Cogen ash, a by-product of sugar mills obtained during co-generation process to produce heat and electrical energy by burning bagasse and/or coal was used to study its effect on growth and yield of paddy. The experiment was conducted in two sites at Bharathinagar, K.M. Doddi, Mandya during kharif 2014 with 13 treatments replicated thrice using randomized complete block design. The cogen ash collected from M/s Sri Chamundeshwari Sugars Ltd. was used in the study was more of silt sized, alkaline in nature with medium EC. Cogen ash was applied at different levels along with recommended doses of fertilizers and different levels of FYM. Cogen ash contains some amount of plant nutrients (K, Ca, Mg and micro nutrients) which can be taken up by the plants directly or indirectly for their growth and production. It was found that on application of recommended doses of fertilizers with 100 % recommended doses of FYM and 15 t ha-1 of cogen ash significantly increased grain yield and straw yield to an extent of 46.92 % and 33.54 %, respectively.

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