Rice (Oryza sativa. L) being a silicicolus plant absorbs Si in the form of mono silicic acid (H4 Si O4) through active aerobic respiration and accumulates several fold greater than those of other macronutrients from the growing medium which leads to drastic Si depletion on intensive rice cultivation. Investigations carried out in Cauvery Delta Zone revealed that 62 per cent of area is low in available Si and 30.5 percent area as low in available K . Hence there is an imperative need to utilize existing resources as the best substitute of Si. Thermal power stations in India produces large...