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The experiment was conducted during the two successive seasons of 2013 and 2014 at the Agriculture Research Station, in ElArish, North Sinai Governorate, Egypt. Tomato "GS12" hybrid was used in the experiment to study the effect of three water irrigation levels ,.i.e. 100 %, 75 % and 50 % from water requirements of tomato plants under foliar spray with two materials, i.e Dodouxil Benzene Sulphonate "DBS" and Potassium silicate "PS" at two rates 2 and 6 cm/liter on the growth, fruit yield and its quality as well as some water irrigation relationship. Split plot design was used in the experiment. The results showed that, irrigation at the level 100% from tomato requirements with foliar spray by any one of the materials used, i.e. (DBS) or (PS) at the concentration of 6 cm/liter then the concentration of 2 cm/liter recorded the high values of growth parameters, i.e. dry weight of tomato plant organs (roots, leaves and stem). The superior total yield was obtained from the same treatment. The same treatment hassend also, physical and chemical fruit quality. While irrigation tomato plants with 75% from its requirement led to reduction in fruit yield by 25% but in the same time saved 33.6% from water irrigation, moreover irrigation tomato plants with 50% levels saved about 43% from water irrigation and induced 50%reduction from tomato yield. Foliar spray with potassium silicate or Dodouxil Benzene Sulphonate showed significant values in tomato growth, fruit yield and its quality and increased the water use efficiency of tomato plants grown under the condition of North Sinai.

EFFECT OF IRRIGATION LEVELS AND SOME TREATMENTS TO REDUCE WATER LOSSES ON THE GROWTH AND YIELD OF TOMATO PLANTS GROWN UNDER NORTH SINAI CONDITIONS