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Crop Effects from Air Pollutants in Air Exclusion Systems vs. Field Chambers¹

ABSTRACT

Crop growth and yield effects from exposure to ambient O₃ were evaluated with air exclusion systems and open-top or closed-top field chambers. Alfalfa (Medicago sativa L.) studies with three harvests in 1983 and three in 1984 indicated that during the summer growing season, plants respond similarly to ambient O₃ when exposed in air exclusion systems and inboth open- and closed-top chambers. Filtering ambient O₃ in general increased plant growth in both air exclusion systems and chambers. Plant growth was most similar between nonfiltered air exclusion systems chambers and outside plots, somewhat altered in opentop chambers, and greater in closed-top chambers than the other facilities. During the fall, alfalfa growth was similar in air exclusion systems and outside plots, whereas growth was greater in open-top chambers than in outside plots.

Key Words: alfalfa • Medicago sativa L. • O₃

¹ Contribution from the Statewide Air Pollution Research Center, Univ. of California, Riverside, CA 92521. Research supported in part by the Electric Power Research Institute under Contract NP 1908-3, and inpart by the California Air Resources Board under Contract A2-116-33. Mention of a product does not constitute a guarantee or warranty by the Univ. of California, the Electric Power Research Institute, or the California Air Resources Board, and does not imply endorsement of it to the exclusion of other products.

² Assistant Research Plant Physiologist, Assistant Research Plant Chemist, Staff Research Associate, Staff Research Associate, Laboratory Assistant, and Research Biochemist, Statewide Air Pollution Research Center, Univ. of California, Riverside, CA, respectively.

Received for publication September 30, 1985.