The main objective of this investigation was to study to which extent the content of nutrients in water farming is sufficient for growing tomato plants, determine the proportion of nutrients that was taken up by plants (lecttuce) to the total nutrients content in the fish farm and the effect of this (nitrogen exit of fish farm) on reducing the costs of plant production which resulted in increasing the economical income under this study. To achieve that was studied the effect of source of nutrients (effluent fish water and nutrient solution), flow rate (1.0, 1.5 and 2.0 L min-1) and length of gully (2, 3 and 4 m) on the following parameters: nutrient uptake, dry weight and NO3-N content in plant. The obtained results indicated that the dry weight of shoots increased in nutrient solution over those of effluent fish farm. The dry weight of shoots decreased with increasing the flow rate and the length of gully. The dry weight of roots increased in nutrient solution over those of effluent fish farm. The dry weight of roots decreased with increasing the flow rate and the length of gully. The No3-N content significantly increased in nutrient solution over those of effluent fish farm. The No3-N content decreased with increasing the flow rate and length of gully. The No3/protein ratio increased in nutrient solution over those of effluent fish farm.
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