الفهرس 
Introduction
location of the experimentOnly 14 pages are availabe for public view
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Abstract
Tow field experiments, were conducted at ElKarada, Kafer ElSheikh Governorate water requirements research InstituteNational Water Research Center during 2003 and 2004 seasons to study the effect of different sources (fresh irrigation water (I) and drainage water(D)) and levels of irrigation water (watering at field capacity, field capacity +10%, field capacity+20%) on maize yield, water use efficiency and soil salinity. The results showed that The lowest value of water applied was recorded with irrigation at field capacity, while the highest value was recorded with irrigation at field capacity+20% in the 1st and 2nd seasons respectively. The daily water consumptive use decreased with increasing drainage water. The highest value of consumptive use was recorded from the irrigation with fresh water at field capacity+20% (I1D3), while the lowest value resulted from the irrigation with drainage water at field capacity (I5D1). Data showed that the maximum value of crop water use efficiency and field water use efficiency was obtained from I 1 under D 1 treatments. The nearest ETp values to the average are obtained from Modified Blaney & Criddle, while the Fareast are obtained from Modified Penman and Radiation in the 1st season and Pan class A and Radiation in the 2nd season. The values of (Kc) showed slight increase with the time after planting till they reached their peak in July and then they decreased again at the end of growth season. It could be recommended to be use the Modified Blaney & Criddle or Penman Monteith equations to calculate the evapotranspiration of maize plants grown in the North of Nile Delta. The maximum EC value was obtained in all layers as a result for using drainage water. The levels of irrigation water were decreased the EC value. Results indicated that there was significant effect in the Plant height in the 1st and 2nd seasons there was significant effect in grain yield in the 1st season but it was not significant in the 2nd season. Generally it could be concluded that the different sources and levels of irrigation water decreased the yield component of maize crop. The obtained results indicated that it may be recommended to be used treatment I2D1 (One fresh +One drainage at field capacity), where the decrease in production was about 6.79% and we can saving irrigation water about 50% of fresh water.