Abstract
Growth and nutrient uptake of containerized fraser fir ( Abies fraseri) seedlings in response to irrigation and fertilization was investigated for 2 years in a greenhouse experiment. Height and stem diameter growth increased 12% to 35% and 4% to 32%, respectively, with increased irrigation. There was an inverse relationship between irrigation and foliar nitrogen content and no irrigation effect on foliar phosphorus, potassium, magnesium, and manganese. Irrigation increased foliar calcium. Approximately 2.0% to 4.5% of applied nitrogen was lost through leaching. Increases in total biomass in high irrigation treatments were caused by higher root and stem biomass. Higher irrigation treatments increased nitrogen use efficiency (NUE) and assimilatory nitrogen use efficiency probably as a result of increase in carbon assimilation efficiency leading to increase in net primary productivity. There was no clear effect on the root weight ratio, but the index nitrogen availability per unit of foliage indicated a higher availability in plants receiving the lowest irrigation. This suggests that under water stress, the decrease in assimilation and NUE may be buffered by an increase in the plant's ability to provide nitrogen and other nutrients to various organs.
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Claims 12
Claim · model-written summary
Height growth increased by 12% to 35% with increased irrigation.
- Taxon
- fraser firt0
- Treatment
- increased irrigatione0
- Outcome
- Heighte0
- Direction
- increasede0
- Value
- 12% to 35%e0
Not reportedComparator
Verbatim
e0“Height and stem diameter growth increased 12% to 35% and 4% to 32%, respectively, with increased irrigation.”
t0“fraser fir”
Claim · model-written summary
Stem diameter growth increased by 4% to 32% with increased irrigation.
- Taxon
- fraser firt0
- Treatment
- increased irrigatione0
- Outcome
- stem diameter growthe0
- Direction
- increasede0
- Value
- 4% to 32%e0
Not reportedComparator
Verbatim
e0“Height and stem diameter growth increased 12% to 35% and 4% to 32%, respectively, with increased irrigation.”
t0“Fraser Fir”
Claim · model-written summary
Irrigation was inversely related to foliar nitrogen content.
Not reportedDirection
Verbatim
e0“There was an inverse relationship between irrigation and foliar nitrogen content”
t0“Fraser Fir”
Claim · model-written summary
Irrigation had no effect on foliar phosphorus, potassium, magnesium and manganese.
- Taxon
- Fraser Firt0
- Treatment
- irrigatione0
- Outcome
- foliar phosphorus, potassium, magnesium, and manganesee0
- Direction
- no irrigation effecte0
Not reportedComparator
Verbatim
e0“no irrigation effect on foliar phosphorus, potassium, magnesium, and manganese”
t0“Fraser Fir”
Claim · model-written summary
Irrigation increased foliar calcium.
Not reportedComparator
Verbatim
e0“Irrigation increased foliar calcium.”
t0“Fraser Fir”
Claim · model-written summary
Approximately 2.0% to 4.5% of applied nitrogen was lost through leaching.
Verbatim
e0“Approximately 2.0% to 4.5% of applied nitrogen was lost through leaching.”
t0“Fraser Fir”
Claim · model-written summary
High irrigation increased total biomass through greater root and stem biomass.
Verbatim
e0“Increases in total biomass in high irrigation treatments were caused by higher root and stem biomass.”
t0“Fraser Fir”
Claim · model-written summary
Higher irrigation increased nitrogen use efficiency and assimilatory nitrogen use efficiency.
- Taxon
- Fraser Firt0
- Treatment
- Higher irrigation treatmentse0
- Outcome
- nitrogen use efficiency (NUE) and assimilatory nitrogen use efficiencye0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“Higher irrigation treatments increased nitrogen use efficiency (NUE) and assimilatory nitrogen use efficiency”
t0“Fraser Fir”
Claim · model-written summary
Higher irrigation may raise nitrogen use efficiency through increased carbon assimilation and net primary productivity.
Verbatim
e0“probably as a result of increase in carbon assimilation efficiency leading to increase in net primary productivity.”
t0“Fraser Fir”
Claim · model-written summary
Irrigation had no clear effect on root weight ratio.
Not reportedTreatmentComparator
Verbatim
e0“There was no clear effect on the root weight ratio”
t0“Fraser Fir”
Claim · model-written summary
The lowest irrigation gave a higher index of nitrogen availability per unit foliage.
- Taxon
- Fraser Firt0
- Treatment
- lowest irrigatione0
- Outcome
- index nitrogen availability per unit of foliagee0
- Direction
- highere0
Not reportedComparator
Verbatim
e0“the index nitrogen availability per unit of foliage indicated a higher availability in plants receiving the lowest irrigation.”
t0“Fraser Fir”
Claim · model-written summary
Under water stress, nutrient supply to organs may buffer reduced assimilation and nitrogen use efficiency.
Verbatim
e0“This suggests that under water stress, the decrease in assimilation and NUE may be buffered by an increase in the plant's ability to provide nitrogen and other nutrients to various organs.”
t0“Fraser Fir”