Optimal cultivation concentration of duckweed for pollutant removal from biogas slurry.

6 C, the NH 3 -N concentration in all treatment groups exhibited a decreasing trend as the experimental duration increased.

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Chlorophyll has a highly significant positive correlation with dry weight, productivity, relative growth rate, nitrogen content, and protein content, and a highly significant negative correlation with doubling time.

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During the same time period, the biomass of duckweed in the treatment groups with increasing concentrations showed a trend of initial increase followed by a decrease.

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