%0 Journal Article %T Covariate Measurements for Increasing the Precision of Plant Response to O3 and SO2 %A Ormrod, D. P. %A Tingey, D. T. %A Gumpertz, M. %A , %J HortScience %@ 0018-5345 %D 1983-12-01 %I American Society for Horticultural Science %~ DeepDyve