Wood pellets were burned after addn. of (NH2)(2)CO (0.5-2.5% by mass) in a low-power boiler under varying conditions. The 1st, method was based on burning pellets in the presence of solid (NH2)(2)CO which was fed in a stream of compressed air. The 2nd method consisted in the injection of (NH2)(2)CO soln. near the burner, and the 3rd one was based on the burning of pellets previously mixed with (NH2)(2)CO. In terms of NOx redn., the best results were obtained fot the 3rd method and the worst ones for the 2nd method. The addn. of (NH2)(2)CO 1.5 or 2.5% by mass was recommended. Particulate matter emission were higher at the 3rd method and lower at the other ones.