Abstract
Abstract Greenhouse studies were conducted to explore the influence of nitrogen and moisture on seedlings of bitterbrush ( Purshia tridentata [Pursh] DC.), when grown in soil from three different layers. Seedlings were grown in pots in granitic soil collected from 0–15‐, 15–40‐, and 40–90‐cm soil layers with three nitrogen (N) treatments (0, 34, and 100 kg/ha) and low and high moisture regimes. Shoot and root weights of seedlings grown in surface soils without added N greatly exceeded those for seedlings grown in soil from lower layers. Added N caused seedling yields to decline on surface soils but to increase on the 40–90‐cm soil layer. Maintenance of a high moisture regime diminished the adverse effects of added N on seedlings grown in soil from the surface layer, but improved its effectiveness on seedlings grown in lower layer soils. Shoot‐root ratios and efficiency of water use by bitterbrush differed with respect to N and soil layer treatments. In subsequent experiments, six granitic soils (including the previously tested soil) proved deficient in N for barley. However, on the same soils, bitter‐brush responded negatively or gave no response to added N. The experiments showed that yields of bitterbrush declined when N in plants reached about 2.0%.
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Claims 9
Claim · model-written summary
Shoot and root weights were greater in surface-soil seedlings without added N than in seedlings from lower soil layers.
- Taxon
- Bitterbrush
Purshia tridentatat0 - Treatment
- surface soils without added Ne0
- Outcome
- Shoot and root weightse0
- Direction
- exceedede0
- Comparator
- lower layerse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Response of Bitterbrush Seedlings to Nitrogen and Moisture on a Granitic Soil”
e0“Shoot and root weights of seedlings grown in surface soils without added N greatly exceeded those for seedlings grown in soil from lower layers”
Claim · model-written summary
Added N reduced seedling yields on surface soils.
- Taxon
- BitterbrushPurshia tridentatat0
- Treatment
- Added Ne1
- Outcome
- seedling yieldse1
- Direction
- declinee1
- Setting
- surface soilse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Response of Bitterbrush Seedlings to Nitrogen and Moisture on a Granitic Soil”
e1“Added N caused seedling yields to decline on surface soils but to increase on the 40–90‐cm soil layer”
Claim · model-written summary
Added N increased seedling yields on the 40-90 cm soil layer.
- Taxon
- BitterbrushPurshia tridentatat0
- Treatment
- Added Ne1
- Outcome
- seedling yieldse1
- Direction
- increasee1
- Setting
- 40–90‐cm soil layere1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Response of Bitterbrush Seedlings to Nitrogen and Moisture on a Granitic Soil”
e1“Added N caused seedling yields to decline on surface soils but to increase on the 40–90‐cm soil layer”
Claim · model-written summary
A high moisture regime diminished the adverse effects of added N on seedlings grown in surface-layer soil.
- Taxon
- BitterbrushPurshia tridentatat0
- Treatment
- high moisture regimee2
- Outcome
- adverse effects of added Ne2
- Direction
- diminishede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Response of Bitterbrush Seedlings to Nitrogen and Moisture on a Granitic Soil”
e2“Maintenance of a high moisture regime diminished the adverse effects of added N on seedlings grown in soil from the surface layer”
Claim · model-written summary
A high moisture regime improved the effectiveness of added N on seedlings in lower-layer soils.
- Taxon
- BitterbrushPurshia tridentatat0
- Treatment
- high moisture regimee2
- Outcome
- effectivenesse2
- Direction
- improvede2
- Qualifier
- on seedlings grown in lower layer soilse2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Response of Bitterbrush Seedlings to Nitrogen and Moisture on a Granitic Soil”
e2“Maintenance of a high moisture regime diminished the adverse effects of added N on seedlings grown in soil from the surface layer, but improved its effectiveness on seedlings grown in lower layer soils”
Claim · model-written summary
Shoot-root ratios and efficiency of water use of bitterbrush differed with nitrogen and soil layer treatments.
- Taxon
- BitterbrushPurshia tridentatat0
- Treatment
- N and soil layer treatmentse3
- Outcome
- Shoot‐root ratios and efficiency of water usee3
- Direction
- differede3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Response of Bitterbrush Seedlings to Nitrogen and Moisture on a Granitic Soil”
e3“Shoot‐root ratios and efficiency of water use by bitterbrush differed with respect to N and soil layer treatments”
Claim · model-written summary
Six granitic soils were deficient in nitrogen for barley.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaree4 - Outcome
- deficient in Ne4
- Setting
- granitic soilse4
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
t0“Response of Bitterbrush Seedlings to Nitrogen and Moisture on a Granitic Soil”
e4“six granitic soils (including the previously tested soil) proved deficient in N for barley”
Claim · model-written summary
Bitterbrush responded negatively or not at all to added N on the same soils.
- Taxon
- BitterbrushPurshia tridentatat0
- Treatment
- added Ne5
- Outcome
- responsee5
- Direction
- negativelye5
- Setting
- same soilse5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Response of Bitterbrush Seedlings to Nitrogen and Moisture on a Granitic Soil”
e5“on the same soils, bitter‐brush responded negatively or gave no response to added N”
Claim · model-written summary
Bitterbrush yields declined when plant N reached about 2.0 percent.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Response of Bitterbrush Seedlings to Nitrogen and Moisture on a Granitic Soil”
e6“yields of bitterbrush declined when N in plants reached about 2.0%”