However, in DP2, a different proportion was found; 96% of the
total removed nitrogen was due to biomass absorption, and only
4% was caused by denitrification. The applied nitrogen load was
larger in DP1 than DP2, so it is possible that almost all of the nitrogen
applied to DP2 was required for duckweed growth. Hence, it
can be concluded that at low nitrogen rates, the main removal