Abstract
Importance of the work: Brown leaf spot disease is one of the major causes of yield losses in rice production in Cameroon.Objectives: To evaluate the bioactivity of aqueous extracts of three Cameroonian medicinal plants on rice growth, yield and brown spot disease incidence.Materials & Methods: Plant extracts were tested at two doses (1 kg/15 L and 2 kg/15 L sprayed), while water and Mancozeb were used as negative and positive controls, respectively, in a split plot design made up of two factors (variety and plant extract).The varieties were NERICA 8, NERICA L56, Long grain red rice and Toukbem.Results: NERICAs 8 and L56 (exotic) and, Toukbem (local) varieties had the highest number of leaves and tillers while Toukbem had the highest plants and leaf area at 9 wk after transplanting.The numbers of leaves (31.3) and tillers (9.7) were significantly (p < 0.05) higher in plants treated with Euphorbia hirta extract at 67 g/L compared to Artemesia annua and Commelina benghalensis extracts.Brown spot severity was lower with E. hirta at 134 g/L (30%) and not significantly different to Mancozeb (23.6%).The NERICA L56 × E. hirta interaction at 134 g/L had the highest yield (5.8 t/ha) compared to the NERICA L56 × Mancozeb (6.1 t/ha) interaction.Chemical analysis of the E. hirta aqueous extract showed the presence of known bioactive compounds.Main finding: Field application of aqueous extract of E. hirta at 134 g/L could be used as a bioagent for rice brown spot management.The formulation of a natural product with this extract is necessary for large-scale field applications.
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Claims 9
Claim · model-written summary
NERICA 8, NERICA L56 and Toukbem had the highest leaf and tiller counts.
- Taxon
- rice
Oryza sativat0 - Material
- Toukbeme0
- Outcome
- number of leaves and tillerse0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice growth”
e0“NERICAs 8 and L56 (exotic) and, Toukbem (local) varieties had the highest number of leaves and tillers”
Claim · model-written summary
Toukbem had the greatest plant height and leaf area at nine weeks after transplanting.
- Taxon
- riceOryza sativat0
- Material
- Toukbeme0
- Outcome
- plants and leaf areae0
- Direction
- higheste0
- Qualifier
- 9 wk after transplantinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice growth”
e0“Toukbem had the highest plants and leaf area at 9 wk after transplanting”
Claim · model-written summary
Euphorbia hirta extract at 67 g/L increased rice leaf number versus the other extracts.
- Taxon
- riceOryza sativat0
- Treatment
- Euphorbia hirta extract at 67 g/Le0
- Outcome
- numbers of leavese0
- Direction
- highere0
- Value
- 31.3e0
- Comparator
- Artemesia annua and Commelina benghalensis extractse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice growth”
e0“The numbers of leaves (31.3) and tillers (9.7) were significantly (p < 0.05) higher in plants treated with Euphorbia hirta extract at 67 g/L compared to Artemesia annua and Commelina benghalensis extracts.”
Claim · model-written summary
Euphorbia hirta extract at 67 g/L increased rice tiller number versus the other extracts.
- Taxon
- riceOryza sativat0
- Treatment
- Euphorbia hirta extract at 67 g/Le0
- Outcome
- tillerse0
- Direction
- highere0
- Value
- 9.7e0
- Comparator
- Artemesia annua and Commelina benghalensis extractse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice growth”
e0“The numbers of leaves (31.3) and tillers (9.7) were significantly (p < 0.05) higher in plants treated with Euphorbia hirta extract at 67 g/L compared to Artemesia annua and Commelina benghalensis extracts.”
Claim · model-written summary
Brown spot severity was 30% with E. hirta at 134 g/L, without a significant difference from Mancozeb at 23.6%.
- Taxon
- riceOryza sativat0
- Treatment
- E. hirta at 134 g/Le0
- Outcome
- Brown spot severitye0
- Direction
- lowere0
- Value
- 30%e0
- Qualifier
- 23.6%e0
- Comparator
- Mancozebe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice growth”
e0“Brown spot severity was lower with E. hirta at 134 g/L (30%) and not significantly different to Mancozeb (23.6%).”
Claim · model-written summary
The NERICA L56 by E. hirta treatment yielded 5.8 t/ha versus 6.1 t/ha under Mancozeb.
- Taxon
- riceOryza sativat0
- Material
- NERICA L56e0
- Treatment
- E. hirta interaction at 134 g/Le0
- Outcome
- yielde0
- Direction
- higheste0
- Value
- 5.8 t/hae0
- Qualifier
- 6.1 t/hae0
- Comparator
- Mancozebe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice growth”
e0“The NERICA L56 × E. hirta interaction at 134 g/L had the highest yield (5.8 t/ha) compared to the NERICA L56 × Mancozeb (6.1 t/ha) interaction.”
Claim · model-written summary
Chemical analysis found known bioactive compounds in the E. hirta aqueous extract.
- Taxon
- Euphorbia hirta
_I.jpg?width=60)
Euphorbia hirtat0 - Outcome
- presence of known bioactive compoundse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_I.jpg?width=500)
Verbatim
t0“Euphorbia hirta”
e0“Chemical analysis of the E. hirta aqueous extract showed the presence of known bioactive compounds.”
Claim · model-written summary
The authors recommend E. hirta extract at 134 g/L for rice brown spot management.
- Taxon
- riceOryza sativat0
- Outcome
- Field application of aqueous extract of E. hirta at 134 g/Le0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice growth”
e0“Field application of aqueous extract of E. hirta at 134 g/L could be used as a bioagent for rice brown spot management.”
Claim · model-written summary
The authors call for formulation of a natural product for large scale field application.
- Taxon
- riceOryza sativat0
- Outcome
- formulation of a natural product with this extracte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice growth”
e0“The formulation of a natural product with this extract is necessary for large-scale field applications.”
The same questions in other papers
botanical · yield · Oryza sativa (rice)Results differ
192 papers in the same direction as this paper · 11 in the opposite direction · 4 reporting no difference from an alternative
- positive
- negative
- no effect
204 papers more in this group
See all 208 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.