Abstract
A 48-year-old stand of Acersaccharum Marsh. and A. rubrum L. in northeastern Wisconsin, U.S.A., was fertilized with 168 kg/ha (150 lb/acre) of elemental N, P, N + P, or N + P + K in May 1966. Trees were stratified by crown class and initial diameter. Ten-year diameter and basal area growth were evaluated by analysis of covariance with initial plot basal area (IBA) as the covariate and by stepwise multiple regression in hierarchal models. Both diameter and basal area growth were influenced greatly by initial diameter and stand density. IBA accounted for 65% of the variation in diameter growth and 49% of the variation in basal area growth.Fertilization decreased diameter growth and increased mortality of suppressed trees. Pole-sized maples in intermediate and codominant crown positions tended to respond to fertilization with N and N + P but the differences were not statistically significant. Dominant trees grew more than did intermediates or codominants, but fertilization response could not be evaluated. Treatment effects were confounded by widely varied stand and site conditions. Results illustrate conditions likely to be encountered in fertilizing northern hardwoods on an operational scale.
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Claims 8
Claim · model-written summary
Initial diameter and stand density greatly influenced maple diameter and basal area growth.
Verbatim
e0“Both diameter and basal area growth were influenced greatly by initial diameter and stand density”
t0“maple stand”
Claim · model-written summary
Initial plot basal area accounted for 65% of variation in maple diameter growth.
Not reportedDirection
Verbatim
e0“IBA accounted for 65% of the variation in diameter growth”
e1“initial plot basal area (IBA)”
t0“maple stand”
Claim · model-written summary
Initial plot basal area accounted for 49% of variation in maple basal area growth.
Not reportedDirection
Verbatim
e0“49% of the variation in basal area growth”
e1“initial plot basal area (IBA)”
t0“maple stand”
Claim · model-written summary
Fertilization decreased diameter growth of suppressed maples.
- Taxon
- maplet0
- Treatment
- Fertilizatione0
- Outcome
- diameter growthe0
- Direction
- decreasede0
- Qualifier
- suppressed treese0
Not reportedComparator
Verbatim
e0“Fertilization decreased diameter growth and increased mortality of suppressed trees”
t0“maple stand”
Claim · model-written summary
Fertilization increased mortality of suppressed maples.
- Taxon
- maplet0
- Treatment
- Fertilizatione0
- Outcome
- mortalitye0
- Direction
- increasede0
- Qualifier
- suppressed treese0
Not reportedComparator
Verbatim
e0“Fertilization decreased diameter growth and increased mortality of suppressed trees”
t0“maple stand”
Claim · model-written summary
Intermediate and codominant pole-sized maples tended to respond to nitrogen fertilization, without a statistically significant difference.
- Taxon
- maplese0
- Treatment
- Ne0
- Outcome
- respond to fertilizatione0
- Direction
- tended to responde0
- Qualifier
- intermediate and codominant crown positionse0
Not reportedComparator
Verbatim
e0“Pole-sized maples in intermediate and codominant crown positions tended to respond to fertilization with N and N + P but the differences were not statistically significant”
Claim · model-written summary
Intermediate and codominant pole-sized maples tended to respond to nitrogen plus phosphorus fertilization, without a statistically significant difference.
- Taxon
- maplese0
- Treatment
- N + Pe0
- Outcome
- respond to fertilizatione0
- Direction
- tended to responde0
- Qualifier
- intermediate and codominant crown positionse0
Not reportedComparator
Verbatim
e0“Pole-sized maples in intermediate and codominant crown positions tended to respond to fertilization with N and N + P but the differences were not statistically significant”
Claim · model-written summary
Dominant maples grew more than intermediate or codominant maples.
Verbatim
e0“Dominant trees grew more than did intermediates or codominants”
t0“maple stand”