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Background and objective Olive tree is one of the most important and a widely distributed tree grown in many arid and semi-arid areas of the world. The production of olive in these areas is generally low due to the poor soil fertility. Zinc is one of the essential micronutrients for plants, and its deficiency is common in many crops. Boron deficiency is also a common micronutrient problem in agriculture, which results in reducing of yield production and quality. Nanotechnology has emerged as one of the most innovative scientific field in agriculture. So the objective of this work is determine the appropriate concentration of nano-zinc and nano-boron to reach the best olive fruits yield and improve its chemical and morphological traits. Materials and methods The present investigation has been made during two successive seasons of 2017 and 2018 in a private orchard located at Ismailia governorate, Egypt, to study the effect of foliar application of boron nanoparticles at a rate of 10 and 20 ppm and zinc nanoparticles at a rate of 100 and 200 ppm on leaf chemical composition, yield, and fruit quality of Picual olive tree. Results The application of boron and zinc nanoparticles in different concentration was able to effect on the qualitative and quantitative characteristics of Picual cultivar in the first and second seasons, respectively, compared with the control treatment leaves mineral content and pigments, fruit set percent, fruit drop percent, fruits yield, fruit physical, and chemical characteristics. Moreover, spraying Picual cultivar with nano-boron at 20 ppm + nano-zinc at 200 ppm (T8) is the best treatment in this study to obtain the maximum final fruit set which led to harvest the maximum fruits yield with the high seed oil percentage and low acidity in the first and second seasons, respectively. Conclusion It could recommend that spraying Picual olive trees with nano-boron at 20 ppm + nano-zinc at 200 ppm is the best treatment in this study to obtain the maximum final fruit set which led to harvest the maximum fruits yield with the high seed oil percentage and low acidity.

Background: This work was carried out through 2017 and 2018 seasons on tow olive cultivars (Kalmata and Manzanillo). Trees were 15 years old, grown in sandy soil, planted at 5 × 5 m apart, and irrigated with saline water through drip irrigation system. This investigation aimed to improve vegetative growth and its mineral contents of the tow olive cultivars. Trees were sprayed with calcium at 0.5% as calcium chloride (21% Ca) and chelated calcium. Results:The results revealed that there were significant differences with calcium source treatment regarding vegetative growth and leaf mineral contents. Conclusions: Results proved that olive trees sprayed at the end of December with 0.5% calcium as chelated calcium was the promising treatment for good vegetative growth and leaf mineral contents.

Background and objective Olive tree is very popular in the Mediterranean area because of its fruits and oil yields. Both of them are worldwide known by their beneficial health properties. Salicylic acid is naturally occurring as phenolic compound and endogenously synthesized as signaling molecule in plants and influences various physiological and biochemical functions in plants. Ascorbic acid is an antioxidant molecule and a key substrate for the detoxification of ROS. Putrescine participates in several processes of plant growth and development. Putrescine participates in several processes of plant growth and development. Therefore, the objective of this study is to determine the best concentrations of these substances to improve olive fruits yield and its chemical and physical properties. Materials and methods The field experiment was conducted during two seasons of 2017 and 2018 on adult olive trees of Picual cv. (8 years old) in a private orchard located in Ismailia Governorate, Egypt, to study the effect of foliar application with different concentrations of putrescine, salicylic, and ascorbic, in two dates of November and December. The effect of different concentrations and dates of spray under the conditions of the saline irrigation water (4.40 ds m−1) were evaluated on the fruit yield, fruit physical characteristics and fruit chemical properties of olive trees of Picual cv. Results In this study, all treatments were able to improve all studied characters compared with the control treatment in both spraying dates of November and December in both seasons, respectively. Moreover, the best yield of olive fruits in this study was recorded with the application of putrescine at 15 ppm + salicylic at 200 ppm + ascorbic at 2000 ppm in the first and second seasons, respectively. Conclusion Spraying Picual olive trees with putrescine, salicylic, and ascorbic acid in this study under the conditions of the saline irrigation water (4.40 ds m−1) was able to improve fruit yield and fruit physical and chemical properties of olive trees of Picual cv. compared with the control treatment in both spraying dates

Background This work was carried out through 2017 and 2018 seasons on Kalmata and Manzanillo olive cultivars. Trees were 15 years old, grown in sandy soil and planted at 5 × 5 m apart irrigated with saline water through drip irrigation system. This investigation aimed to improve flowering, fruit set, yield and fruit quality of the tow olive cultivars. Trees were sprayed with calcium at 0.5% as calcium chloride (21% Ca) and chelated calcium. Results The results revealed that there were significant differences with calcium source treatment regarding number of inflorescences/shoot, no. of total flowers/inflorescences, sex expression, initial fruit set, final fruit set (%) and yield/kg (tree) and decreasing fruit drop (%) of olive oil Kalmata and Manzanillo cultivars compared with unsprayed in both seasons. Conclusions Results proved that olive trees sprayed at the end of December with 0.5% calcium as chelated calcium was the promising treatment for good flowering, fruit set, yield and fruit quality.