02810cas a2200265 a 450000500170000000800410001703500150005810000200007324500800009326000520017330000100022549000270023550001560026250200570041852017050047565000120218065000300219265000180222270000470224070000430228770000450233071000450237581000590242085600650247920260818170321.0110920s1989    th uu|m rtt   0|  a1eng d  a.b104718681 aUllah, Md. Amir10aNutrient release characteristics of duck manure for Nile tilapia production  aBangkok :bAsian Institute of Technology,c1989  a67 p.1 aThesis ;vno. AE-89-43  aA Thesis submitted in the partial fulfilment of the requirements  for the degree of Master of Science, School of Environment, Resources and Development  aThesis (M.Sc.) - Asian Institute of Technology, 1989  aThis study examined the effect of duck diet, bedding  material and manure storage on nutrient release characteristics  of duck manure in water. A second experiment examined the effect  of those factors on the suitability of duck manure for improving  yields of Nil e tilapia (Oreochromis niloticus ) .  The first experiment was fresh manure of low and high grade  diet with and without rice husk; the second one was four week old  manure of the same low grade diet as used in the first  experiment, except manure was stored under two different  conditions; and the third was four week old manure of high grade  diet stored as in the second experiment.  The accumulative ammonia-N released from manure in the first  experiment varied from a minimum 6 . 5 mg / g dry matter (DM) t o a  maximum 9 . 2 mg / g DM a nd soluble reactive phosphorus (SRP ) release  varied f rom 1 . 7 mg / g DM to 2 . 0 mg / g DM .  In second experiment , the accumulative ammonia - N release  from manure varied f rom 7 . 0 t o 8 . 8 mg/g DM a nd SRP release  varied from 2.2 mg / g DM to 2.6. mg / g DM .  In third experiment the release of ammonia-N range from  7.lto 9. 1 mg / g DM a nd t h e SRP release varied from from 3 . 5 to 4.1  mg/g DM.  Nearly all  soluble nitrogen and phosphorus were released on  the fourth day of manure application . The  release was in creased by the improved diet  management of manure. Use of bedding material  of the amount of nutrient release on a per unit  rate of nutrient  manure and proper  ca used a reduction  weight  basis.  The improved manure obtained from high grade diet in creased  the fish yield but the use of bedding materiel did not effect the  fish yield significantly. 0aTilapia 0aFishesxFeeding and feeds 0aDucksxManure1 aKnud-Hansen, Christopher F., eChairperson1 aEdwards, Peter,eExamination Committee1 aLittle, David C.,eExamination Committee2 aThe British Council, eScholarship donor2 aAsian Institute of Technology.tThesis ;vno. AE-89-43  3Full-Textuhttp://203.159.5.9/ait-thesis/detail.php?q=B17894