الفهرس 
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Abstract
This study was carried out during two successive seasons “2017 & 2018” on fruiting olive trees cultivated in sandy soil of a private orchard at Wadi El-Natron, El-Behera governorate. (30o 31’ 05” N and 30o 07’ 34” E). It carried on Manzanello and Picual olive cultivars.
Seventy-two bearing trees of each cultivar were selected and each of cultivar exposure to twelve different treatments in three replicates two trees for each of them. The selected trees were treated with three Irrigation levels (50, 75 and 100% of Etc.) and four concentrations of Lithovit ”its content presented in table 7” which sprayed as a foliar application (0, 2, 4 and 6 g / L) to each cultivar at the first week of February, May and August.
The obtained results cleared that irrigation at 100% of ETc achieved the highest significant values of vegetative growth parameters, improved fruit quality aspects as well as gave highest nutritional status. However, 75 % of ETc irrigation had the maximum significant values of flowering and yield aspects and balanced between total vegetative growth and total fruiting. Concrning spraying Lithovit, results cleared that spraying Lithovit at 2 g/L enhanced and improved almost all parameters under this study. The best interaction between