Effects of long-term ozone exposure and soil-moisture deficit on growth of a ladino clover-tall fescue pasture

Technical Report · Fri Jan 01 00:00:00 EST 1988

OSTI ID:7011735

Heagle, A S; Rebbeck, J; Shafer, S R; Blum, U; Heck, W W

Most field studies relating seasonal ozone (O3) exposure to crop yield have been performed in the absence of plant moisture stress. The authors examined the response of a mixture of ladino clover and tall fescue to chronic doses of O3 at two soil-moisture levels over two growing seasons. The soil-moisture treatments, obtained by differential irrigation, were well-watered or water-stressed. A soil-moisture deficit occurred intermittently in water-stressed plots during both seasons. Shoots were harvested when plants reached a height of 20-25 cm. Total forage yield in the water stressed plots was 12-14% less than that in the well-watered plots. Clover was much more sensitive than fescue to O3. The decrease in total forage yield and decreased quality caused by decreased growth of clover suggest a need for ladino clover lines that are tolerant to O3.

• Research Organization: Environmental Protection Agency, Corvallis, OR (USA). Environmental Research Lab.
• OSTI ID: 7011735
• Report Number(s): PB-90-216375/XAB; EPA-600/J-88/512
• Resource Relation: Other Information: Pub. in Phytopathology, Vol. 79, No. 2, 128-136(1988)
• Country of Publication: United States
• Language: English

Related Subjects

63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
CLOVER
PLANT GROWTH
GRASS
OZONE
TOXICITY
AIR POLLUTION
FORAGE
IRRIGATION
MOISTURE
SEASONAL VARIATIONS
ANIMAL FEEDS
FOOD
GROWTH
LEGUMINOSAE
LILIOPSIDA
MAGNOLIOPHYTA
MAGNOLIOPSIDA
PLANTS
POLLUTION
VARIATIONS
560300* - Chemicals Metabolism & Toxicology