Phosphorus stress effects on growth and seed yield responses of nonnodulated soybean to elevated carbon dioxide
- Duke Univ., Durham, NC (USA)
- North Carolina State Univ., Raleigh (USA)
The influence of P availability on plant responses to elevated atmospheric CO{sub 2} concentrations has received limited research attention. Therefore, an experiment was conducted to examine the effect of a wide range of P availabilities on plant response to enriched atmospheric CO{sub 2}. Nonnodulating soybean (Glycine max (L.) Merr., Lee) plants were grown from germination to maturity in controlled environment chambers at 350 or 700 {mu}L L{sup {minus}1} CO{sub 2}, respectively. Growth and yield were significantly increased by CO{sub 2} enrichment at all except the lowest P concentration. The stimulation of growth at high CO{sub 2} was consistently associated with increased leaf area, net assimilation rate, P uptake, and P utilization efficiency in the production of dry matter. When averaged over the four highest P levels, total root mass was increased 63% by CO{sub 2} enrichment, but P uptake efficiency per unit root mass was decreased 22%. The yield enhancement of 23 to 57% at high CO{sub 2} was associated with increases in the number and size of seed. Carbon dioxide enrichment had no significant effect on harvest index. The results indicate that CO{sub 2} enrichment can result in stimulation of growth and yield of nonnodulated, NO{sub 3}{sup {minus}}-fed soybean plants, even at concentrations of P that limit plant growth at ambient CO{sub 2} concentrations.
- OSTI ID:
- 5923288
- Journal Information:
- Agronomy Journal; (USA), Vol. 80:6; ISSN 0002-1962
- Country of Publication:
- United States
- Language:
- English
Similar Records
Response of soybean to air temperature and carbon dioxide concentration
Influence of daily carbon dioxide exposure duration and root environment on soybean response to elevated carbon dioxide
Related Subjects
54 ENVIRONMENTAL SCIENCES
CARBON DIOXIDE
BIOCHEMICAL REACTION KINETICS
PHOSPHORUS
BIOLOGICAL EFFECTS
UPTAKE
GLYCINE HISPIDA
NITROGEN
PLANT GROWTH
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
ELEMENTS
GROWTH
KINETICS
LEGUMINOSAE
MAGNOLIOPHYTA
MAGNOLIOPSIDA
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PLANTS
REACTION KINETICS
550200* - Biochemistry
540110