Forage Quality of Western Wheatgrass Exposed to Sulfur Dioxide

Abstract
Effects of 3 exposure levels of SO2 (55, 100 and 170 .mu.g/m3) on the nutritive value of western wheatgrass were investigated. Significant increases in plant S content were observed, both with time and level of SO2 exposure. Plant ash content paralleled the trends observed for S concentrations. N concentrations in western wheatgrass were not affected by SO2 treatments. The increased plant S content and decreased N:S ratios across treatments did not significantly affect forage digestibility as measured by in vitro digestible dry matter.