الفهرس 
Introduction
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Abstract
The present study was conduced at the Crop Water Requirements Research Field, during 2003 and 2004 Sakha Agricultural Research Station, Kafr ElSheikh Governorate. The main objective of this study was to find out the impact of irrigation water and watering at different physiological states on yield and cropwater parameters. To fulfill the abovementioned aims a field experiment was carried out on crop rotation, where wheat crop was planted as a winter crop and soybean was planted as a summer crop. Completely randomized block design was the statistical design in this study. The irrigation treatments for wheat were: irrigation till water depth reached 5.0 cm above soil surface (treatment A), irrigation according to soil moisture depletion (treatment B), irrigation according to Ibrahim equation (1981) treatment C). In addition, there are 4 water stress treatments: Stress during booting stage (treatment D), stress during flowering (treatment E), stress during milking (treatment F), stress during booting and milking (treatment G). The last treatment was irrigation till water depth reached 7.5 cm above soil surface (treatment H) as the control or traditional one while irrigation treatments for soybean were: irrigation in all stages according to soil moisture depletion (treatment A), stress at flowering stage (treatment B), stress during booting (treatment C) and stress at flowering and booting stages (treatment D). The main results in this study can be summarized as follows: For wheat: 1. In case of sufficient irrigation water, it might be recommended to watering wheat till irrigation water reaches 0.5 cm above soil surface (treatment A). 2. In case of water shortage, irrigation wheat could be skipped at milking stage. 3. The most critical stage for water stress in the flowering, skipping irrigation at this stage leads to yield reduction with about 32.3%. 4. The highest protein percentage of 13.51% was obtained under the stress at booting and milking stages. while, the non stress treatments were assigned with the least value of protein percentage. For soybean: 1. Under adequate irrigation water, in the effective root zone (treatment A) of nonstress conditions, was resulted in the highest seed yield 1.5 ton/fed. 2. The most critical physiological stage of soybean in relation to irrigation is the booting, skipping irrigation at this stage resulted in reduction of about 49% of seed yield. 3. The highest seed protein percentage 40% was associated with drought stress at both booting and flowering stages of growth. On the contrary, the highest oil content (21.3) was produced under then nonstress treatment A.