N losses are taken as a whole making no difference between ammonia emission and NO and N2O emissions. The composting process when not well controlled, can results in NO and N2O emissions. No information is given on the temperature of the compost during the process even if thermocouples were installed to measure it. No information is also given to the composting process under winter conditions where the degradation processes are slowed by the low temperature and the slowing down of bacteria activity.