TY  - BOOK
AU  - Perera,Anusha Dilhani
AU  - Yakupitiyage,Amararatne
AU  - Gallardo,Wenresti G.
AU  - Dabbadie,Lionel
ED  - ADB -Japan Scholarship Program (ADB-JSP), 
TI  - An assessment of nitrogen and phosphorous losses through seepage in fertilized aquaculture ponds
T2  - Thesis
PY  - 2012///
CY  - Pathum Thani, Thailand
PB  - Asian Institute of Technology
KW  - Fish ponds
KW  - Fertilization
KW  - Nitrogen
KW  - Phosphorus
KW  - Seepage
N1  - 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
N2  - 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.
UR  - http://203.159.5.9/ait-thesis/detail.php?q=B01804
ER  -