OREGON STATE UNIVERSITY
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| Title | Biological Nitrogen Fixation as a Source of Nitrogen Input in Fishponds |
| Publication Type | Conference Paper |
| Year of Publication | 1988 |
| Authors | Lin, CK, Apinhapath, C, Tansakul, V |
| Conference Name | The Second International Symposium on Tilapia in Aquaculture |
| Date Published | 1988 |
| Abstract | The potential input of nitrogen derived from natural biological fixation in water of fertilized tilapia grow-out ponds in Thailand was determined by the acetylene reduction technique for 12 ponds over a 15-month period. On average, nitrogen fixation ranged from undetectable levels of N to 105 µg/L/day in the water column, compared with 200µg/L/day input of N from chicken manure loading at a rate of 500 kg/ha/week. Estimated total nitrogen fixation in fishponds during a 5-month grow-out cycle ranged from 8.8 to 85.7 kg N/ha. Nitrogen fixation primarily occurred in daylight; it was inhibited in the dark and suppressed by elevated ammonium concentrations present in pond water. Nitrogen-fixing blue-green algae commonly present in the pond water were Anabaena, Cylindrospermum, and Nodularia. |
| URL | http://www.nrcresearchpress.com/doi/abs/10.1139/g89-141#.WRNKP5MrJrI |
| Notice of Publication Number |
