Sulphur and nitrogen nutrition and misting effects on the response of bluegrass to ozone, sulphur dioxide, nitrogen dioxide or their mixture
1981
Elkiey, T. | Ormrod, D.P. (Guelph Univ., Ontario (Canada). Dept. of Horticultural Science)
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) O(,3) for 6 h/d, 15 pphm SO(,2) continuously, 15 pphm NO(,2) 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 SO(,2) and NO(,2) single gas exposures. The misting did not have consistent effects on total S, total N, leaf area or fresh weight. Exposure to O (,3) decreased leaf area without affecting S or N content, while SO(,2) usually increased total S and, in some cases, increased total N. Exposure to NO(,2) 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 SO(,2) or NO(,2), 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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