Abstract
Abstract Rooted stem cuttings of ‘Green Giant’ arborvitae ( Thuja L. x ‘Green Giant’) were grown in 3.8 liter (#1) plastic containers containing a pine bark: sand (8:1 by vol) substrate. Plants were fertilized three times weekly for 15 weeks with a complete nutrient solution at N application rates (NARs) of 0, 10, 20, 40, 80, 160, or 320 mg/liter (ppm) supplied as ammonium nitrate (NH 4 NO 3 ). Both shoot and root dry weights were significantly affected by NAR. Maximum shoot weight, as predicted by a quadratic plateau model, was reached at a NAR of approximately 100 mg/liter (ppm), representing a 200% increase over controls [0 mg/liter (ppm) N]. Maximum and minimum root dry weights occurred at 0 mg/liter (ppm) N and approximately 50 mg/liter (ppm) N, respectively, representing a 37% decrease. Root length decreased 36% at a NAR of approximately 50 mg/liter (ppm). Root diameter (root area ÷ root length) increased before reaching a plateau at approximately 130 mg/liter (ppm) N indicating that root length decreased faster than root area at low N concentrations. Shoot concentrations of N, P, Mg, and S were maximized at approximately 71,41,48, and 52 mg/liter (ppm) N, respectively. Uptake of K and Ca were unaffected by N concentrations.
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Claims 13
Claim · model-written summary
Shoot dry weight responded significantly to nitrogen rate.
Not reportedTreatmentDirection
Verbatim
e0“Both shoot and root dry weights were significantly affected by NAR.”
t0“Thuja x ‘Green Giant’”
Claim · model-written summary
Root dry weight responded significantly to nitrogen rate.
Not reportedTreatmentDirection
Verbatim
e0“Both shoot and root dry weights were significantly affected by NAR.”
t0“Thuja x ‘Green Giant’”
Claim · model-written summary
Predicted maximum shoot weight at about 100 mg/liter N was 200% above controls.
Verbatim
e0“Maximum shoot weight, as predicted by a quadratic plateau model, was reached at a NAR of approximately 100 mg/liter (ppm), representing a 200% increase over controls [0 mg/liter (ppm) N].”
t0“Thuja x ‘Green Giant’”
Claim · model-written summary
Root dry weight fell 37% from its maximum at zero N to its minimum around 50 mg/liter N.
Verbatim
e0“Maximum and minimum root dry weights occurred at 0 mg/liter (ppm) N and approximately 50 mg/liter (ppm) N, respectively, representing a 37% decrease.”
t0“Thuja x ‘Green Giant’”
Claim · model-written summary
Root length decreased 36% around 50 mg/liter N.
Verbatim
e0“Root length decreased 36% at a NAR of approximately 50 mg/liter (ppm).”
t0“Thuja x ‘Green Giant’”
Claim · model-written summary
Root diameter increased to a plateau around 130 mg/liter N.
Verbatim
e0“Root diameter (root area ÷ root length) increased before reaching a plateau at approximately 130 mg/liter (ppm) N indicating that root length decreased faster than root area at low N concentrations.”
t0“Thuja x ‘Green Giant’”
Claim · model-written summary
At low N concentrations root length declined faster than root area.
Verbatim
e0“root length decreased faster than root area at low N concentrations”
t0“Thuja x ‘Green Giant’”
Claim · model-written summary
Shoot N concentration peaked around 71 mg/liter N.
Verbatim
e0“Shoot concentrations of N, P, Mg, and S were maximized at approximately 71,41,48, and 52 mg/liter (ppm) N, respectively.”
t0“Thuja x ‘Green Giant’”
Claim · model-written summary
Shoot P concentration peaked around 41 mg/liter N.
Verbatim
e0“Shoot concentrations of N, P, Mg, and S were maximized at approximately 71,41,48, and 52 mg/liter (ppm) N, respectively.”
t0“Thuja x ‘Green Giant’”
Claim · model-written summary
Shoot Mg concentration peaked around 48 mg/liter N.
Verbatim
e0“Shoot concentrations of N, P, Mg, and S were maximized at approximately 71,41,48, and 52 mg/liter (ppm) N, respectively.”
t0“Thuja x ‘Green Giant’”
Claim · model-written summary
Shoot S concentration peaked around 52 mg/liter N.
Verbatim
e0“Shoot concentrations of N, P, Mg, and S were maximized at approximately 71,41,48, and 52 mg/liter (ppm) N, respectively.”
t0“Thuja x ‘Green Giant’”
Claim · model-written summary
K uptake was unaffected by N concentration.
Verbatim
e0“Uptake of K and Ca were unaffected by N concentrations.”
t0“Thuja x ‘Green Giant’”
Claim · model-written summary
Ca uptake was unaffected by N concentration.
Verbatim
e0“Uptake of K and Ca were unaffected by N concentrations.”
t0“Thuja x ‘Green Giant’”