Abstract
Early response of second -- rotation Pinus patula stands to nitrogen and phosphate fertilizers at Sao Hill forest plantations, tanzania. An investigation into the effect of fertilization on second -- rotation Pinus patula stands as an option for increasing growth and yield was initiated in April 1998 at two sites in the Sao Hill forest plantation, Iringa region, southwest Tanzania. Six factorial fertilizer treatments consisting of nitrogen (N) (0, 60 kg N ha -1 ) and phosphorus (P) (0, 30, 60 kg P ha -1 ) were assigned randomly to one-year-old P. patula seedlings in April 1999. Tree heights were measured at 7, 18, 22, 30 and 42 months after out-planting. Diameter at breast height (dbh) was measured from 22 months onwards. At 7 months, seedlings were significantly taller at Ngwazi (0.45 + 0.03 m) than at Msiwasi (0.36 + 0.04 m). In contrast, although not significant, by 42 months trees were slightly taller at Msiwasi (5.00 + 0.37 m) than at Ngwazi (4.87 + 0.46 m). Similarly, height increment measured at 42 months was significantly higher at Msiwasi. Msiwasi had significantly larger dbh trees (1.99 + 0.36 cm) than Ngwazi(1.62 + 0.0.30 cm) at 22 months, but these differences disappeared with time. Neither the application of N nor P had any effect on tree growth at Ngwazi. However, application of N depressed tree survival from 96 to 89% at Msiwasi. Application of P increased diameter and height growth at Msiwasi only. These results further stress the need for developing site-specific recommendations based on research studies.
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Claims 11
Claim · model-written summary
At seven months seedlings at Ngwazi were significantly taller than at Msiwasi.
- Taxon
- PINUS PATULA
Pinus patulat0 - Outcome
- seedlings were significantly tallere0
- Direction
- tallere0
- Value
- 0.45 + 0.03 me0
- Qualifier
- 0.36 + 0.04 me0
- Comparator
- Msiwasie0
- Setting
- Ngwazie0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At 7 months, seedlings were significantly taller at Ngwazi (0.45 + 0.03 m) than at Msiwasi (0.36 + 0.04 m)”
t0“PINUS PATULA”
Claim · model-written summary
At 42 months trees at Msiwasi were slightly taller than at Ngwazi, without significance.
- Taxon
- PINUS PATULAPinus patulat0
- Outcome
- trees were slightly tallere0
- Direction
- tallere0
- Value
- 5.00 + 0.37 me0
- Qualifier
- 4.87 + 0.46 me0
- Comparator
- Ngwazie0
- Setting
- Msiwasie0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“although not significant, by 42 months trees were slightly taller at Msiwasi (5.00 + 0.37 m) than at Ngwazi (4.87 + 0.46 m)”
t0“PINUS PATULA”
Claim · model-written summary
Height increment at 42 months was significantly higher at Msiwasi.
- Taxon
- PINUS PATULAPinus patulat0
- Outcome
- height incremente0
- Direction
- highere0
- Setting
- Msiwasie0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“height increment measured at 42 months was significantly higher at Msiwasi”
t0“PINUS PATULA”
Claim · model-written summary
At 22 months diameter at breast height was significantly larger at Msiwasi than Ngwazi.
- Taxon
- PINUS PATULAPinus patulat0
- Outcome
- dbhe0
- Direction
- largere0
- Value
- 1.99 + 0.36 cme0
- Qualifier
- 1.62 + 0.0.30 cme0
- Comparator
- Ngwazie0
- Setting
- Msiwasie0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Msiwasi had significantly larger dbh trees (1.99 + 0.36 cm) than Ngwazi(1.62 + 0.0.30 cm) at 22 months”
t0“PINUS PATULA”
Claim · model-written summary
The site differences in diameter at breast height disappeared over time.
- Taxon
- PINUS PATULAPinus patulat0
- Outcome
- differences disappeared with timee0
- Direction
- disappearede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“these differences disappeared with time”
t0“PINUS PATULA”
Claim · model-written summary
Nitrogen application had no effect on tree growth at Ngwazi.
- Taxon
- PINUS PATULAPinus patulat0
- Treatment
- application of Ne0
- Outcome
- tree growthe0
- Direction
- nor P had any effecte0
- Setting
- Ngwazie0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Neither the application of N nor P had any effect on tree growth at Ngwazi”
t0“PINUS PATULA”
Claim · model-written summary
Phosphorus application had no effect on tree growth at Ngwazi.
- Taxon
- PINUS PATULAPinus patulat0
- Treatment
- Pe0
- Outcome
- tree growthe0
- Direction
- had any effecte0
- Setting
- Ngwazie0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Neither the application of N nor P had any effect on tree growth at Ngwazi”
t0“PINUS PATULA”
Claim · model-written summary
Nitrogen application depressed tree survival from 96 to 89% at Msiwasi.
- Taxon
- PINUS PATULAPinus patulat0
- Treatment
- application of Ne0
- Outcome
- tree survivale0
- Direction
- depressede0
- Value
- 89%e0
- Qualifier
- 96e0
- Setting
- Msiwasie0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“application of N depressed tree survival from 96 to 89% at Msiwasi”
t0“PINUS PATULA”
Claim · model-written summary
Phosphorus application increased diameter growth at Msiwasi only.
- Taxon
- PINUS PATULAPinus patulat0
- Treatment
- Application of Pe0
- Outcome
- diametere0
- Direction
- increasede0
- Setting
- Msiwasie0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of P increased diameter and height growth at Msiwasi only”
t0“PINUS PATULA”
Claim · model-written summary
Phosphorus application increased height growth at Msiwasi only.
- Taxon
- PINUS PATULAPinus patulat0
- Treatment
- Application of Pe0
- Outcome
- height growthe0
- Direction
- increasede0
- Setting
- Msiwasie0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of P increased diameter and height growth at Msiwasi only”
t0“PINUS PATULA”
Claim · model-written summary
The authors recommend developing site-specific fertilizer recommendations based on research.
- Taxon
- PINUS PATULAPinus patulat0
- Outcome
- developing site-specific recommendations based on research studiese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“need for developing site-specific recommendations based on research studies”
t0“PINUS PATULA”
The same questions in other papers
nitrogen · growth · Pinus patula (Mexican weeping pine)Positive and negative results
2 in the opposite direction
- positive
- positive
phosphorus · growth · Pinus patula (Mexican weeping pine)Results agree
1 paper in the same direction as this paper
- 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.