Abstract
An experiment was carried out to investigate the possibilities of accelerating seedling growth in three of the most important forest tree species by increasing CO 2 concentration, daylength and nutrition. Doubling the frequency of application of a standard liquid feed increased plant height by 8–10 per cent but extending the daylength to 18 h had only a small initial effect which was not sustained. Increasing the CO 2 concentration significantly increased growth in both Sitka spruce and lodgepole pine but similar increases with Corsican pine were not statistically significant. The results indicated that under the conditions of the experiment the tree height normally achieved after 16 weeks could be attained in 14 to 15 weeks by increasing the CO 2 concentration fourfold.
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Claims 6
Claim · model-written summary
Doubling liquid-feed frequency increased seedling height by 8–10 per cent.
- Taxon
- Forest Tree Plantst0
- Treatment
- Doubling the frequency of application of a standard liquid feede0
- Outcome
- plant heighte0
- Direction
- increasede0
- Value
- 8–10 per cente0
Not reportedComparator
Verbatim
e0“Doubling the frequency of application of a standard liquid feed increased plant height by 8–10 per cent”
t0“Young Forest Tree Plants”
Claim · model-written summary
Extending daylength to 18 h had a small initial growth effect that was not sustained.
- Taxon
- Forest Tree Plantst0
- Treatment
- extending the daylength to 18 he0
- Outcome
- small initial effect which was not sustainede0
- Direction
- small initial effect which was not sustainede0
Not reportedComparator
Verbatim
e0“extending the daylength to 18 h had only a small initial effect which was not sustained”
t0“Young Forest Tree Plants”
Claim · model-written summary
Higher CO2 significantly increased Sitka spruce growth.
- Taxon
- Sitka spruce
.jpg?width=60)
Picea sitchensise0 - Treatment
- Increasing the CO 2 concentratione0
- Outcome
- growthe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Increasing the CO 2 concentration significantly increased growth in both Sitka spruce and lodgepole pine”
Claim · model-written summary
Higher CO2 significantly increased lodgepole pine growth.
- Taxon
- lodgepole pine
Pinus contortae0 - Treatment
- Increasing the CO 2 concentratione0
- Outcome
- growthe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing the CO 2 concentration significantly increased growth in both Sitka spruce and lodgepole pine”
Claim · model-written summary
Similar growth increases in Corsican pine were not statistically significant.
- Taxon
- Corsican pine
Pinus nigra subsp. laricioe0 - Treatment
- CO2t0
- Outcome
- increasese0
- Direction
- increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“similar increases with Corsican pine were not statistically significant”
t0“Effects of CO2, Daylength and Nutrition”
Claim · model-written summary
Fourfold CO2 enabled the 16-week tree height in 14 to 15 weeks.
Verbatim
e0“tree height normally achieved after 16 weeks could be attained in 14 to 15 weeks by increasing the CO 2 concentration fourfold”
t0“Forest Tree Plants”
The same questions in other papers
co2 · growth · Picea sitchensis (Sitka spruce)Results differ
3 papers in the same direction as this paper · 4 in the opposite direction
- no effect
- negative
- no effect
4 papers more in this group
See all 8 papers →co2 · growth · Pinus contorta (lodgepole 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.