Search claims · PlantClaims

2020s 822

Observationobservedoriginal resultmeasured

Claim · model-written summary

Males had higher photosynthetic nitrogen use efficiency.

Taxon: Populus cathayanaPopulus cathayanat0
Outcome: photosynthetic nitrogen use efficiencye1
Direction: highere1

Verbatim

t0
“Populus cathayana”
✓ located verbatim in the source · title, characters 70–87

e1
“higher nitrogen use efficiency (photosynthetic nitrogen use efficiency)”
✓ located verbatim in the source · abstract, characters 989–1060

Title

Differences in carbon and nitrogen metabolism between male and female Populus cathayana in response to deficient nitrogen

Xiaoyi Wu; Jiantong Liu; Qiqi Meng; et al. Tree Physiology 2020. doi:10.1093/treephys/tpaa108

Other claims from this paper (9)

Associationobservedoriginal resultmeasured

Claim · model-written summary

Greater nitrogen availability decreased χ and increased water-use efficiency.

Taxon: Acer saccharumAcer saccharumt0
Outcome: χe0
Direction: decreasede0
Qualifier: increased water-use efficiencye0

Not reportedTreatment

Verbatim

e0
“decreased χ (i.e, increased water-use efficiency).”
✓ located verbatim in the source · abstract, characters 1167–1217

t0
“Acer saccharum”
✓ located verbatim in the source · title, characters 105–119

Title

Increasing nitrogen availability increases water-use efficiency and decreases nitrogen-use efficiency in Acer saccharum

Evan A Perkowski; David W Frey; Christine L Goodale; et al. Tree Physiology 2025. doi:10.1093/treephys/tpaf119

Other claims from this paper (11)

Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Subsurface application improved nitrogen use efficiency.

Taxon: Murcott mandarint0
Treatment: Subsurface applicatione0
Outcome: nitrogen use efficiencye0
Direction: improvede0

Not reportedComparator

Verbatim

e0
“Subsurface application improved nitrogen use efficiency”
✓ located verbatim in the source · abstract, characters 826–881

t0
“Murcott mandarin”
✓ located verbatim in the source · title, characters 68–84

Title

The effect of different levels of subsoil nitrogen fertilization on Murcott mandarin trees

The future of Horticulture 2024. doi:10.37229/fsa.fjh.2024.11.15

Other claims from this paper (5)

2010s 684

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Intervention effectobservedoriginal resultpositivemeasured

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”
✓ located verbatim in the source · abstract, characters 670–779

t0
“Fraser Fir”
✓ located verbatim in the source · title, characters 62–72

Title

Growth, Biomass, and Nitrogen Use Efficiency of Containerized Fraser Fir (Abies fraseri) as Related to Irrigation and Nitrogen Fertilization

Pascal Nzokou; Bert M. Cregg HortScience 2010. doi:10.21273/hortsci.45.6.946

Other claims from this paper (11)

Intervention effect Height growth increased by 12% to 35% with increased irrigation.
Intervention effect Stem diameter growth increased by 4% to 32% with increased irrigation.
Association Irrigation was inversely related to foliar nitrogen content.
Intervention effect Irrigation had no effect on foliar phosphorus, potassium, magnesium and manganese.
Intervention effect Irrigation increased foliar calcium.
Observation Approximately 2.0% to 4.5% of applied nitrogen was lost through leaching.
Mechanism High irrigation increased total biomass through greater root and stem biomass.
Mechanism Higher irrigation may raise nitrogen use efficiency through increased carbon assimilation and net primary productivity.
Intervention effect Irrigation had no clear effect on root weight ratio.
Intervention effect The lowest irrigation gave a higher index of nitrogen availability per unit foliage.
Mechanism Under water stress, nutrient supply to organs may buffer reduced assimilation and nitrogen use efficiency.

Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

Nitrogen supply reduced photosynthetic nitrogen use efficiency in leaves.

Taxon: Quercus serrataQuercus serratat0
Organ / stage: leavese0
Treatment: N supplye0
Outcome: photosynthetic nitrogen use efficiencye0
Direction: reducede0

Not reportedComparator

Verbatim

e0
“Within leaves, N supply reduced the photosynthetic nitrogen use efficiency (PNUE)”
✓ located verbatim in the source · abstract, characters 904–985

t0
“Quercus serrata seedlings”
✓ located verbatim in the source · title, characters 27–52

Title

Nitrogen use efficiency of Quercus serrata seedlings under different soil nitrogen and phosphorus supplies

Benhui ZHU; Takeshi IZUTA; Makoto WATANABE Journal of Agricultural Meteorology 2019. doi:10.2480/agrmet.d-19-00032

Other claims from this paper (8)

Intervention effect Nitrogen supply reduced seedling nitrogen use efficiency.
Intervention effect Nitrogen supply decreased nitrogen productivity.
Intervention effect Nitrogen supply decreased mean residence time of nitrogen.
Intervention effect Phosphorus supply enhanced nitrogen use efficiency.
Intervention effect Phosphorus supply did not significantly change the reduction of nitrogen use efficiency with increasing nitrogen.
Intervention effect Phosphorus supply affected nitrogen productivity responses to increasing nitrogen.
Intervention effect Phosphorus supply affected mean residence time responses to increasing nitrogen.
Intervention effect Phosphorus alleviated the nitrogen-induced reduction of photosynthetic nitrogen use efficiency.

Observationobservedoriginal resultmeasured

Claim · model-written summary

Nitrogen use efficiency decreased with nitrogen level.

Taxon: Pinus wallichianaPinus wallichianat0
Treatment: increasing nitrogen levelse0
Outcome: nitrogen use efficiency (NUE)e0
Direction: decreasede0

Not reportedComparator

Verbatim

e0
“nitrogen uptake per seedling increased, whereas, nitrogen use efficiency (NUE) decreased with the increasing nitrogen levels”
✓ located verbatim in the source · abstract, characters 1122–1246

t0
“Pinus wallichiana”
✓ located verbatim in the source · title, characters 48–65

Title

Biomass allocation and nitrogen distribution of Pinus wallichiana Jackson seedlings under different nitrogen fertigation levels

Ahmad Hillal; H Masoodi T; Bashir Altamash; et al. African Journal of Agricultural Research 2013. doi:10.5897/ajar12.2244

Other claims from this paper (6)

2000s 425

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Intervention effectauthor interpretationoriginal resultmeasured

Claim · model-written summary

Nitrogen fertilization enhanced water-use efficiency at the expense of nitrogen-use efficiency.

Taxon: Avicennia marinaAvicennia marinat0
Treatment: +Ne0
Outcome: WUEe0
Direction: enhancede0
Qualifier: at the expense of NUEe0

Not reportedComparator

Verbatim

e0
“Hence, +N enhanced WUE at the expense of NUE”
✓ located verbatim in the source · abstract, characters 1156–1200

t0
“grey mangrove, Avicennia marina”
✓ located verbatim in the source · abstract, characters 94–125

Title

Nitrogen fertilization enhances water-use efficiency in a saline environment

KATHERINE C. MARTIN; DAN BRUHN; CATHERINE E. LOVELOCK; et al. Plant Cell & Environment 2009. doi:10.1111/j.1365-3040.2009.02072.x

Other claims from this paper (8)

Intervention effect Phosphorus fertilization had no significant effect on shoot growth.
Intervention effect Nitrogen fertilization enhanced canopy development, particularly in scrub trees.
Observation Scrub trees had greater water-use efficiency than fringe trees.
Observation Scrub trees had lower nitrogen-use efficiency than fringe trees.
Intervention effect Nitrogen-fertilized trees had similar CO2 assimilation rates to other treatments.
Intervention effect Nitrogen-fertilized trees achieved assimilation at lower transpiration rates, stomatal conductance and intercellular CO2 concentrations.
Observation Nitrogen-fertilized trees had greater nitrogen content per unit leaf area.
Observation Nitrogen-fertilized and scrub control trees had less negative foliar delta13C values.

Observationobservedoriginal resultmeasured

Claim · model-written summary

Genetic variation exists for mean trait expression and plasticity of water-use efficiency and nitrogen-use efficiency in lodgepole pine.

Taxon: lodgepole pinePinus contortat0
Outcome: mean trait expression as well as for plasticitye0
Qualifier: water-use efficiency and nitrogen-use efficiencye0

Verbatim

t0
“lodgepole pine”
✓ located verbatim in the source · title, characters 51–65

e0
“Genetic variation exists for mean trait expression as well as for plasticity for both water-use efficiency and nitrogen-use efficiency”
✓ located verbatim in the source · abstract, characters 1908–2042

Title

Genetic variation for resource use efficiencies in lodgepole pine

Smets, Pia cIRcle (University of British Columbia) 2009. doi:10.14288/1.0099680

Other claims from this paper (9)

Observationobservedoriginal resultpositivemeasured

Claim · model-written summary

Cedrela odorata had the highest potential nitrogen-use efficiency.

Taxon: Cedrela odorataCedrela odoratae0
Outcome: potential nitrogen-use efficiencye0
Direction: higheste0

Verbatim

e0
“Cedrela odorata had the shortest-lived leaves and the highest potential nitrogen-use efficiency”
✓ located verbatim in the source · abstract, characters 1271–1366

Title

Photosynthetic nutrient-use efficiency in three fast-growing tropical trees with differing leaf longevities

A. J. Hiremath Tree Physiology 2000. doi:10.1093/treephys/20.14.937

Other claims from this paper (8)

1990s 218

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Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Nitrogen use efficiency increased under nitrogen limitation.

Taxon: Spartium junceumSpartium junceumt0
Treatment: nitrogen limitatione0
Outcome: Nitrogen use efficiencye0
Direction: increasede0

Not reportedComparator

Verbatim

e0
“Nitrogen use efficiency increased under nitrogen limitation.”
✓ located verbatim in the source · abstract, characters 915–975

t0
“Spartium junceum”
✓ located verbatim in the source · title, characters 94–110

Title

Partitioning Growth and Photosynthesis between Leaves and Stems During Nitrogen Limitation in Spartium junceum

Erik Tallak Nilsen American Journal of Botany 1992. doi:10.2307/2445047

Other claims from this paper (11)

Intervention effect Nitrogen limitation reduced aboveground growth.
Intervention effect Nitrate limitation reduced leaf area more than stem area.
Intervention effect Supplemental ammonium increased growth.
Intervention effect Supplemental ammonium increased stem area more than leaf area.
Intervention effect Excess ammonium decreased leaf and stem growth.
Intervention effect Under nitrogen limitation stems contained more nitrogen than leaves.
Intervention effect Nitrogen limitation reduced stem assimilation.
Intervention effect Nitrogen limitation reduced leaf assimilation.
Intervention effect Stem contribution to daily carbon gain increased while that of leaves decreased.
Intervention effect Leaf contribution to daily carbon gain decreased under nitrogen limitation.
Association Stem and leaf assimilation had similar linear relationships with tissue nitrogen concentration.

Associationobservedoriginal resultmeasured

Claim · model-written summary

Intrinsic water use efficiency and photosynthetic nitrogen use efficiency were negatively correlated.

Taxon: white sprucePicea glaucat0
Compound: nitrogene0
Outcome: intrinsic water use efficiencye0
Direction: negative correlatione0

Verbatim

e0
“There was a negative correlation between intrinsic water use efficiency and photosynthetic nitrogen use efficiency (NUE).”
✓ located verbatim in the source · abstract, characters 1986–2107

t0
“white spruce”
✓ located verbatim in the source · title, characters 114–126

Title

The effects of nitrogen stress on the stable carbon isotope composition, productivity and water use efficiency of white spruce (Picea glauca (Moench) Voss) seedlings

N. J. LIVINGSTON; R. D. GUY; Z. J. SUN; et al. Plant Cell & Environment 1999. doi:10.1046/j.1365-3040.1999.00400.x

Other claims from this paper (11)

Observation Cross ranking by needle δ13C persisted across water and nitrogen treatments.
Association There was no significant genetic by environment interaction.
Association Needle δ13C correlated positively with water use efficiency.
Association Needle δ13C correlated positively with dry matter production.
Intervention effect Nitrogen stressed seedlings had the lowest needle δ13C under both water conditions.
Association Needle nitrogen content correlated positively with δ13C.
Intervention effect Lower nitrogen supply appeared to increase stomatal conductance.
Intervention effect Lower nitrogen supply appeared to lower water use efficiency.
Observation NUE varied significantly among genotypes and persisted across treatments.
Observation The authors found no detectable anaplerotic carbon fixation effect.
Method / resource Using 29‰ for net discrimination gave excellent agreement between gas exchange and δ13C C i/C a estimates.

Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Nitrogen use efficiency increased under nitrogen limitation in Spartium junceum

Taxon: Spartium junceumSpartium junceume0
Treatment: nitrogen limitatione2
Outcome: Nitrogen use efficiencye2
Direction: increasede2

Not reportedComparator

Verbatim

e0
“A clone of Spartium junceum (Spanish broom)”
✓ located verbatim in the source · abstract, characters 0–43

e2
“Nitrogen use efficiency increased under nitrogen limitation”
✓ located verbatim in the source · abstract, characters 922–981

Title

PARTITIONING GROWTH AND PHOTOSYNTHESIS BETWEEN LEAVES AND STEMS DURING NITROGEN LIMITATION IN SPARTIUM JUNCEUM

Erik Tallak Nilsen American Journal of Botany 1992. doi:10.1002/j.1537-2197.1992.tb13723.x

Other claims from this paper (9)

Intervention effect Nitrogen limitation reduced aboveground growth of Spartium junceum
Intervention effect NO3 limitation reduced leaf area more than stem area in Spartium junceum
Intervention effect Supplemental soil nitrogen from NH 4 + increased growth of Spartium junceum
Intervention effect Supplemental soil nitrogen from NH 4 + increased stem area more than leaf area
Intervention effect Excess NH 4 + decreased growth of leaves and stems of Spartium junceum
Observation Stems held a greater amount of nitrogen than leaves in Spartium junceum, particularly on a surface area basis
Intervention effect Stem and leaf assimilation were reduced under limiting nitrogen
Association Stem contribution to daily carbon gain increased compared with leaves
Association Stem and leaf assimilation had similar linear relationships with tissue nitrogen concentration

1980s 40

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Associationobservedoriginal resultmeasured

Claim · model-written summary

Nitrogen use efficiency indices declined with greater nitrogen availability.

Taxon: loblolly pinePinus taedat0
Compound: Ne0
Outcome: indices of NUEe0
Direction: decreasede0

Verbatim

e0
“indices of NUE decreased with increased N availability.”
✓ located verbatim in the source · abstract, characters 556–611

t0
“Loblolly Pine”
✓ located verbatim in the source · title, characters 53–66

Title

Nitrogen Availability and Nitrogen Use Efficiency in Loblolly Pine Stands

Elaine M. Birk; Peter M. Vitousek Ecology 1986. doi:10.2307/1938504

Other claims from this paper (10)

Intervention effectobservedoriginal resultno effectmeasured

Claim · model-written summary

Increasing nitrogen availability did not influence water use efficiency.

Taxon: Prosopis glandulosaNeltuma glandulosat0
Treatment: Increasing nitrogen availabilitye0
Outcome: water use efficiencye0
Direction: did not influencee0

Not reportedComparator

Verbatim

e0
“Increasing nitrogen availability caused increased growth rates but did not influence water use efficiency”
✓ located verbatim in the source · abstract, characters 880–985

t0
“Prosopis glandulosa”
✓ located verbatim in the source · title, characters 46–65

Title

Water Relations and Growth Characteristics of Prosopis glandulosa var. Torreyana in a Simulated Phreatophytic Environment

Erik T. Nilsen; R. A. Virginia; W. M. Jarrell American Journal of Botany 1986. doi:10.2307/2444086

Other claims from this paper (11)

Intervention effect Higher groundwater salinity lowered plant water potentials.
Intervention effect Higher groundwater salinity increased osmotic adjustment.
Intervention effect Higher groundwater salinity did not significantly increase leaf sodium concentration.
Intervention effect Leaf conductance was higher under higher salinity.
Association Low water potential was associated with reduced leaf size and leaf area per plant.
Association Low water potential was associated with increased root to shoot ratio.
Intervention effect Low water potential did not affect specific leaf weight or transpiration ratio.
Intervention effect Increasing nitrogen availability increased growth rates.
Association Net assimilation rates increased with nitrogen availability.
Association Relative growth rates depended more on plant size than treatment conditions.
Observation Responses in the simulated phreatophytic environment resembled field predictions.

Intervention effectobservedoriginal resultno effectmeasured

Claim · model-written summary

Increasing nitrogen availability did not influence water use efficiency.

Taxon: PROSOPIS GLANDULOSA VAR. TORREYANANeltuma odoratat0
Treatment: Increasing nitrogen availabilitye0
Outcome: water use efficiencye0
Direction: did not influencee0

Not reportedComparator

Verbatim

e0
“Increasing nitrogen availability caused increased growth rates but did not influence water use efficiency.”
✓ located verbatim in the source · abstract, characters 881–987

t0
“PROSOPIS GLANDULOSA VAR. TORREYANA”
✓ located verbatim in the source · title, characters 46–80

Title

WATER RELATIONS AND GROWTH CHARACTERISTICS OF PROSOPIS GLANDULOSA VAR. TORREYANA IN A SIMULATED PHREATOPHYTIC ENVIRONMENT

Erik T. Nilsen; R. A. Virginia; W. M. Jarrell American Journal of Botany 1986. doi:10.1002/j.1537-2197.1986.tb12056.x

Other claims from this paper (13)

Intervention effect Increased groundwater salinity lowered plant water potentials.
Intervention effect Increased groundwater salinity increased osmotic adjustment.
Intervention effect Increased groundwater salinity did not significantly increase leaf sodium concentration.
Intervention effect Leaf conductance was higher with higher salinity.
Association Low water potential was associated with reduced leaf size.
Association Low water potential was associated with reduced leaf area per plant.
Association Low water potential was associated with increased root to shoot ratio.
Intervention effect Specific leaf weight was unaffected by low water potential induced by salinity.
Intervention effect transpiration ratio was unaffected by low water potential induced by salinity.
Intervention effect Increasing nitrogen availability increased growth rates.
Intervention effect Net assimilation rates increased with nitrogen availability.
Association Relative growth rates depended more on plant size than treatment conditions.
Observation Plant responses in the simulated phreatophytic environment were similar to field predictions.

1970s 21

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Associationobservedoriginal resultmeasured

Claim · model-written summary

Emergent species had higher nitrogen content and nonsignificantly higher nitrogen use efficiency than underlayer species.

Taxon: A. excelsaLiquidambar excelsae0
Outcome: nitrogen contente0
Direction: highere0
Comparator: underlayer speciese0

Verbatim

e0
“The emergent species (A. excelsa and Q. lineata)have higher nitrogen content than the underlayer species (G. rostrata and E. lineata).”
✓ located verbatim in the source · abstract, characters 1310–1444

e1
“Although not significant, emergen species have higher NUE than underlayer species”
✓ located verbatim in the source · abstract, characters 1582–1663

Title

Nitrogen–use efficiency in different vegetation type at Cikaniki Research Station, Halimun-Salak Mountain National Park, West Java

SUHARNO SUHARNO; IMAM MAWARDI; SETIABUDI SETIABUDI; et al. Biodiversitas Journal of Biological Diversity 1970. doi:10.13057/biodiv/d080409

Other claims from this paper (19)

Observation The surveyed vegetation contained 61 trees from 24 species.
Observation Altingia excelsa had the highest reported importance value.
Observation Castanopsis javanica had an importance value of 39,698.
Observation Platea latifolia had an importance value of 27,684.
Observation Garcinia rostrata had an importance value of 21,151.
Observation Schima walichii had an importance value of 16,049.
Observation Eugenia lineata had a lower importance value of 13,967.
Observation Melanochyla caesa had a lower importance value of 12,241.
Observation Quercus lineata had a lower importance value of 10,766.
Observation platea excelsa had a lower importance value of 10,766.
Observation Other trees had importance values below 10.
Observation Quercus lineata had the highest reported specific leaf area, 0,01153.
Observation G. rostrata specific leaf area was 0,00821.
Observation A. excelsa specific leaf area was 0,00579.
Observation E. lineata specific leaf area was reported as 0,00984 g/cm2.
Observation A. excelsa had the highest stomatal count, 85,10/mm2.
Observation E. lineata had a stomatal count of 74,40/mm2.
Observation Q. lineata had a stomatal count of 53,70/mm2.
Observation G. rostrata had a stomatal count of 18,4 /mm2.

Intervention effectobservedoriginal resultno effectmeasured

Claim · model-written summary

Additional nitrogen did not prevent the seasonal decline in apparent efficiency of incident-light use.

Taxon: appleMalus domesticat0
Treatment: Additional nitrogene0
Outcome: apparent efficiency of utilization of incident light energye0
Direction: did not prevent a seasonal declinee0

Not reportedComparator

Verbatim

e0
“Additional nitrogen, however, did not prevent a seasonal decline in the apparent efficiency of utilization of incident light energy.”
✓ located verbatim in the source · abstract, characters 787–919

t0
“apple”
✓ located after whitespace/quote normalisation · title, characters 23–28

Title

The Responses of Young Apple Trees to Supplementary Nitrogen and their Relation to Carbohydrate Resources

C. A. PRIESTLEY Annals of Botany 1972. doi:10.1093/oxfordjournals.aob.a084609

Other claims from this paper (7)

Intervention effect Autumn nitrogen had small effects in the current year.
Intervention effect Summer nitrogen markedly stimulated shoot growth.
Intervention effect Summer nitrogen increased leaf-area duration.
Intervention effect Nitrogen treatments did not reduce total root growth.
Intervention effect Nitrogen treatments had no direct effect on relative carbohydrate content.
Association When extra nitrogen stimulated shoot growth, a smaller fraction of photosynthate went to root growth.
Association When growth increased, dry-matter production per intercepted light energy was greater or more efficient.

Observationobservedoriginal resultmeasured

Claim · model-written summary

Other trees had importance values below 10.

Taxon: treese0
Outcome: important valuee0
Value: less than 10e0

Verbatim

e0
“Other trees have important value less than 10”
✓ located verbatim in the source · abstract, characters 817–862

Title

Nitrogen–use efficiency in different vegetation type at Cikaniki Research Station, Halimun-Salak Mountain National Park, West Java

SUHARNO SUHARNO; IMAM MAWARDI; SETIABUDI SETIABUDI; et al. Biodiversitas Journal of Biological Diversity 1970. doi:10.13057/biodiv/d080409

Other claims from this paper (19)

Observation The surveyed vegetation contained 61 trees from 24 species.
Observation Altingia excelsa had the highest reported importance value.
Observation Castanopsis javanica had an importance value of 39,698.
Observation Platea latifolia had an importance value of 27,684.
Observation Garcinia rostrata had an importance value of 21,151.
Observation Schima walichii had an importance value of 16,049.
Observation Eugenia lineata had a lower importance value of 13,967.
Observation Melanochyla caesa had a lower importance value of 12,241.
Observation Quercus lineata had a lower importance value of 10,766.
Observation platea excelsa had a lower importance value of 10,766.
Observation Quercus lineata had the highest reported specific leaf area, 0,01153.
Observation G. rostrata specific leaf area was 0,00821.
Observation A. excelsa specific leaf area was 0,00579.
Observation E. lineata specific leaf area was reported as 0,00984 g/cm2.
Observation A. excelsa had the highest stomatal count, 85,10/mm2.
Observation E. lineata had a stomatal count of 74,40/mm2.
Observation Q. lineata had a stomatal count of 53,70/mm2.
Observation G. rostrata had a stomatal count of 18,4 /mm2.
Association Emergent species had higher nitrogen content and nonsignificantly higher nitrogen use efficiency than underlayer species.

1960s 1

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Observationobservedoriginal resultmeasured

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

Verbatim

t0
“Response of Bitterbrush Seedlings to Nitrogen and Moisture on a Granitic Soil”
✓ located verbatim in the source · title, characters 0–77

e3
“Shoot‐root ratios and efficiency of water use by bitterbrush differed with respect to N and soil layer treatments”
✓ located verbatim in the source · abstract, characters 849–962

Title

Response of Bitterbrush Seedlings to Nitrogen and Moisture on a Granitic Soil

J. O. Klemmedson; R. B. Ferguson Soil Science Society of America Journal 1969. doi:10.2136/sssaj1969.03615995003300060044x

Other claims from this paper (8)

Intervention effect Shoot and root weights were greater in surface-soil seedlings without added N than in seedlings from lower soil layers.
Intervention effect Added N reduced seedling yields on surface soils.
Intervention effect Added N increased seedling yields on the 40-90 cm soil layer.
Intervention effect A high moisture regime diminished the adverse effects of added N on seedlings grown in surface-layer soil.
Intervention effect A high moisture regime improved the effectiveness of added N on seedlings in lower-layer soils.
Observation Six granitic soils were deficient in nitrogen for barley.
Intervention effect Bitterbrush responded negatively or not at all to added N on the same soils.
Association Bitterbrush yields declined when plant N reached about 2.0 percent.

“nitrogen use efficiency”

Claim types

Direction of the findings

Over time

Claim type

Research area

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Statistics

2020s 822

2010s 684

2000s 425

1990s 218

1980s 40

1970s 21

1960s 1