A two-year trial was conducted during 2017 and 2018 seasons on Wonderful pomegranate orchard about 7 years old grown in sandy soil under drip irrigation system from well at private orchard located on Cairo-Alexandria desert road (about 50km from Cairo), Egypt. Potassium fertilizer at 250 and 350g /tree/ year alone and/or humic acid at 20 and 30g/ tree/year, added as a soil application divided into two equal doses applied at two times a year in the first week of May and July in both seasons. Generally, all tested treatments enhanced leaf characteristics, yield and fruit quality traits as well as improved fruit marketable and minimized cracked fruit percentage and sunburned fruit percentage. Moreover, soil application of potassium at 350g /tree/ year combined with humic acid at 30g/tree/year, proved to be the most efficient treatment in this respect.

AN experiment trial was carried out during 2017 and 2018 seasons on Wonderful pomegranate trees about 7 years old grown in sandy soil under drip irrigation system from well at private orchard located on Cairo-Alexandria desert road (about 50 km from Cairo), Egypt. Treatments of salicylic acid (50,100 and 150 ppm), ascorbic acid (500, 750 and 1000 ppm) and tap water control were foliar sprayed twice a year i.e. at full bloom and four weeks later. Abstractly, salicylic and ascorbic acid treatments enhanced leaf characteristics, yield and fruit quality traits as well as minimized sunburned and cracked fruit percentages. Ascorbic acid treatment at 1000 ppm proved to be most efficient treatment in this respect.

This study was implemented through the project (Sustainable development of fruit trees affected by some environmental stress in Matrouh governorate) funded by Regional Development Centers (RDC), Academy of Scientific Research and Technology (ASRT) (Call no. 2/2019/ASRT-RDC). It was carried out on 81 trees of Manfalouty pomegranate cv (Punica granatum) during the two successive seasons of 2020 and 2021 at the Khamisa research station of D.R.C. at Siwa Oasis-Matrouh Governorate-Egypt. The study aimed to investigate the influence of salicylic acid (SA) and the biostimulant biomagic to improve fruit productivity and the quality of pomegranate var. "Manfalouty." All the treatments were subjected to the same agricultural practice. The foliar treatments were used, tap water (T1), salicylic acid 100 ppm (T2), salicylic acid 200 ppm (T3), biomagic at 7.5 cm/l (T4), biomagic at 8.5 cm/l (T5), salicylic acid 100 ppm + biomagic 7.5 cm/l (T6), salicylic acid 100 ppm + biomagic 8.5cm/l (T7), salicylic acid 200 ppm. The obtained results showed that all the treatments were affected by spraying fruit trees with salicylic acid in combination with biomagic, followed by the solo concentrations of each treatment in both seasons. Meanwhile, T9 gave the best vegetative growth, fruit physical, chemical properties, and gave the lowest total acidity, fruit cracking percentage, and sunburn percentage in the 1st and 2nd season, respectively.

The investigation was carried out during 2017and 2018 seasons on Wonderful pomegranate trees grown at private orchard located on Cairo-Alexandria Desert road about 50 Km from Cairo, Egypt. Trees planted at 3x5 meters apart in sandy soil and watered from wells using drip irrigation system. The trial was a factorial experiment, hence sustained deficit irrigation100%, 80% and 60% from crop evapotranspiration (ETc) throughout season, the occupied main plot, whereas foliar sprays of ascorbic acid treatments at 0, 500, 750 and 1000 ppm /tree located in the subplots were carried out two times, the first foliar spray was done at full bloom and the second one was performed four weeks later. The results showed that leaf characteristics (leaf area and total chlorophyll), number of fruits per tree, yield and fruit quality traits (weigh, length, diameter, weight of fruit grains, flesh percentage, weight of 100 grains and juice volume) recorded the highest values with higher both irrigation level and sprays of ascorbic acid treatments. On the contrary fruits cracked percentage and fruits sunburned percentage, peel thickness, total sugar, TSS, TSS/acidity, ascorbic acid and water used efficiency showed an adverse correlation with irrigation level. Also, spraying by ascorbic acid is reducing number of fruit cracked, number of sunburned fruits and acidity. On other hand, peel thickness, total sugar, TSS, TSS/acidity and ascorbic acid concentration were increasing. Therefore, sustained deficit irrigation is considered to be an effective strategy for arid and semi-arid regions, moreover ascorbic acid may be used to prevent or mitigate oxidative damage caused by sustained deficit irrigation.

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.