Intervention effectmodel-written summary

Elevated CO2 did not significantly affect the average harvest index of soybean.

A claim from Effects of free air CO_2 enrichment( FACE) on growth and yield of summer soybean · 2009

Intervention effectobservedoriginal resultno effectnot significant (as stated)measured

Claim · model-written summary

Taxon: soybeanGlycine maxe0
Treatment: elevated [CO2]e2
Outcome: average harvest indexe2
Direction: wasn't significantly affectede2
Comparator: ambiente1

Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleSettingValueQualifier

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

*Glycine max* · TaxonPublic domain · Wikimedia Commons ↗

Verbatim

e0
“Elevation of [CO2] will invariably influence soybean growth and yield”
✓ located verbatim in the source · abstract, characters 105–174

e1
“The CO2 regimes investigated were ambient ((389±40)μmol·mol-1) and FACE ((550±60)μmol·mol-1)”
✓ located verbatim in the source · abstract, characters 350–442

e2
“The average harvest index wasn't significantly affected by elevated [CO2]”
✓ located verbatim in the source · abstract, characters 1358–1431

Title

Effects of free air CO_2 enrichment( FACE) on growth and yield of summer soybean

Hao Xing Acta Ecologica Sinica 2009

Other claims from this paper (14)

Intervention effect Elevated CO2 under FACE increased the weight of leaf, stem and pod compared with ambient CO2.
Intervention effect Under FACE, above-ground biomass of two varieties was significantly increased by about 52.30% compared with ambient air.
Intervention effect Elevated CO2 increased leaf area of Zhonghuang35.
Intervention effect Elevated CO2 decreased leaf area of Zhonghuang13.
Intervention effect Under FACE, specific leaf weight of two soybean cultivars increased at the filling pod stage.
Intervention effect Under FACE, specific leaf weight of Zhonghuang35 was significantly increased by 23.08%.
Intervention effect Under FACE, plant node number and branch number increased.
Intervention effect Under elevated CO2, stem diameter of Zhonghuang35 significantly increased by 7.18% at harvest.
Intervention effect Under elevated CO2, stem diameter of Zhonghuang13 significantly increased by 26.33% at harvest.
Intervention effect Under FACE, pod number per plant and individual seed mass increased, which the paper links to higher yield.
Intervention effect Under FACE, average soybean yield increased by 30.93%.
Intervention effect Elevated CO2 did not significantly change the proportional allocation of leaf, stem and pod biomass to above-ground biomass over the growing season.
Observation The effect of FACE on soybean differed significantly between the two cultivars.
Association The authors state that the yield and biomass increases under elevated CO2 are consistent with SoyFACE studies but larger in magnitude.

Record rev-e9577acef132bbfb5844508a95247799afe7482d04a82730053ea7f0df6d2b5f · schema claims-v0.9 · position 12 in the model’s answer

co2 · yield · Glycine max (soybean)Positive and negative results

96 papers: 86 positive, 10 negative or no effect

10 papers in the same direction as this claim · 85 in the opposite direction

positive
Seed yield of soybean increased by 24% at elevated CO2, still lower than the dry weight increase.
A meta‐analysis of elevated [CO₂] effects on soybean (Glycine max) physiology, growth and yield · 2002
Opposite direction
positive
Elevated CO2 increased seed yield.
Decreases in Stomatal Conductance of Soybean under Open-Air Elevation of [CO2] Are Closely Coupled with Decreases in Ecosystem Evapotranspiration · 2006
Opposite direction
positive
CO2 enrichment increased seed yield, mainly through seed number.
Response of Soybean to Air Temperature and Carbon Dioxide Concentration · 1989
Opposite direction
positive
Elevated CO2 partially offset climate extreme yield gaps, more strongly in soybean than maize.
The combined and separate impacts of climate extremes on the current and future US rainfed maize and soybean production under elevated CO₂ · 2017 · compared with maize
Opposite direction
positive
A rectangular hyperbola model predicts a 32% increase in soybean seed yield when carbon dioxide doubles from 315 to 630 ppm.
Response of vegetation to rising carbon dioxide: Photosynthesis, biomass, and seed yield of soybean · 1987
Opposite direction
positive
Seed yield increased under elevated carbon dioxide.
Response of Agronomic and Forest Species to Elevated Atmospheric Carbon Dioxide · 1983
Opposite direction
positive
soybean seed yield and biomass increased under elevated CO2.
Interaction of Elevated Ultraviolet-B Radiation and CO₂ on Productivity and Photosynthetic Characteristics in Wheat, Rice, and Soybean · 1990 · compared with control
Opposite direction
positive
Elevated CO2 (550 ppm) increased soybean aboveground net primary production by 17-18%, consistently across three seasons and two cultivars.
Smaller than predicted increase in aboveground net primary production and yield of field‐grown soybean under fully open‐air [CO₂] elevation · 2005
Opposite direction

87 papers more in this group

See all 96 papers →

Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.

Other papers on the same question

co2 · yield · Glycine max (soybean)Positive and negative results