الفهرس 
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Abstract
This study was carried out at the Experimental Farm of Faculty of Agriculture, Assiut University, Assiut, during the summer seasons of 2007 and 2008, The study aimed to find out the performance of growth and yield of two genotypes of okra., (Experiment І) and two Eggplant cultivars (Experiment ІІ), grown at different irrigation intervals. Irrigation intervals were 12 , 18 , 24 and 30 days respectively in the two tested crops.
This study includes two experiments .The first Experiment (Effect of water stress on physiological traits and yield of okra)
Tow genotypes of okra were tested in this experiment .The local Balady cv. and line 16 which a breeding line produced by Dr. Hassan A. Hussein, Dept, of Hort, Assiut Univ., Plants of the two genotypes were subjected to different irrigation intervals 12, 18, 24 and 30 days. The results of this experiment could be summarized as follows:
1-Effect of irrigation interval on eggplant and okra plants.
-Irrigation interval significantly affected all tested characters in both crops and their cultivars.
-The shortest irrigation interval (12 days) resulted in the highest values of stem length and diameter, number of branches per main stem ,root length and diameter , number of branches per root ,stem fresh and dry weight and root fresh and dry weight in all tested crops and cultivars.
-The longest irrigation interval ( 30 days) showed reveres effect on all tested crops and cultivars.
2 - Crop and cultivar differences in response to water stress
Over all irrigation treatments the tested two cultivars from each crop showed different response to water stress
-Okra plants of Line 16 had tallest plants than Balady cv.
- Stem diameter and number of stem branches were higher in okra Balady cv. than Line 16
- Okra plants of Balady cv. showed higher values of root length , root diameter and number of root branches than Line 16 plants.
- Okra stems and roots showed higher fresh and dry weight per plant in Line 16 than Balady cv.
-Eggplant plants from Balady Black cv. showed taller stems and more branches per main stem than plants of Black Beauty cv.
- There were no significant differences between Black Balady and Black Beauty cvs.regard stem diameter.
- There were no significant differences between Black Balady and Black Beauty cvs. regard root length
-Roots of Black Balady plants were taller and had more branches than plants of Black Beauty cv. .
- Okra plants of Line 16 flowered earlier and yielded higher total yield than these of Balady cv. However the early yield was lower than Balady cv. .
-Eggplant plants of Black Beauty cv. flowered significantly earlier than Black Balady cv..
- Early and total yield of eggplant was higher in Black Beauty cv. than Black Balady cv. .
3- Effect of interaction between irrigation interval and cultivar.
- Okra plants of Line 16 was the earliest to flower when irrigated every 30 days.
- Okra plants of Balady cv. gave the highest early yield when irrigated every 30 days .
- Okra plants of Line 16 yielded the highest total yield in both seasons of the study when irrigated every 12 days .
- Eggplant plants of Black Beauty were the earliest to flower in both seasons of rhe study when irrigated every 24 and or 30 days.
- Eggplant plants of Black Beauty cv. produced the highest early yield in 2007 season but the response was not clear in the second season of the study.
- Eggplant Plants of Black Beauty cv.gave the highest total yield in both seasons of the study
1. Physiological Traits of okra
• The averages of the transpiration have been increased in the afternoon which in turn affects the relative water content in the plant with differences in the amount of the daily lost of each variety.
• The effect of water shortage in soil over holes’ opening and closing which has shown that the percentage of the closing holes were higher than opening holes especially in the line 16.
• The efficiency of the water usage in the line 16 was higher than the efficiency of the water usage in the local okra as the soil water has declined..
1. Physiological Traits of eggplant
• Rate of respiration was high during afternoon compared to decrease in water content and its effects by environmental factors.
• Ratio of opening and closing holes was affected by environmental factors and soil water contents where the ratio of closing holes in Roman eggplant(variety Black Beauty) was high compared to local eggplant (variety Local Black).
• Efficiency of water usage in Roman eggplant(variety Black Beauty) was increased compared to local eggplant(variety Local Black) with reduced quantity of water lost in Roman eggplants (variety Black Beauty) which led to increment in yield.
Abstract:
• possible increase in the harvest crops of okra and eggplant during convergence periods of irrigation.
• Get an early crop of delay during periods of irrigation.
• Check Igor possible that shows the extent of plant tolerance to water stress
• By examining the stomata can be identified for the plant’s need for irrigation.