A field experiment was conducted at El-Intelaq area, West Nubaria region, Behaira Governorate (31^o 02' N, 30^o 28' E, and 6.7 m above mean sea level), Egypt during the 2012 and 2013 summer growing seasons to study the effect of three irrigation treatments (i.e., I₁=75%, I₂ = 100%, and I₃ = 125% of reference ETo, which was estimated from class ‘A' pan evaporation and Kpan=0.75, two nitrogen fertilizer levels (i.e., N₁= 75%, and N₂=100% of recommended nitrogen rate), and two crop residuals mulching treatments (i.e., M₀ = without mulch, and M = with mulch) on tomato yield, amounts of applied irrigation water, water consumption, applied water productivity (AWP), leaf water potential, and to develop a local tomato crop coefficient (Kc) and yield response factor (Ky) under the experimental conditions. Results indicated that, the tested variables had significant effect on tomato yield in the two growing seasons. The highest tomato fruit yields of 80.57 and 64.42 ton/ha were obtained as a result of the interaction of I₃ (125%ETo) and N₂ treatment in the two growing seasons, respectively. Total depths of applied irrigation water and water consumption of 816.2 and 838.0mm and 573 and 574mm were recorded in the 1^st and 2^nd growing seasons, respectively, for the I₃ irrigation treatment. In both seasons, the highest AWPs values were 9.73 and 9.42 kg/m³ due to the combined effect of irrigation treatment I₁ (75% E_pan) and N₂ (100% of recommended nitrogen fertilizer). Leaf water potential values were lower with the high applied water treatment than with the stressed irrigation treatment. Average crop coefficient values were 0.51 at initial growth stage during June and reached its maximum value of 0.98 during August, and then decreased to 0.71 during October. The local seasonal average tomato crop coefficient (K_C=ETc/ETo) and yield response factor (Ky) values under the experimental conditions were 0.74 and 0.82, respectively. It was concluded that, under similar field conditions, applying a depth of water equal to 125% of ET_o and 100% of the recommended nitrogen fertilizer, and adding plant residue mulch is recommended for maximum tomato yield in the studied sandy soils under drip irrigation systems.