000 04555nam a2200457 a 4500
005 20260817163619.0
008 171114s2012 th ad ||| 000 0 eng d
035 _a.b12143492
099 9 _aAIT Thesis no.AQ-12-02
100 1 _aPerera, Anusha Dilhani
245 1 3 _aAn assessment of nitrogen and phosphorous losses through seepage in fertilized aquaculture ponds
260 _aPathum Thani, Thailand :
_bAsian Institute of Technology,
_c2012
300 _a62 leaves :
_bcol. ill., charts
490 1 _aThesis ;
_vno. AQ-12-02
500 _aA 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
502 _aThesis (M.Sc.) - Asian Institute of Technology, 2012
520 _aThe 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.
650 0 _aFish ponds
_xFertilization
650 0 _aNitrogen
650 0 _aPhosphorus
650 0 _aSeepage
700 1 _aYakupitiyage, Amararatne,
_eChairperson
700 1 _aGallardo, Wenresti G.,
_eExamination Committee
700 1 _aDabbadie, Lionel,
_eExamination committee
710 2 _aADB -Japan Scholarship Program (ADB-JSP),
_eScholarship donor
810 2 _aAsian Institute of Technology.
_tThesis ;
_vno. AQ-12-02
856 _3Full-Text
_uhttp://203.159.5.9/ait-thesis/detail.php?q=B01804
907 _a.b12143492
_bmnait
_cj
902 _a240404
998 _b0
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962 _a000:001:PDF:b1214349:001842:0:0:0:0:0:0
_tAbstract -- AIT Thesis no. AQ-12-02
_vn
945 _lmnait
945 _lmnait
945 _lmnarc
942 _c20
942 _c40
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