This field experiment was conducted in the Central Highland Farm Research Station, Dhamar, during two seasons (2004/ 2005 & 2005/ 2006 ) aiming at improving water use efficiency and increasing potatoes production per unit of water. The split plot design was used with two factors: the first included 3 levels of water ( A1= 300, A2= 600 and A3 "Control"= 820 mm/ season). While the second factor included two irrigation periods ( B1"Control" = irrigation at 10 days and B2= irrigation at 14 days). Results revealed that irrigation at level A2 ( 600 mm/ season) gave statistically significant difference as compared with other treatments including the control regarding water use efficiency with 3.53 kg/ m3 and the highest production ( 21.56t/ ha). No statistical differences concerning irrigation timing on crop production. The interaction effect between irrigation amount and timing on crop production has appeared in two treatments ( A2B1 & A2B2) that produced statistical difference on other treatments including the control regarding water use efficiency, with 3.69 & 3.38 kg/ m3 and a tuber product of 22.68 & 20.45 t/ ha respectively.
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