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Manure Based Duckweed Production in Shallow Sink : Effect of Nutrient Loading Frequency on the Production Performance of Lemna purpusilla |
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N. Sultana, S. A. Chowdhury, K. S. Huque, Q. M. E. Huque |
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| Abstract |
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Effect on the bio-mass and nutrient yield of Lemna perpusilla Torry was studied at two nutrient loading frequencies. Six polythene sinks (6????.5 m3 area) randomly allocated to two treatments having three sinks in each treatment. Each sink containing 6????.35 m3 water body, was changed either daily with 12.6 kg anaerobically fermented cattle manure (effluent) or with 76 kg efluent at six-day interval. Media Kjeldhal-N (40 vs. 36 mg/L; p>0.05) and NH3-N (9 vs 7 mg/L; p<0.05) concentration were higher in daily charged sinks than those charged at six-day interval. However, temperature (28.48吏퇒 vs. 28.60吏퇒) and pH (6.82 vs. 6.84) were sinilar in both groups of sinks. Biomass (93 vs. 80 g/m2/d) and crude protein (1.24 vs. 1.11 g/m2/d) yield were non-significantly (p>0.05) higher in the daily charged than 6-d interval charged ponds. However, dry matter (4.52 vs. 4.15%), organic matter (83 vs. 84%), crude protein (31.4 va. 29.6%) and organic carbon (47 vs. 47%) content were similar in both daily and 6-d interval charged ponds. There were no apparent relationships between the crude protein content of Lemna and the media Kjeldhal-N or NH3-N concentration apparently due to saturated level of nutrient (N in particular). It was concluded that with the level of effluent used for two treatments, nutrient-loading frequency had no significant effect on the biomass and protein yield of Lemna. Technique described here can be used for year-round duckweed production from fermented cattle manure for feeding poultry/fish in smallholder production system. |
| Keywords:
Lemna; Effluent; Biomass Yield; Nutritive Value |
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