Abstract: The effect of traditional fire on available soil nitrogen and rate of N-mineralization in the oak forest soil of Lambui hill, Ukhrul district, Manipur, North East India have been studied. The rate of ammonification, nitrification and mineralization varied from 0.08 to 5.99 µg g-1month-1, 0.40 to 2.52µg g-1month-1 and 0.46 to 9.09µg g-1month-1of soil in the traditional burnt site, 0.31 to 3.93µg g-1 month-1, 0.14 to 2.52µg g-1month-1 and 0.48 to 5.67µg g 1month-1 of soil in the unburnt site and 0.19 to 4.00µg g-1month-1, -0.09 to 2.17µg g-1month-1 and 0.33 to 5.61µg g-1month-1 of soil in the control site respectively for different months throughout the year.