Abstract
Kentucky bluegrass (Poa pratensis L.) plants, cultivars Cheri, Merion and Touchdown were grown at complete nutrition or with low S or low N. Plants were exposed to 10 ppm (v/v) O3 for 6 h d−i, 15 pphm SO2 continuously, 15 pphm NO2 continuously, or their mixture at these concentrations for 10 days. The severity of injury was much increased by misting with deionized water for 5 min twice daily, especially with SO2 and NO2 single gas exposures. The misting did not have consistent effects on total S, total N, leaf area or fresh weight. Exposure to O3 decreased leaf area without affecting S or N content, while SO2 usually increased total S and, in some cases, increased total N. Exposure to NO2 increased total N without affecting total S, and the mixture increased both total S and total N. Low S or low N usually enhanced the effect of SO2 or NO2, respectively. Leaf area and fresh weight were not as responsive to the treatments as total S and total N. Rainfall outdoors may be a major meteorological factor affecting plant injury response to gaseous pollutants.
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Elkiey, T., Ormrod, D.P. Sulphur and nitrogen nutrition and misting effects on the response of bluegrass to ozone, sulphur dioxide, nitrogen dioxide or their mixture. Water Air Soil Pollut 16, 177–186 (1981). https://doi.org/10.1007/BF01046853
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DOI: https://doi.org/10.1007/BF01046853