Pakistan Journal of Biological Sciences1028-88801812-5735Asian Network for Scientific Information10.3923/pjbs.2002.740.743WidjajantoDidik WisnuHonmuraTerumasa MiyauchiNobufumi 7200257Nitrogen derived from water hyacinth and recovered in rice crops was measured to evaluate the effect of different amounts of added water hyacinth residues into rice cultivation on the performance of rice crop, N derived (Ndev) from residues and N recovery (Nrec) in rice crop. Dry matter production and N yield of rice crop decreased significantly as the amounts of added water hyacinth increased. The Ndev from water hyacinth was significantly increased as amounts of added water hyacinth increased. In contrast, the Nrec in rice crop was significantly decreased as amounts of added water hyacinth increased. In conclusion different quantities of added water hyacinth residues influenced the performance of rice, and the N dynamics of soil-rice systems.]]>Anonymous,1999pp: 3pp: 3Barrachlough, D., 199729101108Bremner, J.M.,19651965pp: 1179-1237pp: 1179-1237Constantinides, M. and J.H. Fownes,1994264955Garrity, D.P. and M. Becker,19941994pp: 1-10pp: 1-10Hauck, R.D. and J.M. Bremner,197628219266Hood, R.C., N. Goran, K.M. Aigner and G.A. Hardarson,1999N isotope techniques for estimating crop N uptake from organic residues.]]>208259270Kamimura, Y., K. Furue and N. Nishizono,1994403948Mann, R.A. and D.P. Garrity,19941994pp: 28-42pp: 28-42Matsushita, K., N. Miyauchi and S. Yamamuro,200015N-labeled nitrogen from co-compost made from cattle manure and chemical fertilizer in a paddy field.]]>46355363Morris, R.A., R.E. Furoc and M.A. Dizon,198678413416Norman, R.J., J.T. Gilmour and R.B. Wells,199015N labeled crop residues and utilization by rice.]]>5413511356Paul, E.A.,198476275285Yaacob, O. and G.J. Blair,198015N-labeled legume residues in soils with different nitrogen contents and its uptake by rhodes grass.]]>57237248Yamamuro, S.,198115N with an emission spectrometer.]]>27405419Widjajanto, D.E., K. Matsushita, T. Honmura and N. Miyauchi,200115N-labeling techniques.]]>410751077