Abstract
Yield of black cottonwood (Populustrichocarpa Torr. and Gray) in 2-year rotations was affected in the first rotation by spacing and fertilization. Closest spacing (0.30 × 0.30 m) resulted in highest yield in the first rotation whereas in the second rotation, yield was not significantly affected by spacing. The average fresh weight yields were 13.4 tons/hectare/year in the first harvest and 20.9 tons/hectare/year in the second harvest. Initial fertilization with both N, and N, P, and K fertilizers improved growth in the first harvest but not in the second. During the first year, triazine herbicides controlled weeds but caused slight damage to the plants. Although there were no significant differences in yield between the herbicides, atrazine (2-chloro-4-ethylamino-6-isopropylamino-s-triazine) reduced survival and first year height growth below that obtained with propazine (2-chloro-4, 6-bis[isopropylamino]-s-triazine) or simazine (2-chloro-4, 6-bis-ethylamino-s-triazine). Yield results and limited pulping studies show that short rotation black cottonwood has potential value for pulp fiber production.
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Claims 11
Claim · model-written summary
Closest spacing gave the highest yield of black cottonwood in the first rotation.
- Taxon
- black cottonwood
Populus trichocarpae0 - Treatment
- Closest spacing (0.30 × 0.30 m)e1
- Outcome
- yielde1
- Direction
- higheste1
- Qualifier
- in the first rotatione1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yield of black cottonwood”
e1“Closest spacing (0.30 × 0.30 m) resulted in highest yield in the first rotation”
Claim · model-written summary
Spacing did not significantly affect black cottonwood yield in the second rotation.
- Taxon
- black cottonwoodPopulus trichocarpae0
- Treatment
- spacinge2
- Outcome
- yielde2
- Direction
- not significantly affectede2
- Qualifier
- in the second rotatione2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yield of black cottonwood”
e2“in the second rotation, yield was not significantly affected by spacing”
Claim · model-written summary
Black cottonwood fresh weight yield was 13.4 tons/hectare/year in the first harvest.
- Taxon
- black cottonwoodPopulus trichocarpae0
- Outcome
- fresh weight yieldse3
- Value
- 13.4 tons/hectare/yeare3
- Qualifier
- first harveste3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yield of black cottonwood”
e3“The average fresh weight yields were 13.4 tons/hectare/year in the first harvest and 20.9 tons/hectare/year in the second harvest”
Claim · model-written summary
Black cottonwood fresh weight yield was 20.9 tons/hectare/year in the second harvest.
- Taxon
- black cottonwoodPopulus trichocarpae0
- Outcome
- fresh weight yieldse3
- Value
- 20.9 tons/hectare/yeare3
- Qualifier
- second harveste3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yield of black cottonwood”
e3“The average fresh weight yields were 13.4 tons/hectare/year in the first harvest and 20.9 tons/hectare/year in the second harvest”
Claim · model-written summary
Initial fertilization with N, and N, P, and K improved black cottonwood growth in the first harvest.
- Taxon
- black cottonwoodPopulus trichocarpae0
- Treatment
- Initial fertilization with both N, and N, P, and K fertilizerse4
- Outcome
- growthe4
- Direction
- improvede4
- Qualifier
- in the first harveste4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yield of black cottonwood”
e4“Initial fertilization with both N, and N, P, and K fertilizers improved growth in the first harvest but not in the second”
Claim · model-written summary
Initial fertilization with N, and N, P, and K did not change black cottonwood growth in the second harvest.
- Taxon
- black cottonwoodPopulus trichocarpae0
- Treatment
- Initial fertilization with both N, and N, P, and K fertilizerse4
- Outcome
- growthe4
- Direction
- no_changeinferrede4
- Qualifier
- in the seconde4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yield of black cottonwood”
e4“Initial fertilization with both N, and N, P, and K fertilizers improved growth in the first harvest but not in the second”
Claim · model-written summary
Triazine herbicides controlled weeds in black cottonwood plantings.
- Taxon
- black cottonwoodPopulus trichocarpae0
- Treatment
- triazine herbicidese5
- Interactor
- weedse5weed
- Outcome
- weedse5
- Direction
- controllede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yield of black cottonwood”
e5“triazine herbicides controlled weeds but caused slight damage to the plants”
Claim · model-written summary
Triazine herbicides caused slight damage to black cottonwood plants.
- Taxon
- black cottonwoodPopulus trichocarpae0
- Treatment
- triazine herbicidese5
- Outcome
- slight damage to the plantse5
- Direction
- increaseinferrede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yield of black cottonwood”
e5“triazine herbicides controlled weeds but caused slight damage to the plants”
Claim · model-written summary
Atrazine reduced black cottonwood survival and first year height growth below propazine or simazine.
- Taxon
- black cottonwoodPopulus trichocarpae0
- Treatment
- atrazinee6
- Outcome
- survival and first year height growthe6
- Direction
- reducede6
- Comparator
- propazine (2-chloro-4, 6-bis[isopropylamino]-s-triazine) or simazine (2-chloro-4, 6-bis-ethylamino-s-triazine)e6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yield of black cottonwood”
e6“atrazine (2-chloro-4-ethylamino-6-isopropylamino-s-triazine) reduced survival and first year height growth below that obtained with propazine (2-chloro-4, 6-bis[isopropylamino]-s-triazine) or simazine (2-chloro-4, 6-bis-ethylamino-s-triazine)”
Claim · model-written summary
Herbicides did not significantly differ in black cottonwood yield.
- Taxon
- black cottonwoodPopulus trichocarpae0
- Treatment
- herbicidese7
- Outcome
- yielde7
- Direction
- no significant differencese7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yield of black cottonwood”
e7“Although there were no significant differences in yield between the herbicides”
Claim · model-written summary
Short-rotation black cottonwood has potential value for pulp fiber production.
- Taxon
- black cottonwoodPopulus trichocarpae7
- Outcome
- potential value for pulp fiber productione7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“Yield results and limited pulping studies show that short rotation black cottonwood has potential value for pulp fiber production”
The same questions in other papers
fertilization · growth · Populus trichocarpa (black cottonwood)Positive 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 →density · yield · Populus trichocarpa (black cottonwood)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.