摘要：Fly ash is a major particulate type of air pollutant affected the opening and closing of stomata by blocking the stomatal aperture and thereby allowed increased transpiration. Low dusting rate of fly ash increased chlorophyll contents significantly, while high dusting rate of fly ash reduced the chlorophyllase enzyme due to the alkalinity caused by excessive soluble salts on the leaf surface and also due to increase of foliar temperature which retarted chlorophylls or breakdown of chlorophyll to form pheophytin. Due to which photosynthesis in leaves also retarded. In present lower dose of fly ash dust was found beneficial for all plant growth (Length, fresh and dry weight of shoot and root and tillers no. leaf area); yield (Ear length, no. of grains/ear and weight of 100 grains) compared to control .While, both another doses (2.5 and 5.0 g m-2) caused reduction in all above parameters and reduction were higher in 5.0 g m-2 treatments. Similarly, all biochemicals (Photosynthetic pigments, seed protein and seed carbohydrates) were also increased at 1.25 g m-2 treated sets. Lower dose of fly ash was also found beneficial to all leaf epidermal characteristics (No. of adaxial and abaxial surface of stomata, length and width of stomatal aperture and no. and length of trichomes). All these parameters were increased significantly. After that there was gradual decrease in all these parameters at both doses (2.5 and 5.0 g m-2).
