2018/4/1/ · In this study, NH 4 +-N dominated the inorganic nitrogen during composting, and the concentrations of NH 4 +-N in all treatments increased dramatically during early stages of composting because of ammonification, and reached peak value on day 5 in pile 1 and pile 3, and on day 10 in pile 2 and pile 4, respectively (Fig. 1 a), this trend was similar to other literatures