Neutralization of Phytotoxicity of Burned Rock of Coal Mines’ Dumps by Fly Ash From TPP and Potassium Humate

Abstract

Studied effect of coal fly ash from Dobrotvir TPP and potassium humate «GKV-45» on phytotoxicity of burned rock from coal mines dumps of Chervonograd mining region. For biotesting used Sudan grass Sorghum bicolor subsp. drummondii (Nees ex Steud.). Observed magnification of leaves area, length and mass of roots with reduction of stem height by addition of humate to the substrate of burned rock. Application only of the fly ash did not cause significant effect on studied morphometric parameters. But in option with presence of fly ash in substrate observed strengthening of stimulation effect of humate on the mass of roots and leaves area. Found that application of fly ash increase content of chlorophyll a and simultaneously decrease content of pheophytin a in the leaves of Sudan grass. Addition of humate caused increasing content of chlorophyll a and reducing content of pheophytin a. Application of fly ash with humate increased content of chlorophyll a and reduced content of pheophytin a more effective than addition only fly ash. Increasing of leaves and roots sizes, increasing content of chlorophyll a coupled with decreasing of stem height, content of pheophytin a indicates reducing of stress effect on plants. Noticed that application of coal fly ash with potassium humate neutralize phytotoxicity of rock from coal mines' dumps more effective than application only fly ash.