الفهرس 
Introduction
Location of the expermentOnly 14 pages are availabe for public view
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Abstract
Two field experiments were carried out during two successive summer seasons 2003 and 2004 in Borg Nor ElHomse village; Aga district; Dakahlia Governorate, Egypt, to study the effect of irrigation, potassium and zinc fertilization on the plant growth, yield, chemical constituents of sweet potato roots [Ipomoea batatas L. (Lam)] Abees cultivar and water use efficiency. The growth parameter (plant height, leaves number, stems number, chlorophyll content and leaf area), yield and yield component, chemical composition and uptake, quality and water relations were determined in both seasons. Generally, it is noticed that the highest yield of sweet potato tubers and tuber quality were obtained from the interaction of irrigation at 25% (I2) depletion of available water at FC, potassium fertilization at 48 kg K2O fed1 (K2) and zinc foliar application at high rate of 0.2% (Zn3). Water saving amounted to 17.68% (540 m3 fed1) according to I2 treatment. Sweet potato is estimated at 281068 feddan. Hence, water saving on the national level is estimated at 539 million m3. This amount could be sufficient to irrigate more 8431 feddan of new lands (One fed. of new lands needs 1800 m3 of water using drip irrigation). Finally, from the view of saving irrigation water and sweet potato tuber yield and quality, the present study can recommended by applying the treatment of interaction I2<U+00D7>K2<U+00D7>Zn3.