الفهرس 
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Abstract
INTRODUCTION
Rice (Oryza sativa, L.) is one of the most important cereal crops in Egypt.
Raising its productivity per unit land area is an essential national goal to meet the consistent demands from this crop as a basic food for the majority of population and as an export crop. This can be achieved through many factors, such as weed control and nitrogen fertilization.
Weeds are one of the major limiting factors for attaining optimum yields of rice in Egypt. Several studies were conducted on weed management in different types of rice culture in Egypt and several effective herbicides were identified (Hassan and Rao, 1993). However, the necessity to reduce the cost of inputs, increasing reports on herbicide resistance among weeds and widespread concern about environmental effects of herbicides have resulted in the increased need to develop alternate integrated weed management strategies based on the minimization of herbicide use and alternate methods of weed control.
Weeds in rice fields causes great competition for light, nutrient, space ... etc. More weeds emerged with the young rice seedlings which suffer and prolong the period of weed competition.
Saturn has been used for many seasons as a major herbicide for weed control in rice. The uses of Saturn as a major herbicide for rice can be attributed to the great selectivity of this herbicide to world rice compared with other herbicides used in rice fields. The selectivity of Saturn in controlling weeds may be attributed to the effects of Saturn in inhibiting photosynthesis, RNA synthesis and lipid synthesis in susceptible cells but not resistant cells. Similar results obtained by Hassan (1981), and Ibrahim and Hassan (1986 b)
Nitrogen is an essential macronutrient element that plays an important role in growth development and productivity of rice. In Egypt varying optimal N fertilization levels were reported by (Koriem et al. 1992, Sehly et al. 1992, and Islam et al 1997.) Whereas application of these levels, resulted in significant increases in vegetative characters, grains yield and yield components and affected grain quality by increasing protein percentage.
The present study was performed to determine the influence of different weed control and nitrogen levels on growth, yield and yield components of Sakha I OI-rice cultivar.