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Sandy culture experiment was conducted at Fac. of Agric., Mansoura University during the two summer successive seasons of 2010 and 2011 aimed to investigate the effect of N ( 30.0 and 150.0 ppm ) , Na ( 0.0 and 4.0 meq / l) and Ca ( 0.0, 5.0, 10.0 and 20.0 meq / l) in nutrient solution and their interaction on tomato fruit composition. Combination between the studied factors levels comprise sixteen treatments which were arranged in a split split block design with 3 replicates . The obtained results can be summarized in the following :Significant increase in tomato fruit numbers amounted by 19.72 % in the first season and 19.49 for the second one, where the total yield increases were 18.89 and 18.64 for first and second season, respectively . So fruit weight average significantly varied due to N level increase from 30.0 ppm to 150.0 ppm ( 29.12 and 15.41 % increase in the first and second season, respectively ) . Sodium application (4.0 meq /l )reduced total yield of tomato fruit by 5.16 % in the first season and a slight increase than that was found in the second one (5.5 % reduction ). N content of tomato fruit was increased from 2.53 to 3.09 % ( 22.13 % increase ) in the first season and from 2.70 to 3.19 % (18.15 % increase) in the second season due to N level increase in nutrient solution from 30. to 150.0 ppm. sodium level of 4.0 meq / l in nutrient solution significantly reduced N, P, and K content of tomato fruits. Potassium content of tomato fruits was decresed as nutrient solution Ca increase up to the highest level used (20.0 meq /l ) in both season. 20.0 meq / l Ca decreased potassium content of tomato fruit by 5.56 and 4.79 %, compared with control, in the first and second season, respectively . Neither statistically effect nor constant trend was found on total Ca resulting from increasing the nitrogen level from 30.0 to 150.0 meq /l in both seasons. NaCl -Ca took the opposite trend of total calcium, where NaCl -Ca of tomato fruits was increased (5.07 % increase), in the first season and decreased (4.72% decrease) in the second one due to the same increase in N level (from 30.0 to 150.0 meq /l). HAC-Ca, HCl-Ca and Res-Ca showed a constant trend against N level increase in both seasons. 4.0 meq /l treatment significantly increased all Ca forms in tomato fruit in both seasons, compared with that of no sodium addition . 10.0 meq / l treatment achieved the highest values of total Ca in both season ( 1726.24 and 1768.78 ppm for the first and second season , respectively ). A concomitant increase in Eth-Ca with increasing Ca level in nutrient solution up to 10.0 meq / l then slightly decreased with 20.0 meq / l treatment in both seasons. A strongly increasing trend in NaCl – Ca by increasing Ca level in nutrient solution from 0.0 Ca addition to 5.0 meq /l in nutrient solution (from 883.6 to 1253.48 and from 926.74 to 1222.90 , in the first and second season, respectively ) . Lower Labeeb, G. and Amira A. Kasem 816 decreasing rate (from 1396.25 to 1295.65 and from 1330.26 to 1256.98 ppm , in the first and second season, respectively ) was found regarding to NaCl – Ca form with increasing Ca level from 10.0 to 20.0 meq Ca /l . In both seasons Ca oxalate was significantly increased with increasing Ca level from 0.0 to 10.0 meq /l in nutrient solution, these increases appreciated by 276.49 and 275.33 % in the first and second season , respectively . A significant decrease in tomato fruit calcium oxalate due to increasing Ca in nutrient solution from 10.0 to 20.0 meq /l ( 26.62% and 25.93% increase in the first and second season respectively ) .

EFFECT Of NITROGEN, SODIUM, CALCIUM AND THEIR INTERACTION ON YIELD AND COMPOSITION OF TOMATO FRUIT.