Abstract
Increasing water scarcity necessitates the development of irrigated rice systems that require less water than traditional flooded rice. Effects of different water regimes on grain yield, quality and water productivity in rice under nitrogen management were studied using a variety of Liangyoupeijiu in a field. Cultivar Liangyoupeijiu was grown under traditional flooding (TF), alternately wetting and drying irrigation (AWD) and raised-bed cultivation (RBC) at four N rates (0-270 kg N ha -1 in 90 kg increments, expressed as N 0 , N 90 , N 180 and N 270 , respectively). Three water regimes treatments were arranged in a split plot design with three replications. Water regimes were the main plots, and four nitrogen levels were used as subplots. There were significant differences in rice grain yield, quality and water productivity under different water regimes with various nitrogen rates. AWD and RBC increased grain yield by 2.5% and 9.1%, improved water productivity by 28.9% and 32.2%, respectively, compared with that under TF. Milling quality traits such as brown rice rate (BRR) were improved significantly under AWD and RBC. Significant interactions between irrigation regimes and N rates were also observed in panicle number per square metre, Chalky percentage (CP) and chalkiness values (CN) of grain. The grain yield under N 180 was increased by 45.4% under TF, 65.2% under AWD and 38.4% under RBC, respectively, compared with that under N 0 . The results suggest that AWD and RBC would be better practices than TF in some areas in China where water is scarce.
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Claims 11
Claim · model-written summary
AWD raised rice grain yield 2.5% versus traditional flooding.
- Taxon
- rice
Oryza sativae0 - Treatment
- AWDe1
- Outcome
- grain yielde1
- Direction
- increasede1
- Value
- 2.5%e1
- Comparator
- TFe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rice under nitrogen management”
e1“AWD and RBC increased grain yield by 2.5% and 9.1%, improved water productivity by 28.9% and 32.2%, respectively, compared with that under TF”
Claim · model-written summary
RBC raised rice grain yield 9.1% versus traditional flooding.
- Taxon
- riceOryza sativae0
- Treatment
- RBCe1
- Outcome
- grain yielde1
- Direction
- increasede1
- Value
- 9.1%e1
- Comparator
- TFe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rice under nitrogen management”
e1“AWD and RBC increased grain yield by 2.5% and 9.1%, improved water productivity by 28.9% and 32.2%, respectively, compared with that under TF”
Claim · model-written summary
AWD improved water productivity 28.9% versus traditional flooding.
- Taxon
- riceOryza sativae0
- Treatment
- AWDe1
- Outcome
- water productivitye1
- Direction
- improvede1
- Value
- 28.9%e1
- Comparator
- TFe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rice under nitrogen management”
e1“AWD and RBC increased grain yield by 2.5% and 9.1%, improved water productivity by 28.9% and 32.2%, respectively, compared with that under TF”
Claim · model-written summary
RBC improved water productivity 32.2% versus traditional flooding.
- Taxon
- riceOryza sativae0
- Treatment
- RBCe1
- Outcome
- water productivitye1
- Direction
- improvede1
- Value
- 32.2%e1
- Comparator
- TFe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rice under nitrogen management”
e1“AWD and RBC increased grain yield by 2.5% and 9.1%, improved water productivity by 28.9% and 32.2%, respectively, compared with that under TF”
Claim · model-written summary
AWD significantly improved brown rice rate.
- Taxon
- riceOryza sativae0
- Treatment
- AWDe1
- Outcome
- brown rice rate (BRR)e1
- Direction
- improvede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rice under nitrogen management”
e1“Milling quality traits such as brown rice rate (BRR) were improved significantly under AWD and RBC”
Claim · model-written summary
RBC significantly improved brown rice rate.
- Taxon
- riceOryza sativae0
- Treatment
- RBCe1
- Outcome
- brown rice rate (BRR)e1
- Direction
- improvede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rice under nitrogen management”
e1“Milling quality traits such as brown rice rate (BRR) were improved significantly under AWD and RBC”
Claim · model-written summary
Irrigation regime and nitrogen rate interacted significantly for panicle number, chalky percentage and chalkiness.
- Taxon
- riceOryza sativae0
- Treatment
- irrigation regimes and N ratese1
- Outcome
- panicle number per square metre, Chalky percentage (CP) and chalkiness values (CN) of graine1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rice under nitrogen management”
e1“Significant interactions between irrigation regimes and N rates were also observed in panicle number per square metre, Chalky percentage (CP) and chalkiness values (CN) of grain”
Claim · model-written summary
N 180 raised grain yield 45.4% versus N 0 under TF.
- Taxon
- riceOryza sativae0
- Treatment
- N 180e1
- Outcome
- grain yielde1
- Direction
- increasede1
- Value
- 45.4%e1
- Qualifier
- under TFe1
- Comparator
- N 0e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rice under nitrogen management”
e1“The grain yield under N 180 was increased by 45.4% under TF, 65.2% under AWD and 38.4% under RBC, respectively, compared with that under N 0”
Claim · model-written summary
N 180 raised grain yield 65.2% versus N 0 under AWD.
- Taxon
- riceOryza sativae0
- Treatment
- N 180e1
- Outcome
- grain yielde1
- Direction
- increasede1
- Value
- 65.2%e1
- Qualifier
- under AWDe1
- Comparator
- N 0e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rice under nitrogen management”
e1“The grain yield under N 180 was increased by 45.4% under TF, 65.2% under AWD and 38.4% under RBC, respectively, compared with that under N 0”
Claim · model-written summary
N 180 raised grain yield 38.4% versus N 0 under RBC.
- Taxon
- riceOryza sativae0
- Treatment
- N 180e1
- Outcome
- grain yielde1
- Direction
- increasede1
- Value
- 38.4%e1
- Qualifier
- under RBCe1
- Comparator
- N 0e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rice under nitrogen management”
e1“The grain yield under N 180 was increased by 45.4% under TF, 65.2% under AWD and 38.4% under RBC, respectively, compared with that under N 0”
Claim · model-written summary
The authors recommend AWD and RBC over TF where water is scarce in China.
- Taxon
- riceOryza sativae0
- Outcome
- better practices than TFe1
- Qualifier
- where water is scarcee1
- Setting
- Chinae1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rice under nitrogen management”
e1“AWD and RBC would be better practices than TF in some areas in China where water is scarce”
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See all 729 papers →8 of 9 groups shown: named compounds and organisms first, then groups whose results differ (checked claim by claim), then those with positive and negative results, then the smaller groups.
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.