Abstract
Nitrogen fertilization rate trials (0–672 kg/ha) were established in seven second-growth mixed deciduous forest stands in southern New York, on well to somewhat poorly drained soils typical of better hardwood sites, with no history of fire or cultivation. Basal-area growth over 20 years was determined from increment cores of dominant and codominant trees. Significant growth response occurred only for black cherry (Prunusserotina Ehrh.). Nitrogen additions of 168–336 kg/ha increased growth 21% over 5–10 years. Ten-year basal-area growth response of sugar maple (Acersaccharum Marsh.) and white ash (Fraxinusamericana L.) was less than in other fertilization studies. The lack of response is attributed to favorable nitrogen status of the soils, resulting from lack of disturbance over at least the last four decades and, possibly, atmospheric input of nitrogen.
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Claims 4
Claim · model-written summary
Nitrogen additions of 168–336 kg/ha increased black cherry growth by 21% over 5–10 years.
- Taxon
- black cherry
Prunus serotinae1 - Treatment
- Nitrogen additions of 168–336 kg/hae2
- Outcome
- growthe2
- Direction
- increasede2
- Value
- 21%e2
- Qualifier
- over 5–10 yearse2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Significant growth response occurred only for black cherry (Prunusserotina Ehrh.)”
e2“Nitrogen additions of 168–336 kg/ha increased growth 21% over 5–10 years”
Claim · model-written summary
Significant growth response to nitrogen fertilization occurred only for black cherry.
- Taxon
- black cherryPrunus serotinae1
- Treatment
- Nitrogen fertilizatione0
- Outcome
- growth responsee1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen fertilization rate trials (0–672 kg/ha)”
e1“Significant growth response occurred only for black cherry (Prunusserotina Ehrh.)”
Claim · model-written summary
Ten-year basal-area growth response of sugar maple to nitrogen fertilization was less than in other fertilization studies.
- Taxon
- sugar maple
Acer saccharume3 - Treatment
- Nitrogen fertilizatione0
- Outcome
- Ten-year basal-area growth responsee3
- Direction
- less thane3
- Comparator
- other fertilization studiese3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen fertilization rate trials (0–672 kg/ha)”
e3“Ten-year basal-area growth response of sugar maple (Acersaccharum Marsh.) and white ash (Fraxinusamericana L.) was less than in other fertilization studies”
Claim · model-written summary
Ten-year basal-area growth response of white ash to nitrogen fertilization was less than in other fertilization studies.
- Taxon
- white ash
Fraxinus americanae3 - Treatment
- Nitrogen fertilizatione0
- Outcome
- Ten-year basal-area growth responsee3
- Direction
- less thane3
- Comparator
- other fertilization studiese3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen fertilization rate trials (0–672 kg/ha)”
e3“Ten-year basal-area growth response of sugar maple (Acersaccharum Marsh.) and white ash (Fraxinusamericana L.) was less than in other fertilization studies”
The same questions in other papers
fertilization · growth · Fraxinus americana (white ash)Positive and negative results
1 in the opposite direction
- positive
fertilization · growth · Acer saccharum (sugar maple)Positive and negative results
3 in the opposite direction
- positive
- positive
- positive
nitrogen · growth · Prunus serotina (black cherry)Results agree
1 paper in the same direction as this paper
- positive
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.