The present study was conducted to examine the effect of humic acid concentration (0, 0.5, 1 and 1.5 ml/L) and some of biofertilization treatments (control, Azotobacter chroococcum, Mycorrhizae (Glomus macrocarbium) and mix of Azotobacter chroococcum + Mycorrhizae on olive seedling which grown under three levels of saline water (2000, 3000 and 4000 ppm). this experiment was carried out during two successive seasons (2015 and 2016) on Olive seedlings Picual cultivars grown in El-Sheikh Zuwayid station, Desert Research Center North Sinai governorate, Egypt. Based on growth parameters data showed that salinity level (2000ppm) produced the highest significant parameters of the olive seedling; for seedling height, trunk diameter, Branch number., Leaf number., leaf length, leaf width, leaf area, and also the fresh and dry weight of shoot and root system. The lowest values were recorded for salinity level (4000 ppm through the two seasons. Salinity level at 2000 ppm gives the chance of growing plant to complete all of its physiological processes at a proper time than that of high concentration. Highest salinity concentration 4000 ppm caused a decline in all the studied parameters throughout both studied seasons. Increasing humic acid levels from 0.5 to 1.5 ml/L % increased significantly all studied parameters when compared with control (0) in the two studied seasons. Application of biofertilization treatments either singly or mixed enhanced growth and plant biomass of olive seedling under different salinity treatment. Mixed two types of biofertilzer had a significant effect on seedling growth than control and one type of biofertilizer treatments. In addition, Macronutrient content in olive seedling leaf positively affected with humic acid concentration and biofertilization treatments. Mixed biofertilization treatment resulted in higher values of soil microbiological properties, i.e. total microbial counts, Azotobacter densities, Mycorrhizal infection percentage, no. of mycorrhizal spores /gm, microbial enzymes in soil (Dehydrogenase, Nitrogenase and Phosphatase). It can be concluded that, to mitigate the negative impact of salinity of olive seedling we recommend to use humic acid (1.5 ml/L%) with the treatment of biofertilizer (Mycorrhiza and Azotobacter chroococcum).

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This study was carried out during three successive seasons, (2013, 2014 and 2015) in a private orchard located in North Sinai governorate, Egypt. The study was conducted on 10 years old Kalamata olive trees planted at 6 X 6 m apart grown in sandy soil, under drip irrigation system and uniform in shape and received the common horticultural practices. The aim of this study was conducted to evaluate Kalamata olive trees irrigation techniques which involve two types (whole root-zone irrigation -alternate partial root-zone irrigation) and three levels of regulated deficit irrigation values based on crop evapotranspiration (irrigated with 100%, 80% and 60% of ETc). The obtained results indicate that alternate partial root-zone irrigation increased vegetative growth, number of inflorescences per shoot, number of perfect flowers, crop yield, fruit oil content and fruit quality characteristics as compared with whole root-zone irrigation technique. On the other hand, the previous parameters recorded strong correlation with the highest level of irrigation treatments (100% ETc control treatment) while, regulated deficit irrigation with 60% of ETc recorded the lowest values in these respect while 80% ETc treatment came in between. In general alternate partial root-zone irrigation technique saved at least 20% of irrigation water as compared with whole root-zone irrigation and improving water use efficiency.

This study was conducted during two successive seasons (2016 and 2017) at El-Sheikh Zwayed, North Sinai Governorate, Egypt. The aim of this research was to investigate the effect of three anti-salt stress materials (Nile fertile, elemental sulfur and potassium sulfate) on Swelling peach cultivar under irrigation water saline stress. In this experiment Nile fertile was applied at (0, 500 and 1000 gm/ tree), elemental sulfur (95% S) as soil application at three levels (0, 500 and 750 g / tree) and potassium sulphate as foliar application on three concentrations (0, 2, and 4 g/l.) and combination of them. The obtained results revealed that all anti-salt stress substances have a positive effect on vegetative growth parameters, fruit set, and yield/tree. The highest significant value of the final fruit set, yield/tree was obtained with Nile fertile treatment followed by elemental sulfur and potassium sulphate in both seasons of this study. On the other hand, there was no significant differences between the three materials on fruit length, fruit diameter, flesh and pit fruit weight, total soluble solids, total acidity and leaf content of N%, P% and k% during both seasons of the study and leaf content of Fe (ppm) in the 1 st season. While the interaction effect between the three investigated factors shows clearly significant effects in improving vegetative growth, final fruit set no. of fruits /tree, fruit weight, crop yield, fruit physical and chemical parameters. Thus, the combination between Nile fertile 1000g/tree + elemental sulfur 750g/tree + potassium sulphate at (4g/L) gave the best results on shoot length, leaf area, initial, final fruit set %, fruit length and diameter, flesh weight (g), pit weight (g), maximum yield/tree, TSS, lowest acidity%. In addition to N, P, K, Fe, Zn and Mn in leaves in both seasons. On the other hand, untreated trees recorded the lowest values in previous studied parameters in this respect.