Composting process emits various volatile chemicals,including hydrocarbons,nitrogen compounds,sulfur compounds and oxygenated compounds.These gases must be treated to avoid atmospheric pollution.Spraying the extracted materials from plant such as acacia catechu and bamboo to the surface of windrow is a novel odor reduction technique for the treatment of gaseous emissions from composting facilities.In this case,the plant extraction was sprayed directly to the surface of the windrow and the spraying frequency was three times a day.