الفهرس 
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Abstract
The present investigation was carried out at El-Karada station of irrigation requirements, Kafr El-Sheikh Governorate ,during two successive growing season 2010&2011 for maize crop and 2010/2011 &2011/2012 for sugar beet crop, with the aim of study and evaluate the effect of irrigation regimes after depletion 40%,50% and 65% from available soil moisture at three locations : near canal ,midway and near drain on yield and its components , some water relations and contribution of water table to water requirements for both crops.
The importance results can be summarized in the following:
High values of crop water use efficiency by maize crop (CWUE), Applied water use efficiency (AWUE) and ground water contribution (GWC) Were obtained at irrigation Treatments 40-50% SMD .Irrigation regime and water table location had a highly significant effect on maize grain yield at irrigation at 40% SMD ,which gave high values of net income from water unit (1.13&1.10LE/m3applied water) and high value of economical efficiency (1.72&1.56) at near canal location in both seasons.
High values of water use efficiency by sugar beet and applied water use efficiency were obtained at irrigation treatment 50% SMD. Irrigation regime had a significant effect on sugar beet yield. Also, sugar %, white sugar % and juice purity % had affected by location of water table ,meanwhile, the lowest of sugar losses % was obtained at irrigation regime 40% SMD. The highest values of sugar yield was occurred ,adjacent near canal .Irrigation sugar beet at 50% and 40%SMD gave highly net income from water unit (2.01&1.84 LE/m3 applied water) and economical efficiency (2.0&1.67 ), respectively .So, it can be descend the effect of irrigation regime on sugar beet from the economic view in the following order: 50%>40%>65%%SMD .
It could be concluded that the present study has a good job in the field of water requirements for two essential crops in north Nile delta region, as well as, the benefit of ground water table in saving water requirements for crops, which had a greatest importance as additional sources for irrigation water, especially under the condition of shortage water in Egypt.