الفهرس 
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Abstract
Egypt has limited agricultural land which is associated with a scarcity of irrigation water and rapid population growth. Hydroponic farming, seawater desalinization contribution and magnetic treatment are among the practical solutions for sustaining rapid population growth. In this regard, the main objective of the present research study was to design and construct a hierarchical engineering unit as a hydroponic farming system (Soilless) to produce iceberg lettuce crop using magnetically- treated saline water. The treatments concluded four types of irrigation water: common irrigation water (IW1) with an electrical conductivity (EC) of 0.96 dS/m as control treatment, magnetically-treated common irrigation water (IW2) with an EC of 0.96 dS/m, saline water (IW3) with an EC of 4.56 dS/m and magnetically-treated saline water (IW4) with an EC of 4.56 dS/m; three depletion ratios (DR) of field capacity (DR0=50%, DR1=60% and DR2=70%) and three slopes of hydroponic pipes (S1 = 0.0%, S2 = 0.025% and S3 = 0.075%). The results revealed that seawater contributed 7.15% to the production of iceberg lettuce in the hydroponic system. The geometric parameter, the slope of the cultural pipes, influenced the obtained luminous intensity by an average increase of 21% and 71% for S2 and S3, respectively, compared with zero slope (horizontal pipes). Magnetization of irrigation water increased total soluble solids (TSS), also enhanced fresh weight and water productivity of both iceberg lettuce varieties used. The maximum percentages of TSS were 5.20% and 5.10% for lemur and iceberg 077, respectively for the combination IW4DR2S2. The highest values of fresh weight and water productivity of 3.10kg/m and 39.15kg/m3, respectively were recorded with the combination IW4DR2S3 for lemur iceberg lettuce. The percentages of these increases were 109.46% and 97.78%, respectively compared with the combination IW1DR0S1. The highest values of iceberg lettuce 077 fresh weight and water productivity were 2.93kg/m and 36.15kg/m3, respectively, which were recorded with the combination IW4DR1S3. The percentages of these increases were 112.32% and 120.56%, respectively compared with IW1DR0S1 (control treatment).