Abstract
A plantation of lodgepole pine ( Pinus contorta Dougl.), which was established in 1973 on a ditched minerotrophic fen at planting spacings of 1.2 m, 1.8 m, and 2.4 m, was refertilized in 1985 with control, P, PK and NPK treatments consisting of 60 kg ha −1 phosphorus, 100 kg ha −1 potassium and 200 kg ha −1 nitrogen. Although each seedling had been spot-fertilized in 1973 with a mixture of 71 g urea, 99 g ground rock phosphate and 41 g potassium sulphate, height and needle nutrient assessments of the plantation in 1984 indicated poor growth, low concentrations of needle nitrogen (1.26 per cent) and possible deficiency levels of needle phosphorus (0.10 per cent) and potassium (0.36 per cent). Between 1985 and 1991, height and diameter growth increased significantly in all refertilization treatments. Growth response was greatest in the PK treatment and least in the P treatment. Needle weights, determined from 1987 to 1991, did not respond uniformly to any of the refertilization treatments. Needle concentrations of phosphorus increased to levels between 0.20 per cent and 0.23 per cent following refertilization with P, PK, and NPK, but by 1988 had decreased to about 0.14 per cent. Needle concentrations of potassium also increased sharply to 0.60 per cent in 1985 following refertilization with PK and NPK, but by 1988 had decreased to levels between 0.35 per cent and 0.45 per cent. Similarly, needle nitrogen concentrations increased to 1.84 per cent in 1985 following refertilization with NPK, then decreased to levels between 1.20 per cent and 1.33 per cent in 1986 and remained at those levels each year thereafter. Although needle nutrient levels fell sharply following an initial peak after refertilization, height and diameter growth did not decrease significantly, especially in the PK treatment, suggesting that nutrient levels remained adequate for optimum growth.
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Claims 7
Claim · model-written summary
Height and diameter growth of lodgepole pine increased significantly in all refertilization treatments between 1985 and 1991 compared with control.
- Taxon
- Lodgepole Pine
Pinus contortat0 - Treatment
- refertilized in 1985 with control, P, PK and NPK treatmentse0
- Outcome
- height and diameter growthe1
- Direction
- increasede1
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lodgepole Pine (Pinus contorta Dougl.)”
e0“was refertilized in 1985 with control, P, PK and NPK treatments consisting of 60 kg ha −1 phosphorus, 100 kg ha −1 potassium and 200 kg ha −1 nitrogen”
e1“Between 1985 and 1991, height and diameter growth increased significantly in all refertilization treatments”
Claim · model-written summary
Growth response of lodgepole pine was greatest in the PK treatment and least in the P treatment.
- Taxon
- Lodgepole PinePinus contortat0
- Treatment
- PK treatmente2
- Outcome
- Growth responsee2
- Direction
- greateste2
- Comparator
- P treatmente2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lodgepole Pine (Pinus contorta Dougl.)”
e2“Growth response was greatest in the PK treatment and least in the P treatment”
Claim · model-written summary
Needle weights did not respond uniformly to any of the refertilization treatments compared with control.
- Taxon
- Lodgepole PinePinus contortat0
- Treatment
- refertilization treatmentse3
- Outcome
- Needle weightse3
- Direction
- did not respond uniformlye3
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lodgepole Pine (Pinus contorta Dougl.)”
e0“was refertilized in 1985 with control, P, PK and NPK treatments consisting of 60 kg ha −1 phosphorus, 100 kg ha −1 potassium and 200 kg ha −1 nitrogen”
e3“Needle weights, determined from 1987 to 1991, did not respond uniformly to any of the refertilization treatments”
Claim · model-written summary
Needle phosphorus concentrations increased to between 0.20 and 0.23 per cent following refertilization with P, PK and NPK.
- Taxon
- Lodgepole PinePinus contortat0
- Treatment
- refertilization with P, PK, and NPKe4
- Outcome
- Needle concentrations of phosphoruse4
- Direction
- increasede4
- Value
- between 0.20 per cent and 0.23 per cente4
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lodgepole Pine (Pinus contorta Dougl.)”
e0“was refertilized in 1985 with control, P, PK and NPK treatments consisting of 60 kg ha −1 phosphorus, 100 kg ha −1 potassium and 200 kg ha −1 nitrogen”
e4“Needle concentrations of phosphorus increased to levels between 0.20 per cent and 0.23 per cent following refertilization with P, PK, and NPK”
Claim · model-written summary
Needle potassium concentrations increased sharply to 0.60 per cent in 1985 following refertilization with PK and NPK.
- Taxon
- Lodgepole PinePinus contortat0
- Treatment
- refertilization with PK and NPKe5
- Outcome
- Needle concentrations of potassiume5
- Direction
- increasede5
- Value
- 0.60 per cente5
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lodgepole Pine (Pinus contorta Dougl.)”
e0“was refertilized in 1985 with control, P, PK and NPK treatments consisting of 60 kg ha −1 phosphorus, 100 kg ha −1 potassium and 200 kg ha −1 nitrogen”
e5“Needle concentrations of potassium also increased sharply to 0.60 per cent in 1985 following refertilization with PK and NPK”
Claim · model-written summary
Needle nitrogen concentrations increased to 1.84 per cent in 1985 following refertilization with NPK.
- Taxon
- Lodgepole PinePinus contortat0
- Treatment
- refertilization with NPKe6
- Outcome
- needle nitrogen concentrationse6
- Direction
- increasede6
- Value
- 1.84 per cente6
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lodgepole Pine (Pinus contorta Dougl.)”
e0“was refertilized in 1985 with control, P, PK and NPK treatments consisting of 60 kg ha −1 phosphorus, 100 kg ha −1 potassium and 200 kg ha −1 nitrogen”
e6“Similarly, needle nitrogen concentrations increased to 1.84 per cent in 1985 following refertilization with NPK”
Claim · model-written summary
Height and diameter growth did not decrease significantly after the needle nutrient peaks, suggesting nutrient levels stayed adequate for optimum growth.
- Taxon
- Lodgepole PinePinus contortat0
- Outcome
- height and diameter growthe7
- Direction
- did not decrease significantlye7
- Qualifier
- nutrient levels remained adequate for optimum growthe7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lodgepole Pine (Pinus contorta Dougl.)”
e7“height and diameter growth did not decrease significantly, especially in the PK treatment, suggesting that nutrient levels remained adequate for optimum growth”
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fertilization · nutrient: content · Pinus contorta (lodgepole pine)Results agree
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- positive
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1 paper more in this group
See all 5 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.