Abstract
AbstractWe measured fine-root production at Acacia mangium (AM), Swietenia macrophylla (SM), and Araucaria cunninghamii (AC) sites in response to nitrogen (N) and phosphorus (P) application using the root-ingrowth core method for a period of 5 months in Sabah, Malaysia. Root growth increased significantly using a combined N and P application at the AM site, whereas it did not increase at the SM and AC sites. The number of nodules at the AM site increased significantly following N application and the combined application of N and P. Root production was not significantly enhanced by nutrient application at the SM and AC sites. At the AM site, both P and N were in high demand despite a larger N pool compared with at the SM and AC sites. These results can be explained by the larger nutrient demand by legumes. We conclude that both N and P is limiting for AM plantations under natural conditions and that N fertilization may be more effective than expected, depending on the site conditions.Keywords: Acacia mangiumAraucaria cunninghamiiRoot-ingrowth coreSwietenia macrophyllaTropical plantations AcknowledgmentsThe authors thank Shinji Kaneko for his valuable comments on the draft report. This study was carried out as a part of an international cooperative research project between the Sabah Forestry Department and the Japan International Research Center for Agricultural Sciences and was funded by the Ministry of Agriculture, Forestry and Fisheries of Japan, "Development of Agroforestry Technology for the Rehabilitation of Tropical Forests."
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Claims 10
Claim · model-written summary
Combined nitrogen and phosphorus increased root growth at the Acacia site.
- Taxon
- Acacia mangium
Acacia mangiume1 - Treatment
- combined N and P applicatione0
- Outcome
- Root growthe0
- Direction
- increasede0
- Setting
- AM sitee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root growth increased significantly using a combined N and P application at the AM site”
e1“Acacia mangium (AM)”
Claim · model-written summary
Combined nitrogen and phosphorus did not increase root growth at the Swietenia site.
- Taxon
- Swietenia macrophylla
Swietenia macrophyllae1 - Treatment
- combined N and P applicatione2
- Outcome
- Root growthe3
- Direction
- did not increasee0
- Setting
- SMe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“whereas it did not increase at the SM and AC sites”
e1“Swietenia macrophylla (SM)”
e2“combined N and P application”
e3“Root growth”
Claim · model-written summary
Combined nitrogen and phosphorus did not increase root growth at the Araucaria site.
- Taxon
- Araucaria cunninghamii
Araucaria cunninghamiie1 - Treatment
- combined N and P applicatione2
- Outcome
- Root growthe3
- Direction
- did not increasee0
- Setting
- ACe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“whereas it did not increase at the SM and AC sites”
e1“Araucaria cunninghamii (AC)”
e2“combined N and P application”
e3“Root growth”
Claim · model-written summary
Nitrogen application significantly increased nodule number at the Acacia site.
- Taxon
- Acacia mangiumAcacia mangiume1
- Treatment
- N applicatione0
- Outcome
- number of nodulese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The number of nodules at the AM site increased significantly following N application and the combined application of N and P”
e1“Acacia mangium (AM)”
Claim · model-written summary
Combined nitrogen and phosphorus significantly increased nodule number at the Acacia site.
- Taxon
- Acacia mangiumAcacia mangiume1
- Treatment
- combined application of N and Pe0
- Outcome
- number of nodulese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The number of nodules at the AM site increased significantly following N application and the combined application of N and P”
e1“Acacia mangium (AM)”
Claim · model-written summary
Nutrient application did not significantly enhance root production at the Swietenia site.
- Taxon
- Swietenia macrophyllaSwietenia macrophyllae1
- Treatment
- nutrient applicatione0
- Outcome
- Root productione0
- Direction
- not significantly enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root production was not significantly enhanced by nutrient application at the SM and AC sites”
e1“Swietenia macrophylla (SM)”
Claim · model-written summary
Nutrient application did not significantly enhance root production at the Araucaria site.
- Taxon
- Araucaria cunninghamiiAraucaria cunninghamiie1
- Treatment
- nutrient applicatione0
- Outcome
- Root productione0
- Direction
- not significantly enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root production was not significantly enhanced by nutrient application at the SM and AC sites”
e1“Araucaria cunninghamii (AC)”
Claim · model-written summary
Acacia showed high demand for both phosphorus and nitrogen despite a larger nitrogen pool.
- Taxon
- Acacia mangiumAcacia mangiume1
- Outcome
- both P and N were in high demande0
- Comparator
- SM and AC sitese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At the AM site, both P and N were in high demand despite a larger N pool compared with at the SM and AC sites”
e1“Acacia mangium (AM)”
Claim · model-written summary
The authors conclude that nitrogen and phosphorus limit Acacia plantations under natural conditions.
- Taxon
- Acacia mangiumAcacia mangiume1
- Outcome
- AM plantationse0
- Qualifier
- both N and P is limitinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“both N and P is limiting for AM plantations under natural conditions”
e1“Acacia mangium (AM)”
Claim · model-written summary
Nitrogen fertilization may be more effective than expected depending on site conditions.
- Taxon
- Acacia mangiumAcacia mangiume1
- Outcome
- N fertilization may be more effective than expectede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N fertilization may be more effective than expected, depending on the site conditions”
e1“Acacia mangium (AM)”
The same questions in other papers
fertilization · yield · Swietenia macrophyllaPositive and negative results
1 in the opposite direction
- positive
phosphorus · growth · Araucaria cunninghamii (hoop pine)Positive and negative results
1 in the opposite direction
- positive
nitrogen · growth · Araucaria cunninghamii (hoop pine)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- positive
- no effect
nitrogen · growth · Acacia mangiumPositive and negative results
3 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- positive
1 paper more in this group
See all 5 papers →phosphorus · symbiosis · Acacia mangiumResults agree
1 paper in the same direction as this paper
- positive
nitrogen · symbiosis · Acacia mangiumResults agree
1 paper in the same direction as this paper
- positive
phosphorus · growth · Acacia mangiumResults agree
2 papers in the same direction as this paper
- positive
- positive
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.