Based on the reports by Bergmann et al. (2000a) and Cheng
et al. (2002a), the species used in the present research (L. punctata)
is one of the most efficient for this type of effluent, contributing to
its success in removing nitrogen. Additionally, the warm Brazilian
climate, with a gentle winter can improve the growth rates of
duckweed and microorganisms, particularly for native species such
as L. punctata. However, under full-scale conditions, raw manure
variances and the biomass harvest may more strongly affect the
performance of duckweed ponds than do the seasons. In the present
work, statistical relationships between the treatment efficiency
and the seasons were not found.