Studies on the Effect of Sulphur Dioxide on Perennial Ryegrass (Lolium perenneL.): I. CHARACTERISTICS OF FUMIGATION SYSTEM AND PRELIMINARY EXPERIMENTS

The characteristics of a wind tunnel fumigation system in whichplants can be exposed to air pollutants under controlled conditionsover prolonged time periods and at near ambient wind speedsare described. Preliminary experiments exposing perennial ryegrass(Lolium perenne L.) to 650, 700, and 2600 µg SO₂ m^–3showed (i) the consistency of performance of the system and(ii) the lack of correlation in relative response of individualclones to acute and chronic fumigation. The results obtainedare compared with those of other research groups.