Cotton-yield responses to ozone as mediated by soil moisture and evapotranspiration

Technical Report · Tue Jan 01 04:00:00 EST 1985

OSTI ID:5313801

Temple, P J; Taylor, O C; Benoit, L F

Cotton (Gossypium hirsutum L. cv. 'SJ-2'), grown in open-top chambers in the Central Valley of California, was exposed to 6 ozone (O/sub 3/) treatments ranging from charcoal-filtered (CF) to ambient plus 0.10 ppm O/sub 3/ (1981) or twice ambient O/sub 3/ concentrations (1982) for the entire growing seasons of 1981 and 1982. Half the plots were irrigated optimally and the other half were water-stressed by providing 25% (1981) or 20% (1982) less irrigation water. During the typically hot, dry growing season of 1981, cotton yield in normally irrigated (NI) treatments was reduced 20% in non-filtered (NF) chambers relative to CF controls. Doubling ambient O/sub 3/ concentration reduced yield 45%. Water-stressed (WS) plants showed almost no response to O/sub 3/. In 1982, potential evapotranspiration during the growing season averaged 20% less and ambient O/sub 3/ concentration averaged 39% lower than in 1981. Under these growing conditions, cotton yields in NI and WS treatments responded similarly to O/sub 3/. Yields in NF chambers were reduced 15% relative to CF chambers. Doubling ambient O/sub 3/ concentrations reduced yields 65%. The greater relative response of cotton to O/sub 3/ in 1982 may have resulted from the cooler more humid growing conditions, which increased the susceptibility of cotton to O/sub 3/.

• Research Organization: California Univ., Riverside (USA). Statewide Air Pollution Research Center
• OSTI ID: 5313801
• Report Number(s): PB-88-170170/XAB
• 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.
AIR POLLUTION
BIOLOGICAL EFFECTS
COTTON PLANTS
ENVIRONMENTAL IMPACTS
OZONE
PLANTS
POLLUTION