According to Viel et al. [21] the increase
in total N may be due to the dry mass net loss as
the loss of organic C as CO2 during composting.In
addition, the N values might also increase due to the
nitrogen-fixing bacteria activity that commonly occurs at
the end of composting.Although a decrease of N
can occur due to leaching of NO−3-N and ammonia
volatilization, in this experiment, both piles were covered
with plastic to retain the moisture and avoid moisture
from outside, which could lead to the result obtained.