Abstract
SUMMARY Seedlings of Pinus contorta were grown for 16 wk without ectomycorrhizas in the greenhouse at three levels of irradiance (100, 210 and 470 μEm ‐2 s ‐1 ) and three levels of ammonium nitrate (3, 62 and 248 mg litre ‐1 of N). Measurements at 5, 10 and 16 wk of age indicated that plants receiving the highest levels of irradiance and nitrogen had significantly larger biomass, a higher total foliar N and P content and net photosynthesis per unit leaf area than those at lower levels of each factor. Although the root/shoot ratio also increased from low to high irradiance at each harvest, nitrogen application resulted in an increased ratio from 3 to 62 mg litre ‐1 N, but decreased ratio at 248 mg litre ‐1 N.
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Claims 6
Claim · model-written summary
Highest irradiance and nitrogen levels gave significantly larger biomass in Pinus contorta seedlings than lower levels
- Taxon
- Pinus contorta
Pinus contortae0 - Treatment
- the highest levels of irradiance and nitrogene1
- Outcome
- biomasse1
- Direction
- largere1
- Comparator
- lower levels of each factore1
- Setting
- greenhousee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seedlings of Pinus contorta were grown for 16 wk without ectomycorrhizas in the greenhouse at three levels of irradiance”
e1“plants receiving the highest levels of irradiance and nitrogen had significantly larger biomass, a higher total foliar N and P content and net photosynthesis per unit leaf area than those at lower levels of each factor”
Claim · model-written summary
Highest irradiance and nitrogen levels gave a higher total foliar N and P content in Pinus contorta seedlings than lower levels
- Taxon
- Pinus contortaPinus contortae0
- Treatment
- the highest levels of irradiance and nitrogene1
- Outcome
- total foliar N and P contente1
- Direction
- highere1
- Comparator
- lower levels of each factore1
- Setting
- greenhousee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seedlings of Pinus contorta were grown for 16 wk without ectomycorrhizas in the greenhouse at three levels of irradiance”
e1“plants receiving the highest levels of irradiance and nitrogen had significantly larger biomass, a higher total foliar N and P content and net photosynthesis per unit leaf area than those at lower levels of each factor”
Claim · model-written summary
Highest irradiance and nitrogen levels gave higher net photosynthesis per unit leaf area in Pinus contorta seedlings than lower levels
- Taxon
- Pinus contortaPinus contortae0
- Treatment
- the highest levels of irradiance and nitrogene1
- Outcome
- net photosynthesis per unit leaf areae1
- Direction
- highere1
- Comparator
- lower levels of each factore1
- Setting
- greenhousee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seedlings of Pinus contorta were grown for 16 wk without ectomycorrhizas in the greenhouse at three levels of irradiance”
e1“plants receiving the highest levels of irradiance and nitrogen had significantly larger biomass, a higher total foliar N and P content and net photosynthesis per unit leaf area than those at lower levels of each factor”
Claim · model-written summary
Root/shoot ratio of Pinus contorta increased from low to high irradiance at each harvest
- Taxon
- Pinus contortaPinus contortae0
- Treatment
- irradiancee2
- Outcome
- root/shoot ratioe2
- Direction
- increasede2
- Comparator
- lowe2
- Setting
- greenhousee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seedlings of Pinus contorta were grown for 16 wk without ectomycorrhizas in the greenhouse at three levels of irradiance”
e2“Although the root/shoot ratio also increased from low to high irradiance at each harvest”
Claim · model-written summary
Nitrogen application increased the root/shoot ratio of Pinus contorta from 3 to 62 mg per litre
- Taxon
- Pinus contortaPinus contortae0
- Treatment
- nitrogen applicatione3
- Outcome
- root/shoot ratioe2
- Direction
- increasede3
- Value
- 3 to 62 mg litree3
- Comparator
- from 3e3
- Setting
- greenhousee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seedlings of Pinus contorta were grown for 16 wk without ectomycorrhizas in the greenhouse at three levels of irradiance”
e2“Although the root/shoot ratio also increased from low to high irradiance at each harvest”
e3“nitrogen application resulted in an increased ratio from 3 to 62 mg litre”
Claim · model-written summary
Nitrogen at 248 mg per litre decreased the root/shoot ratio of Pinus contorta
- Taxon
- Pinus contortaPinus contortae0
- Treatment
- nitrogen applicatione3
- Outcome
- root/shoot ratioe2
- Direction
- decreasede4
- Value
- 248e4
- Comparator
- from 3e3
- Setting
- greenhousee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seedlings of Pinus contorta were grown for 16 wk without ectomycorrhizas in the greenhouse at three levels of irradiance”
e2“Although the root/shoot ratio also increased from low to high irradiance at each harvest”
e3“nitrogen application resulted in an increased ratio from 3 to 62 mg litre”
e4“but decreased ratio at 248 mg litre”
The same questions in other papers
light · growth · Pinus contorta (lodgepole pine)Positive and negative results
2 in the opposite direction
- negative
- no effect
nitrogen · growth · Pinus contorta (lodgepole pine)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- negative
- 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.