الفهرس 
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Abstract
This Research aims toobtain an adequate management for bubbler-irrigation system in order to overcome the problem of its field emission uniformity is low.
The Experiment was carried out at the experimental farm of the Faculty of Agriculture; Ain shams University, at Shalaquan village, Qalubia, Governorate, on (70% canopy) for Citrus crop as the total area of tree equal (5 X 5) m2.
1- Bubbler irrigation system: Two Pressure heads 120 and 160 cm were examined then it is found the results as follow:
1- Field emission uniformity (F.Eu)
a- At lateral Line length 45m field emission uniformity 42% and 68% at pressure head 120 cm and 160cm respectively.
b- At pressure head 120 cm for acceptable uniformity 89% the maximum lateral line length is 30m.
c- At pressure head 160 cm for acceptable uniformity 62% the maximum lateral line length is 15 m
2- Irrigation requirement is 2868 m3/fed/yr
3- Water use efficiency equals 0.5 kg/m3
B-Drip irrigation system: by measuring irrigation requirement andWateruse efficiency it is found the results as follow:
1-Irrigation requirementsequal 2005m3/fed/yr
2-Water use efficiency equals 1 kg/m3
Key Words: Bubbler irrigation system, Irrigation management, Citrus crop, Drip irrigation, Evapotranspiration, Irrigation requirement, Head Loss