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Growth of duckweed and azolla in different dilutions of anaerobically digested swine wastewater (ADSW). (A-D) Growing duckweed; (E-G) Growing azolla; (A) and (E) controls; (B) 50% ADSW; (C) 10% ADSW; (D) 2.5% ADSW; (F) 15% ADSW; (G) 2.5% ADSW; bar =1 cm.
