03775nas a2200445 a 4500 20260818171813.0 071019s2006 th uu|m rtt 0| a1eng d .b12020771 AIT Thesis no.AQ-06-23 Moe Thidar Oo Phosphorus fertilization requirement of supplemental feed-fed nile tilapia (Oreochromis nitoticus) ponds Pathum Thani, Thailand : Asian Institute of Technology, 2006 83 leaves Thesis ; no. AQ-06-23 A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science, School of Environment, Resources and Development Thesis (M.Sc.) - Asian Institute of Technology, 2006 An experiment was conducted in fifteen 200-m2 earthen ponds at the Asian Institute of Technology, Thailand during September 2005 to January 2006. The objectives of this study were to determine the effects of different rates of phosphorus fertilizer application on Nile tilapia production, pond water quality parameters, nutrient utilization efficiency under supplemental feeding, and to evaluate the cost and return of tilapia production in fed ponds fertilized at different phosphorus rates. Five phosphorus fertilization rates were used as treatments in a randomized completely block design: 100%, 75%, 50%, 25% and 0% of 7 kg P ha-1 wk-1. Nitrogen fertilization rate was fixed at 28 kg N ha-1wk-1 for all the treatments throughout the experiment. Sex-reversed all-male Nile tilapia about 100 g size were stocked at 3 fish m and fed at 50% satiation feeding rate in all ponds. Mean weight, mean weight gain, daily weight gain and net yield were not significantly different among treatments (P>0.05). Water quality parameters were not significantly different among treatments, except total Kjeldahl nitrogen, total phosphorus and soluble reactive phosphorus. Nutrient budget showed that higher rates of phosphorus fertilizer input resulted in higher phosphorus sink in the sediment. Economic analysis showed that all the treatments with phosphorus fertilization resulted in positive net returns. Gross income was not affected by different phosphorus fertilization rates. Treatment with 25% phosphorus fertilization might be used as an alternative strategy of Nile tilapia pond culture in terms of economic return and nutrient loss in sediment Nile tilapia Yi, Yang Chairperosn Yakupitiyage, Amararatne Examination Committee Thakur, Dhirendra Prasad Examination Committee Lin, C. Kwei External Expert Joint Japan Scholarship Donor World Bank Graduate Scholarship Program (JJ/WBGSP) Scholarship Donor AIT Fellowship Scholarship Donor Asian Institute of Technology. Thesis ; no. AQ-06-23 Full-Text http://203.159.5.9/ait-thesis/detail.php?qB10308 .b12020771 mnait u 240401 0 071019 m a u 0 mnait mnait mnarc 20 40 Barcode : 30050120697908 CREATED : 2006-05-22 RECORD # : i12543706 LPATRON : 1022232 LCHKIN : 2010-03-20 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 1 TOT RENEW : 0 Barcode : 30050120697932 CREATED : 2006-05-22 RECORD # : i12543718 LPATRON : 1019216 LCHKIN : 2007-01-31 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 2 TOT RENEW : 2 Barcode : 30050120358717 CREATED : 2016-08-06 RECORD # : i13025880 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 87550 87550 0 0 0 0 MAIN MAIN mnait 2026-08-18 50.00 0 AIT Thesis no.AQ-06-23 30050120697908 2026-08-18 17:18:13 1 2026-08-18 20 0 0 0 0 MAIN MAIN mnait 2026-08-18 50.00 0 AIT Thesis no.AQ-06-23 30050120697932 2026-08-18 17:18:13 2 2026-08-18 20 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no.AQ-06-23 30050120358717 2026-08-18 17:18:13 1 2026-08-18 40