One of the major issues with pomegranate production in arid and semi-arid climate is the white arils of fruit. The known plant regulators abscisic and jasmonic acids play a variety of roles in plant growth and the reduction of abiotic stresses. However, little is known about their application to improve the quality of pomegranate fruit, particularly white arils, in semi-arid environments. Herein, the experiments, in this study, were performed in two consecutive seasons 2020 and 2021 on 10-year-old Wonderful pomegranate trees to spotlight the improvement of the aril coloration and fruit quality by spraying with abscisic and jasmonic acids under semi-arid climatic conditions. Fifteen Wonderful pomegranate trees were subjected to five treatments (three replications for each). The tested treatments included abscisic acid (ABA) at the concentrations of 600 and 800 µg−1 mL, jasmonic acid (JA) at the concentrations of 10 and 15 Mm, and the control treatment (distilled water). The physical and chemical characteristics of the fruit quality of Wonderful pomegranate improved significantly when the trees were treated with abscisic or jasmonic acids. The foliar addition of ABA at 600 and 800 µg−1 mL increased the anthocyanin index by 96.74 and 114.75%, respectively, in the first year and by 49.48 and 67.62% in the second year, in comparison with the control. The foliar addition of ABA at 800 µg−1 mL was more effective than jasmonic acid in enhancing most of the chemical fruit properties, especially the anthocyanin index. The high level of ABA (800 µg−1 mL) gave the minimum fruit acidity and the highest fruit quality. Abscisic acid induces the fruit acidity and enhances the aril coloration in Wonderful pomegranate. In semi-arid conditions, it is recommended to spray the Wonderful pomegranate trees with abscisic acid at 800 µg−1 mL to improve the fruit quality and to increase the aril coloration.

This study was conducted during two successive seasons of 2018 and 2019 on Balady Mandarin trees, 20 years old budded on sour orange rootstock and planted at 5×5m apart. Grown at the productive farm located at Shandawel Island, Sohag governorate. This experiment aimed to study the effect of active dry yeast, ascorbic acid, vitamin B complex and their combination on yield components, alternate bearing and fruit quality of Balady Mandarin cultivar grown under Sohage conditions. The obtained results showed that using of active dry yeast at 10g/l (as soil application) as single application or in combination with ascorbic acid and vitamin B complex at 1g/l from each (foliar application) caused a pronounced increasing of fruit numbers, fruit weight (g) and yield (kg). The later also improved fruit quality in terms of TSS%, TSS/acid ratio as well as total sugars, vitamin C content and reducing total acidity of Balady Mandarin fruits. According to results of the current study it could be concluded that using active dry yeast at 10g/l (as soil application) as single treatment or in combination with spraying ascorbic acid (1g/l) plus vitamin B complex (1g/l) three times on the first week of May, July and September led to improve both yield and fruit quality of Balady Mandarin Cultivar under Sohage environmental conditions.

This study was carried out during three successive seasons of 2019, 2020 and 2021 on 25 years old Balady mandarin trees budded on sour orange root stock and planted at 5 x 5 m apart.The selected trees grown at the experimental orchard of Faculty of Agriculture, Assiut University Egypt. Where the soil has a clay texture and welldraining, surface irrigation was used. Therefore, this study aimed to investigate the effect of seaweed extract, potassium and micronutrients on yield and fruit quality of Balady Mandarin trees.Forty-eight healthy trees, uniform in vigor as possible were chosen. The chosen trees were divided into eight different treatments including the control. The selected trees received four sprays from each treatment at full bloom, just after fruit setting, first week of July and September.Treatments were arranged in a randomized complete block design with three replications per treatment, two trees each. All the studied treatments significantly increased yield, fruit physical and chemical properties and decreased total acidity %. The best treatments during the three study seasons were spraying with potassium at 2% + micronutrients at 3% + seaweed extracts at 2%. According to the previous results, it could be concluded that spraying Balady mandarin trees with liquid potassium 2% + micronutrients 3% + seaweed extracts 2% four sprays at full bloom, just after fruit set, first week of July and September to measure yield and improve fruit quality.

This investigation was implemented during two successive seasons (2020 and 2021) on Ruby Seedless grapevines cultivated at the Experimental Orchard of Assiut University, Faculty of Agriculture. This work was designed to investigate the effectiveness of Ascorbic, Citric, and Abscisic acids on yield and anthocyanin concentration in the Ruby Seedless grape cultivar under Assiut climatic conditions. The obtained results revealed that all the treatments significantly increased the total yield/vine as compared to the control (untreated vines). Importantly, the highest yield weight was acquired from the Ascorbic acid (AA) at 600 ppm + Citric acid (CA) at 600 ppm + Abscisic acid (ABA) at 600 ppm treatment. In addition, the treatment of AA at 600 ppm + CA at 600 ppm + ABA at 600 ppm gave the highest value of anthocyanin content.