Skip to Main Content

Biomass yield and content are important parameters to estimate the nutrients removed by plant absorption. Thus, to the end of the experimental period, about 10.6 kg of dry biomass were obtained from DP1 and 7.2 kg from DP2. The average nitrogen content in biomass was 5.4% (±1.4), therefore it was possible to estimate the amount of nitrogen removed by plant uptake which were 585 g and 390 g in DP1 and DP2, respectively. These data mean that about 27% of TN removed (3.5 kg) was due to plant absorption. This percentage complies with Mohedano et al. (2012b) who conclude that the route of nitrogen mass removed depends on the ammonia load applied (higher loads favor nitrification/denitrification). Zimmo et al. (2004) also mention denitrification as the main route. During the spring plant absorption could be stronger than in others seasons due to the higher growth rate as demonstrated in Table 3.

Table 3

RGR of duckweed in different seasons

 Spring (n = 23)Summer (n = 18)Autumn (n = 11)Winter (n = 5)
RGR (g·m−2·d−1DP1 5.91 4.99 3.83 4.52 
RGR (g·m−2·d−1DP2 4.88 2.26 2.49 2.06 
 Spring (n = 23)Summer (n = 18)Autumn (n = 11)Winter (n = 5)
RGR (g·m−2·d−1DP1 5.91 4.99 3.83 4.52 
RGR (g·m−2·d−1DP2 4.88 2.26 2.49 2.06 

Close Modal

or Create an Account

Close Modal
Close Modal