Interacting effects of CO/sub 2/ and nutrient concentration. [Glycine max; Cassia obtusifolia; Crotalaria spectabilis]

Journal Article · Thu Jul 01 04:00:00 EDT 1982 · Weed Sci.; (United States)

OSTI ID:6847992

Patterson, D T; Flint, E P

Soybean (Glycine max (L.) Merr. Tracy) and two associated weeds, sicklepod (Cassia obtusifolia L.) and showy crotalaria (Crotalaria spectabilis Roth), were grown in controlled-environment chambers with day/night temperatures of 29/23 C, photosynthetic photon flux density (PPFD) of 600 ..mu..E m/sup -2/ s/sup -1/, CO/sub 2/ concentrations of 350 or 675 ppm, and one-eighth or one-half strength Hoagland's nutrient solution applied three times daily. Leaf areas and dry weights of plant parts were determined at 1, 3, and 5 weeks. Stomatal resistances, transpiration rates, leaf water potentials, and leaf chlorophyll contents were measured, and net assimilation rates (NAR) and leaf area durations (LAD) were calculated. In all species, growth in 675 ppm CO/sub 2/ enhanced dry-matter production through increases in both NAR and LAD. The increased dry-matter production with one-half strength compared to one-eighth strength Hoagland's solution was, however, caused by increased LAD. Stomatal conductances and transpiration rates decreased in 675 ppm CO/sub 2/, but were not affected by nutrient level. High CO/sub 2/ concentration or low nutrient level generally decreased leaf chlorophyll content per unit area. Growth enhancement by high CO/sub 2/ was greater in one-half strength than in one-eighth strength Hoagland's solution. 18 references, 5 figures.

• Research Organization: Dept. of Agriculture, Stoneville, MS
• OSTI ID: 6847992
• Journal Information: Weed Sci.; (United States), Journal Name: Weed Sci.; (United States) Vol. 30:4; ISSN WEESA
• Country of Publication: United States
• Language: English

Related Subjects

500200* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
560300 -- Chemicals Metabolism & Toxicology
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ATMOSPHERES
BACTERIA
BIOLOGICAL EFFECTS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CARBOXYLIC ACIDS
CHALCOGENIDES
CHEMICAL REACTIONS
CHLOROPHYLL
CONTROLLED ATMOSPHERES
DATA
ECOLOGICAL CONCENTRATION
EXPERIMENTAL DATA
GLYCINE HISPIDA
GROWTH
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
INFORMATION
LEGUMINOSAE
MICROORGANISMS
NUMERICAL DATA
NUTRIENTS
OPENINGS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PHYTOCHROMES
PIGMENTS
PLANT GROWTH
PLANTS
PORPHYRINS
PROTEINS
RHIZOBIUM
STOMATA
SYNTHESIS
TRANSPIRATION
UPTAKE
WEEDS