04555nam a2200457 a 4500 20260817163619.0 171114s2012 th ad ||| 000 0 eng d .b12143492 AIT Thesis no.AQ-12-02 Perera, Anusha Dilhani An assessment of nitrogen and phosphorous losses through seepage in fertilized aquaculture ponds Pathum Thani, Thailand : Asian Institute of Technology, 2012 62 leaves : col. ill., charts Thesis ; no. AQ-12-02 A thesis submitted in partial fulfillment of the requirements for thedegree of Master of Science inAquaculture and Aquatic Resource Management, School of Enviroment, Resources and Development Thesis (M.Sc.) - Asian Institute of Technology, 2012 The present thesis studywas conducted in three 169.42 m2earthen ponds at Asian Institute of Technology, Thailand, to investigate nitrogen and phosphorus losses through seepage during the culture of sex reversed all male Nile tilapia (Oreochromis niloticus)at 3fish per m3 during initial experiment period. There were three treatments in triplicate each: (A) nutrient losses at 0.4-0.6 m depth range (B) nutrient losses at 0.6-0.8 m depth range (C) nutrient losses at 0.8-1.0 m depth range. Total nitrogen lost to air during the experiment period was also calculated.The study showed that 6.58 % of nitrogen and 17.15 ± 1.32 % of phosphorus were lost through seepage during initial experiment period. Nutrient budget revealed that there were significant difference (P<0.05) of both total nitrogen and total phosphorusseepage in different depths.Total phosphorus seepage was significantly higher than total nitrogen seepage. Nitrogen was become zero at 1.09 m bottom depth and phosphorous seepage was at 1.12 ± 0.04 m of bottom depth. Average monthly water seepage calculated from weekly sampling, it was 19.8% or 22.71cm/month from total input water. Initial soil analyses were showed that pond bottom was consists with 46.4 ± 0.7% of clay soil with 28.74 ± 1.13 % of moisture and 1.19 ± 0.04 gcm-3of bulk density, because ofwater seepage was depended on soil characteristics.The estimated N and P budgets in both inputs showed that fertilizer was the major source of nutrient accounting for 47.3 ± 0.76% N and 50.6 ± 1.65% P and were not significantly different (P>0.05). Totalnitrogen lost air to showed 3.066 ± 0.06 % including NH3 volatilization was 2.026% at 28 °C and 7.076 ± 0.4 pH. Water column results showed 8:1 of TN and TP during the initial experiment period. The study demonstrated nutrient losses in semi-intensive Nile tilapia culture system. However observation results, references results and mass balance equation showed balance nutrient budget in semi-intensive tilapia aquaculture ponds including main nutrient losses, such as nutrient seepage, nutrient in water column, nutrient deposited on soil, total nitrogen lost to air and nutrient deposited on fish body. Fish ponds Fertilization Nitrogen Phosphorus Seepage Yakupitiyage, Amararatne, Chairperson Gallardo, Wenresti G., Examination Committee Dabbadie, Lionel, Examination committee ADB -Japan Scholarship Program (ADB-JSP), Scholarship donor Asian Institute of Technology. Thesis ; no. AQ-12-02 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B01804 .b12143492 mnait j 240404 0 141114 m a j 3 000:001:PDF:b1214349:001842:0:0:0:0:0:0 Abstract -- AIT Thesis no. AQ-12-02 n mnait mnait mnarc 20 40 Barcode : 30050120696223 CREATED : 2014-11-17 RECORD # : i12826984 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050120696355 CREATED : 2014-11-17 RECORD # : i12826996 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050120400527 CREATED : 2018-03-01 RECORD # : i13113616 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 9244 9244 0 0 0 0 MAIN MAIN mnait 2026-08-17 50.00 0 AIT Thesis no.AQ-12-02 30050120696223 2026-08-17 16:36:19 1 2026-08-17 20 0 0 0 0 MAIN MAIN mnait 2026-08-17 50.00 0 AIT Thesis no.AQ-12-02 30050120696355 2026-08-17 16:36:19 2 2026-08-17 20 0 0 0 0 MAIN MAIN mnarc 2026-08-17 0 AIT Thesis no.AQ-12-02 30050120400527 2026-08-17 16:36:19 1 2026-08-17 40