Abstract
Abstract Trees propagated from cuttings of 22 clones of Populus deltoides were grown under unfertilized and nitrogen‐fertilized conditions. Large increases in growth resulted from fertilization. A strong clone × fertilizer interaction was observed for diameter, height, and volume growth. Wood specific gravity was reduced by fertilization but no interaction between clones and fertilizers was noted for that character after 2 years. The presence of the genotype‐environment interaction indicated that it would be unwise to select eastern cottonwood from a nutritional environment other than the one in which it will ultimately grow. Frequently a clone which performed poorly under unfertilized conditions excelled when fertilized and in several instances the reverse was true. This suggests the possibility that selection can be made specifically for fertilizer response in tree improvement programs. Caution should be exercised when interpreting fertilizer response of experimental populations which might contain genetic bias.
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Claims 8
Claim · model-written summary
Fertilization produced large growth increases in Populus deltoides.
- Taxon
- Populus deltoides
Populus deltoidest0 - Treatment
- fertilizatione0
- Outcome
- growthe0
- Direction
- increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Large increases in growth resulted from fertilization.”
t0“Populus deltoides”
Claim · model-written summary
A strong clone-by-fertilizer interaction occurred for diameter, height and volume growth.
- Taxon
- Populus deltoidesPopulus deltoidest0
- Treatment
- fertilizere0
- Outcome
- diameter, height, and volume growthe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A strong clone × fertilizer interaction was observed for diameter, height, and volume growth.”
t0“Populus deltoides”
Claim · model-written summary
Fertilization reduced wood specific gravity.
- Taxon
- Populus deltoidesPopulus deltoidest0
- Treatment
- fertilizatione0
- Outcome
- Wood specific gravitye0
- Direction
- reducede0
- Qualifier
- after 2 yearse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Wood specific gravity was reduced by fertilization but no interaction between clones and fertilizers was noted for that character after 2 years.”
t0“Populus deltoides”
Claim · model-written summary
No clone-by-fertilizer interaction was noted for wood specific gravity after two years.
- Taxon
- Populus deltoidesPopulus deltoidest0
- Material
- clonese0
- Outcome
- Wood specific gravitye0
- Direction
- no interactione0
- Qualifier
- after 2 yearse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Wood specific gravity was reduced by fertilization but no interaction between clones and fertilizers was noted for that character after 2 years.”
t0“Populus deltoides”
Claim · model-written summary
Cottonwood should be selected in the nutritional environment in which it will grow.
Verbatim
e0“it would be unwise to select eastern cottonwood from a nutritional environment other than the one in which it will ultimately grow”
Claim · model-written summary
Clones performing poorly without fertilizer frequently excelled with fertilizer, with the reverse occurring in several instances.
- Taxon
- Populus deltoidesPopulus deltoidest0
- Treatment
- fertilizede0
- Outcome
- excellede0
- Direction
- excellede0
- Comparator
- unfertilized conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Frequently a clone which performed poorly under unfertilized conditions excelled when fertilized and in several instances the reverse was true.”
t0“Populus deltoides”
Claim · model-written summary
Selection specifically for fertilizer response may be possible in tree improvement programs.
- Taxon
- Populus deltoidesPopulus deltoidest0
- Outcome
- selection can be made specifically for fertilizer responsee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This suggests the possibility that selection can be made specifically for fertilizer response in tree improvement programs.”
t0“Populus deltoides”
Claim · model-written summary
Fertilizer response in potentially genetically biased experimental populations should be interpreted cautiously.
- Taxon
- Populus deltoidesPopulus deltoidest0
- Outcome
- Caution should be exercised when interpreting fertilizer responsee0
- Qualifier
- experimental populations which might contain genetic biase0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Caution should be exercised when interpreting fertilizer response of experimental populations which might contain genetic bias.”
t0“Populus deltoides”
The same questions in other papers
fertilization · growth · Populus deltoidesResults agree
5 papers in the same direction as this paper
- positive
- positive
- positive
2 papers more in this group
See all 6 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.