Abstract
Abstract Chemical N fertilizers are usually applied to modern rice ( Oryza sativa L.) cultivars, but yield responses are obtained from green manuring as well. To be considered as a viable alternative to chemical N fertilizer in tropical Asia, however, green manures must tolerate the ephemeral waterlogging that precedes rice cultivation. Experiments on an Aeric Tropaqualf soil during three early wet seasons determined green manure N accumulation in 60 d or less, and rice grain yield response to it. In the first experiment (1983), cowpea [ Vigna unguiculata (L.) Walp.] and Sesbania cannabina [(Retz.) Poir.] were grown 24, 36, and 48 d before incorporation. Nitrogen accumulation was greatest (79 kg N ha −1 ) in 48‐d S. cannabina . Accumulation in cowpea was apparently depressed by waterlogging. Rice grain yield response to green manure N was unaffected by location of green manure cultivation ( in situ vs. transported from a nearby field). In the second (1984) and third (1985) experiments, Sesbania sp. were flooded during the last 25 d of growth to assure early wet–season waterlogging. Mean N accumulation in flooded S. rostrata (Brem. and Obrem.), which nodulates on its stem, was 90 kg ha −1 in 48 d and 164 kg ha −1 in 60 d. Nitrogen accumulations in nonflooded S. rostrata were 128 kg ha −1 in 48 d and 198 kg ha −1 in 60 d. Accumulation in a Nepalese S. cannabina cultivar averaged 84% of that in S. rostrutu. Rice grain yield response was a function of green manure N regardless of species or age. Both S. rostrata and S. cannabina tolerate waterlogging and accumulate sufficient N in less than 60 d to increase rice yields more than 2 Mg ha −1 .
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Claims 12
Claim · model-written summary
N accumulation was greatest (79 kg N ha-1) in 48-d S. cannabina in the first experiment.
- Taxon
- S. cannabina
Sesbania cannabinae0 - Outcome
- Nitrogen accumulatione0
- Direction
- greateste0
- Value
- 79 kg N ha −1e0
- Qualifier
- 48‐de0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen accumulation was greatest (79 kg N ha −1 ) in 48‐d S. cannabina”
Claim · model-written summary
N accumulation in cowpea was apparently depressed by waterlogging.
- Taxon
- cowpea
Vigna unguiculatae0 - Treatment
- waterlogginge0
- Outcome
- Accumulatione0
- Direction
- depressede0
- Qualifier
- apparentlye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Accumulation in cowpea was apparently depressed by waterlogging”
Claim · model-written summary
Rice grain yield response to green manure N was unaffected by whether the green manure was grown in situ or transported from a nearby field.
- Taxon
- Rice
Oryza sativae0 - Treatment
- location of green manure cultivatione0
- Outcome
- Rice grain yield response to green manure Ne0
- Direction
- unaffectede0
- Comparator
- transported from a nearby fielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice grain yield response to green manure N was unaffected by location of green manure cultivation ( in situ vs. transported from a nearby field)”
Claim · model-written summary
Mean N accumulation in flooded S. rostrata was 90 kg ha-1 in 48 d.
- Taxon
- S. rostrataSesbania rostratae0
- Outcome
- N accumulatione0
- Value
- 90 kg ha −1e0
- Qualifier
- floodede0
Verbatim
e0“Mean N accumulation in flooded S. rostrata (Brem. and Obrem.), which nodulates on its stem, was 90 kg ha −1 in 48 d”
Claim · model-written summary
Mean N accumulation in flooded S. rostrata was 164 kg ha-1 in 60 d.
- Taxon
- S. rostrataSesbania rostratae0
- Outcome
- N accumulatione0
- Value
- 164 kg ha −1e0
- Qualifier
- in 60 de0
Verbatim
e0“Mean N accumulation in flooded S. rostrata (Brem. and Obrem.), which nodulates on its stem, was 90 kg ha −1 in 48 d and 164 kg ha −1 in 60 d”
Claim · model-written summary
N accumulation in nonflooded S. rostrata was 128 kg ha-1 in 48 d.
- Taxon
- S. rostrataSesbania rostratae0
- Outcome
- Nitrogen accumulationse0
- Value
- 128 kg ha −1e0
- Qualifier
- nonfloodede0
Verbatim
e0“Nitrogen accumulations in nonflooded S. rostrata were 128 kg ha −1 in 48 d”
Claim · model-written summary
N accumulation in nonflooded S. rostrata was 198 kg ha-1 in 60 d.
- Taxon
- S. rostrataSesbania rostratae0
- Outcome
- Nitrogen accumulationse0
- Value
- 198 kg ha −1e0
- Qualifier
- in 60 de0
Verbatim
e0“Nitrogen accumulations in nonflooded S. rostrata were 128 kg ha −1 in 48 d and 198 kg ha −1 in 60 d”
Claim · model-written summary
N accumulation in a Nepalese S. cannabina cultivar averaged 84% of that in S. rostrata.
- Taxon
- S. cannabinaSesbania cannabinae0
- Material
- Nepalese S. cannabina cultivare0
- Outcome
- Accumulatione0
- Value
- 84%e0
- Comparator
- S. rostrutue0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Accumulation in a Nepalese S. cannabina cultivar averaged 84% of that in S. rostrutu”
Claim · model-written summary
Rice grain yield response was a function of green manure N regardless of species or age.
- Taxon
- RiceOryza sativae0
- Treatment
- green manure Ne0
- Outcome
- grain yield responsee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice grain yield response was a function of green manure N regardless of species or age”
Claim · model-written summary
S. rostrata tolerates waterlogging.
- Taxon
- S. rostrataSesbania rostratae0
- Outcome
- tolerate waterlogginge0
Not reportedDirection
Verbatim
e0“Both S. rostrata and S. cannabina tolerate waterlogging and accumulate sufficient N in less than 60 d to increase rice yields more than 2 Mg ha −1”
Claim · model-written summary
S. cannabina tolerates waterlogging.
- Taxon
- S. cannabinaSesbania cannabinae0
- Outcome
- tolerate waterlogginge0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both S. rostrata and S. cannabina tolerate waterlogging and accumulate sufficient N in less than 60 d to increase rice yields more than 2 Mg ha −1”
Claim · model-written summary
S. rostrata and S. cannabina accumulate sufficient N in less than 60 d to increase rice yields by more than 2 Mg ha-1.
- Taxon
- riceOryza sativae0
- Treatment
- S. rostrata and S. cannabinae0
- Outcome
- rice yieldse0
- Direction
- increasee0
- Value
- more than 2 Mg ha −1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both S. rostrata and S. cannabina tolerate waterlogging and accumulate sufficient N in less than 60 d to increase rice yields more than 2 Mg ha −1”
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See all 3,455 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.