secale cereale L.), and tomato ( Lycopersicon esculentum Mill.) showed poor correlation with effects on sugarcane. Chemical analysis by gas chromatography/mass spectrotometry indicated the extract contained benzoic acid. Further studies are needed to establish the impact of benzoic acid in natural settings.
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Claims 11
Claim · model-written summary
Higher residue extract concentrations delayed sugarcane leaf development.
- Taxon
- Sugarcanet0
- Treatment
- higher concentrations of residue extractse0
- Outcome
- early leaf developmente0
- Direction
- delayinge0
Not reportedComparator
Verbatim
e0“The higher concentrations of residue extracts exhibited autotoxicity by delaying early leaf development”
t0“Postharvest Sugarcane Residue”
Claim · model-written summary
10% extract increased sugarcane bud germination by 45%.
Verbatim
e0“The lower extract concentration of 10% increased sugarcane bud germination by 45% compared with the control”
Claim · model-written summary
Residue extracts reduced morninglory germination 42% on light soil.
Verbatim
e0“Allelopathic activity on tall morninglory ( Ipomoea hederacea Jacq.) was more pronounced on a light soil; germination and radical length were reduced by all concentrations by an average of 42% and 8 mm, respectively, compared with the control”
Claim · model-written summary
Residue extracts reduced morninglory radical length 8 mm on light soil.
Verbatim
e0“Allelopathic activity on tall morninglory ( Ipomoea hederacea Jacq.) was more pronounced on a light soil; germination and radical length were reduced by all concentrations by an average of 42% and 8 mm, respectively, compared with the control”
Claim · model-written summary
10, 25 and 100% extracts reduced seedling dry weight 10 mg.
Verbatim
e0“Seedling dry weights were reduced by an average of 10 mg by the 10, 25, and 100% extract concentrations relative to the control”
e1“tall morninglory ( Ipomoea hederacea Jacq.)”
Claim · model-written summary
On heavy soil, 100% extract reduced radical length by 5 mm.
Verbatim
e0“On the heavy soil, only the 100% concentration reduced radical length and weight by 5 mm and 4 mg, respectively, relative to the control”
e1“tall morninglory ( Ipomoea hederacea Jacq.)”
Claim · model-written summary
On heavy soil, 100% extract reduced radical weight by 4 mg.
Verbatim
e0“On the heavy soil, only the 100% concentration reduced radical length and weight by 5 mm and 4 mg, respectively, relative to the control”
e1“tall morninglory ( Ipomoea hederacea Jacq.)”
Claim · model-written summary
Oat extract effects correlated poorly with sugarcane effects.
- Taxon
- oat
Avena sativae0 - Outcome
- poor correlatione0
- Comparator
- sugarcanee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Extract effects on oat ( Avena nuda L.), rye ( Secale cereale L.), and tomato ( Lycopersicon esculentum Mill.) showed poor correlation with effects on sugarcane”
Claim · model-written summary
Rye extract effects correlated poorly with sugarcane effects.
- Taxon
- rye
Secale cerealee0 - Outcome
- poor correlatione0
- Comparator
- sugarcanee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Extract effects on oat ( Avena nuda L.), rye ( Secale cereale L.), and tomato ( Lycopersicon esculentum Mill.) showed poor correlation with effects on sugarcane”
Claim · model-written summary
Tomato extract effects correlated poorly with sugarcane effects.
- Taxon
- tomato
Solanum lycopersicume0 - Outcome
- poor correlatione0
- Comparator
- sugarcanee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Extract effects on oat ( Avena nuda L.), rye ( Secale cereale L.), and tomato ( Lycopersicon esculentum Mill.) showed poor correlation with effects on sugarcane”
Claim · model-written summary
Residue extract contained benzoic acid.
Verbatim
e0“Chemical analysis by gas chromatography/mass spectrotometry indicated the extract contained benzoic acid”
t0“Postharvest Sugarcane Residue”
The same questions in other papers
botanical · growth · Saccharum officinarum (sugarcane)Positive and negative results
4 papers in the same direction as this paper · 1 in the opposite direction
- positive
- no effect
- positive
2 papers more in this group
See all 6 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.