The possibility of growing duckweed (Lemna minor) on anaerobic digester effluent and its nitrogen and phosphorus acquisition potential was studied. Duckweed was cultured for 21 days on an anaerobic digester effluent using two methods: static aeration (SAT) and normal batch reactor (NBR) techniques, respectively. The treatments involved pure effluent and 1/10, 1/25 and 1/50 effluent dilutions, respectively. Fifty duckweed fronds were grown in the anaerobic digester effluent for 21 days. At the end of the growth period, phosphate levels, total ammonium nitrogen (TAN) and total oxidized nitrogen (TON) contents of the growth media were determined. Total nitrogen concentration and orthophosphate P content in the duckweed were also determined. The results obtained indicated that duckweed was capable of growing on the anaerobic digester effluent provided its TAN content did not exceed 42 mg N l . The results have demonstrated that duckweed has the potential to recover N and P from anaerobic digester effluent.
The use of fertilizer and fungicide sustains cocoa production in areas where black pod disease is severely endemic giving annual yields in two districts of 1167 and 1422 kg/ha compared with 425 and 624 kg/ha in the untreated control. Combined fertilizer and fungicide was significantly better than either alone.
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