A field experiment was conducted at the Ugar Sugar Factory premises, Ugar-Khurd, Athani taluk, Belagavi district to study the effect of different periods of bio-methanated spentwash application on sugarcane crop under Northern Dry Zone (Zone-III) of Karnataka. The crop could not be established in the plot which received spentwash for more than 20 years. Continuous application of spentwash for 5 to 10 years registered significantly higher growth, yield and quality parameters of sugarcane like millable cane height, diameter of cane, number of internodes, intermodal length, number of millable canes, single cane weight, dry matter, yield, brix per cent, pol per cent and purity per cent. Potassium and sodium contents were higher in the treatment that received spentwash for 15 to 20 years while lower potassium and sodium contents were observed in control treatment. The ratio of potassium and sodium was lower in the treatment that received spentwash for 15 to 20 years when compared to other treatments. The uptake of nitrogen, phosphorus and potassium was higher in the treatment that was irrigated with spentwash for 5 to 10 years