الفهرس 
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Abstract
Among all of biostimulants, macroalgae have received considerable interest because they are locally available and cost effective. So, the present study is concerning with the use of Ulva fasciata, Cystoseira compressa, Laurancia obtuse liquid extracts as priming solutions for promoting germination and seedling growth of V. sinensis, P. sativum and Z. mays. SLEs was applied for investigating their potentiality in alleviating negative drawbacks of seawater supplementation on V. sinensis and Z. mays as well as reducing the amounts of nitrogen chemical fertilizer used. The major research activities and outcomes of the present study can be summarized as follows: Preparation of SLEs and selection the concentration that give the maximum enhancement of seedling growth (2.0%) in addition to chemical characterization of SLEs. LLE had the superiority in all determined germination criteria GI, RSG, SIV and RRE in V. sinensis, P. sativum and Z. mays. It was found that SLEs in combinations of two extracts significantly stimulated seedling growth parameters of V. sinensis and Z. mays in the following descending order CLLE ˃ ULLE ˃ UCLE whereas, the maximum growth promotion was recorded to the consortium of the extracts (UCLLE). Data revealed that SLEs have the potentiality to ameliorate the harmful effect of salinity on seedling growth when irrigated with 10% and 25% seawater as was noticed in V. sinensis and Z. mays. This recovery could be attributed to the richness of seaweed extracts sugars, phytohormones, amino acids, minerals and antioxidants. One experiment was conducted to investigate the ability of SLEs to reduce the amount of nitrogen chemical fertilizer recommended dose. Data revealed that conjugated treatments of SLEs with NCF exhibited significant positive influences on seedling growth of either studied plants and the maximum response was detected in UCLLE+NCF treatment. This pattern of response was obtained in both sandy and siliceous soil (uncultivated soil). Growing UCLLE+NCF treated plants for 5 weeks in siliceous soil, demonstrated that the late vegetative stage for the two plants confirmed the capability of this treatment with SIS maintained growth of the two investigated plants and gave future prospective for reclamation of uncultivated soil.