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Abstract
The present investigation was carried out at orchard of Sakha agricultural research station farm. Kafr El-Sheikh governorate during two successive seasons 2003 and 2004. The effect of drip irrigation and soil including on some soil properties as well as yield and quality of Naval orange trees at North Delta compared with surface irrigation were studied. The design of the experiment was a split plot design four replicates in two seasons. The main plots were occupied by soil inulching with 2 cm layer of rice straw and bare soil. The subplots were devoted to surface irrigation 100, 75 and 50 % Fle.