الفهرس 
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Abstract
A field experiments were conducted at the experimental farm of Rice Research and Training Center (RRTC). Sakha, Kafr El Sheikh, Egypt during 2003 and 2004 rice seasons to investigate the effect of different levels of farm yard manure (FYM) as organic fertilizer namely 0, 2 and 4 ton fed1 combined with different levels of nitrogen fertilizer namely 0, 23, 46 and 69 kg N fed1 in the urea form under different irrigation intervals namely continuous flooding , irrigation every 6 day and irrigation every 9 day on rice yield and yield component of Sakha 101 rice cultivar and the behavior of some elements (N, P, K, Zn, Fe and Mn) in soil and plant as well as water relations. The study concluded that, good management irrigation water and rationalizing the use chemical fertilizers has to be considered for the sake of saving some of irrigation water and reduce the contamination of daring water besides the sustainability of soil fertility. the study concluded also that switching from continuous flooding to irrigation every 6 days can reduce the amount of water consumed by rice with minimum reduction of yield. the combination between organic and inorganic fertilize is a good way for increasing fertilizer use efficiency and decreasing the adverse effect of inorganic fertilizer on the environment. The application of organic fertilizer was found to increase the availability of most of nutrient elements needed by the rice crop.