Abstract
In Grey County, southern Ontario, a crop-tree release and fertilization experiment was carried out in 35- to 85-year-old hardwood stands of variable composition. The objective of the treatments was to improve the growth rate of selected high-quality trees. A method is described for the selection and allocation of crop trees to treatments according to a competition index (CI). Release involved thinning to reduce a tree's CI by nominal levels 0, 50, and 75%. Fertilizer was applied within a circular plot equal to 1.5 times the crown radii at rates of N = 295 and 590 kg/ha (ureaform); P = 227 and 454 kg/ha (triple superphosphate). Fertilization resulted in increased foliar concentrations of N and P in sugar maple (Acersaccharum Marsh.), white ash (Fraxinusamericana L.), and black cherry (Prunusserotina Ehrh), but only black cherry responded to N fertilizer with an increase in diameter growth; none responded to P fertilizer. The diameter growth of sugar maple showed a response that was linearly related to the degree of release. Black cherry and white ash showed only small responses to release. It was concluded that P was not limiting to any species on these soils, and N may be limiting only to black cherry. Crop-tree release was an effective treatment for stimulating the growth of sugar maple, but it appeared to be relatively ineffective for white ash or black cherry at this age.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 5
Claim · model-written summary
Fertilization increased foliar N and P concentrations in sugar maple, white ash and black cherry
- Taxon
- sugar maple (Acersaccharum Marsh.), white ash (Fraxinusamericana L.), and black cherry (Prunusserotina Ehrh)
Acer saccharum
Prunus serotina
Fraxinus americanae1 - Treatment
- Fertilizatione1
- Outcome
- foliar concentrations of N and Pe1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Fertilization resulted in increased foliar concentrations of N and P in sugar maple (Acersaccharum Marsh.), white ash (Fraxinusamericana L.), and black cherry (Prunusserotina Ehrh)”
Claim · model-written summary
N fertilizer increased diameter growth of black cherry
- Taxon
- black cherryPrunus serotinae2
- Treatment
- N fertilizere2
- Outcome
- diameter growthe2
- Direction
- increasee2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“only black cherry responded to N fertilizer with an increase in diameter growth”
Claim · model-written summary
P fertilizer did not change growth of any of the three species
- Taxon
- sugar maple (Acersaccharum Marsh.), white ash (Fraxinusamericana L.), and black cherry (Prunusserotina Ehrh)Acer saccharumPrunus serotinaFraxinus americanae1
- Treatment
- P fertilizere3
- Outcome
- respondede3
- Direction
- none respondede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Fertilization resulted in increased foliar concentrations of N and P in sugar maple (Acersaccharum Marsh.), white ash (Fraxinusamericana L.), and black cherry (Prunusserotina Ehrh)”
e3“none responded to P fertilizer”
Claim · model-written summary
Sugar maple diameter growth response was linearly related to degree of release
- Taxon
- sugar mapleAcer saccharume4
- Treatment
- degree of releasee4
- Outcome
- diameter growthe4
- Direction
- increaseinferrede4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“The diameter growth of sugar maple showed a response that was linearly related to the degree of release”
Claim · model-written summary
Black cherry and white ash showed only small growth responses to crop-tree release
- Taxon
- Black cherry and white ashPrunus serotinaFraxinus americanae5
- Treatment
- releasee5
- Outcome
- responsese5
- Direction
- smalle5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“Black cherry and white ash showed only small responses to release”
The same questions in other papers
fertilization · growth · Prunus serotina (black cherry)Results agree
2 papers in the same direction as this paper
- 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.