الفهرس 
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Abstract
A field experiments were conducted in the experimental farm of Faculty of Agriculture Kafrelsheikh University, Egypt in 2009/2010 successive growing season to study the possibility of intercropping tomatoes with Egyptian cotton using some irrigation systems, the experimental design was split-split plot design with three replications. The experiment included on the following factors : three irrigation systems (furrow irrigation, perforated pipes and drip irrigation ), three different ridges Length (15,20 and 25 m) and 5 intercropping patterns ( pure cotton, pure tomato, cotton and tomato, cotton on the two sides of the ridges and tomato in the middle of the same ridges, cotton and tomato (alternative) The results indicate that: The water application efficiency for the perforated pipes irrigation system and drip irrigation system were increased compared with furrow irrigation, water distribution efficiency for drip irrigation system was increased compared with furrow irrigation and the perforated pipes, furrow irrigation system decreased the water use efficiency compared with the perforated pipes and drip irrigation system, perforated pipes increased the Land Equivalent Ratio compared with the furrow irrigation and drip irrigation system. Drip irrigation system increased seed cotton yield by 30.4% and 27.78% compared with furrow irrigation and the perforated pipes respectively and drip irrigation system increased tomato yield by 32.15% and 7.22% compared with furrow irrigation and the perforated pipes respectively. Drip irrigation system, 25 m ridges length and cotton on the two sides of the ridges and tomato in the middle of the same ridges achieve the highest values of Water Use Efficiency and Land Equivalent Ratio.