Abstract
Experiments were carried out in the laboratory and greenhouse to determine the growth inhibitory effects of Grassohopper's cyperus (Cyperus iria L.) on the seedlings of 5 Malaysian rice varieties namely MR211, MRQ74, MR220, MR84 and MR232. Three concentrations of the aqueous extract of the weed (12.5, 25.0 and 50.0 g/l) and weed debris (5, 10 and 20 g dry debris/1000 g soil) were used to test the allelopathic effect of C. iria on the growth of the rice plants. The weed leaf, stem and root extracts reduced the growth of the rice seedlings and showed selective activity in the varieties. The C. iria leaf and stem extracts showed comparatively higher growth inhibitory effects than those from the root. The weed extract caused more reduction in the root length of the rice plant compared to the shoot length. Among the rice varieties tested, MR232 was found to be more susceptible to the weed inhibitory effect. The leaf extract of C. iria at full strength caused root and shoot reduction of MR232 by 88.1% and 73.1% respectively (compared to the control). In most cases the fresh weight of the rice seedlings were more affected than the plant height. Weed debris caused significant reduction of leaf chlorophyll content in all the rice varieties tested with the exception of MR211. The chlorophyll content of MR232 was greatly affected by the weed debris which caused reduction of 36.4% compared to the control. The inhibitory effects of weed extracts and debris on rice growth parameters were found to be concentration dependent.
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Claims 10
Claim · model-written summary
Cyperus leaf, stem and root extracts reduced rice seedling growth with variety-specific effects.
- Taxon
- rice
Oryza sativae0 - Treatment
- weed leaf, stem and root extractse0
- Interactor
- C. iria
.jpg?width=60)
Cyperus iriae1weed - Outcome
- growth of the rice seedlingse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“The weed leaf, stem and root extracts reduced the growth of the rice seedlings and showed selective activity in the varieties.”
e1“C. iria on the growth of the rice plants.”
Claim · model-written summary
Cyperus leaf and stem extracts inhibited rice growth more than root extracts.
- Taxon
- riceOryza sativae1
- Treatment
- C. iria leaf and stem extractse0
- Interactor
- C. iriaCyperus iriae0weed
- Outcome
- growth inhibitory effectse0
- Direction
- highere0
- Comparator
- roote0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The C. iria leaf and stem extracts showed comparatively higher growth inhibitory effects than those from the root.”
e1“5 Malaysian rice varieties”
Claim · model-written summary
Weed extract reduced rice root length more than shoot length.
- Taxon
- riceOryza sativae0
- Treatment
- weed extracte0
- Interactor
- C. iriaCyperus iriae1weed
- Outcome
- root lengthe0
- Direction
- reductione0
- Comparator
- shoot lengthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The weed extract caused more reduction in the root length of the rice plant compared to the shoot length.”
e1“C. iria on the growth of the rice plants.”
Claim · model-written summary
MR232 was the most susceptible tested rice variety.
- Taxon
- riceOryza sativae0
- Material
- MR232e0
- Interactor
- C. iriaCyperus iriae1weed
- Outcome
- susceptible to the weed inhibitory effecte0
- Direction
- more susceptiblee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Among the rice varieties tested, MR232 was found to be more susceptible to the weed inhibitory effect.”
e1“C. iria on the growth of the rice plants.”
Claim · model-written summary
Full-strength Cyperus leaf extract reduced MR232 root length by 88.1% versus control.
- Taxon
- riceOryza sativae1
- Material
- MR232e0
- Treatment
- leaf extract of C. iria at full strengthe0
- Interactor
- C. iriaCyperus iriae0weed
- Outcome
- roote0
- Direction
- reductione0
- Value
- 88.1%e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The leaf extract of C. iria at full strength caused root and shoot reduction of MR232 by 88.1% and 73.1% respectively (compared to the control).”
e1“5 Malaysian rice varieties”
Claim · model-written summary
Full-strength Cyperus leaf extract reduced MR232 shoot length by 73.1% versus control.
- Taxon
- riceOryza sativae1
- Material
- MR232e0
- Treatment
- leaf extract of C. iria at full strengthe0
- Interactor
- C. iriaCyperus iriae0weed
- Outcome
- shoote0
- Direction
- reductione0
- Value
- 73.1%e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The leaf extract of C. iria at full strength caused root and shoot reduction of MR232 by 88.1% and 73.1% respectively (compared to the control).”
e1“5 Malaysian rice varieties”
Claim · model-written summary
Fresh weight of rice seedlings was more affected than height in most cases.
- Taxon
- riceOryza sativae0
- Outcome
- fresh weighte0
- Direction
- more affectede0
- Comparator
- plant heighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In most cases the fresh weight of the rice seedlings were more affected than the plant height.”
Claim · model-written summary
Weed debris significantly reduced leaf chlorophyll in all tested rice varieties except MR211.
- Taxon
- riceOryza sativae0
- Material
- MR211e0
- Treatment
- Weed debrise0
- Interactor
- C. iriaCyperus iriae1weed
- Outcome
- leaf chlorophyll contente0
- Direction
- reductione0
- Qualifier
- with the exception of MR211e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Weed debris caused significant reduction of leaf chlorophyll content in all the rice varieties tested with the exception of MR211.”
e1“C. iria on the growth of the rice plants.”
Claim · model-written summary
Weed debris reduced MR232 chlorophyll by 36.4% relative to control.
- Taxon
- riceOryza sativae1
- Material
- MR232e0
- Treatment
- weed debrise0
- Interactor
- C. iriaCyperus iriae2weed
- Outcome
- chlorophyll contente0
- Direction
- reductione0
- Value
- 36.4%e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The chlorophyll content of MR232 was greatly affected by the weed debris which caused reduction of 36.4% compared to the control.”
e1“5 Malaysian rice varieties”
e2“C. iria on the growth of the rice plants.”
Claim · model-written summary
Inhibition by Cyperus extracts and debris increased with concentration.
- Taxon
- riceOryza sativae0
- Treatment
- weed extracts and debrise0
- Interactor
- C. iriaCyperus iriae1weed
- Outcome
- rice growth parameterse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The inhibitory effects of weed extracts and debris on rice growth parameters were found to be concentration dependent.”
e1“C. iria on the growth of the rice plants.”
The same questions in other papers
Cyperus iria · growth · Oryza sativa (rice)Results agree
1 paper in the same direction as this paper
- no effect
botanical · growth · Oryza sativa (rice)Positive and negative results
77 papers in the same direction as this paper · 133 in the opposite direction
- negative
- positive
- positive
207 papers more in this group
See all 211 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.