Asian Journal of Earth Sciences1819-18862152-3509Science International10.3923/ajes.2012.63.6915N Isotope Techniques for Estimating N Dynamics and N Uptake by Rice from Poultry Manure and Sewage Sludge]]>GhoneimAdel Mohamed UenoHideto AsagiNaomi WatanabeTakeshi 2201252Sole use of chemical fertilizers as a nutrient source for intensive paddy rice production has likely caused a decline in soil fertility and rice yields. This study examined the effects of poultry manure and sewage sludge application on nitrogen (N) uptake, dynamics and efficiency of usage. A 15N isotope dilution method was used to estimate the amount of N in rice plants derived from the poultry manure and sewage sludge. The results showed that the percentage of 15N recovered from sewage sludge and poultry manure was 19 and 36%, respectively. Most of the N uptake by rice was from the soil and varied from 54-64%. The relative efficiency of poultry manure and sewage sludge was 80 and 85%, respectively. No significant difference was observed in the N loss rate and the N residual into soil post harvesting between the poultry manure and sewage sludge.]]>Ebid, A., H. Ueno, A. Ghoneim and N. Asagi,2008304241248Chantigny, M.H., P. Rochette and D.A. Angers,200181131137Fried, M. and L.A. Dean,195273263272Ghoneim, A.,2007291117Ghoneim, A., H. Ueno and A. Ebid,2006Brassica campestris L.) growing soil fertilized with biogas slurry and chemical fertilizer using 15 N Isotope dilution method.]]>924262431Ghoneim, A., H. Ueno, A. Ebid, N. Asagi and I. Abou El-Darag,200831119Hood, R.C., K. N'Goran, M. Aigner and G. Hardarson,1999208259270Jenkinson, D.S., R.H. Fox and J.H. Rayner,198536425444Matsuyama, M., A. Ushio, T. Kuwama and J. Yoshikura,200374533537Mubarak, A.R., A.B. Rosenani, A.R. Anuar, D. Zauyah and D. Siti,20032618411858Nishida, M., K. Tsuchiya and S. Yamamuro,200415N-labeled organic materials applied to transplanted rice in Northern Kyushu region of Japan.]]>50225232Stevenson, F.C., F.L. Walley and C. van Kessel,19986213271334Takahashi, S., S. Uenosono and S. Ono,2003251291301Zaman, M., M. Matsushima, S.X. Chang, K. Inubushi and L. Nguyen et al.,20042O production and soil microbiological properties as affected by long-term applications of sewage sludge composts.]]>40101109