This study was carried out during 2020 and 2021 seasons to examine the effect of spraying Royal Jelly at 100 to 400 ppm and / or glutathione at 250 to 1000 ppm on growth and tree nutritional status of Ferehy date palms grown under Siwa Oasis conditions. Treating the tree Ferehy date palms three times with royal Jelly at 100 to 400 ppm and /or glutathione at 250 to 1000 ppm was very effective in stimulating length, width and area of leaflet, length and area of leaf, chlorophyll a, chlorophyll b, total chlorophylls, total carotenoids, total carbohydrates%, N, P, K (as %) Fe, Zn, and Mn (as ppm) in the leaves of Ferehy date palms over the control treatment. Carrying out three sprays during seasons study after hand pollination (middle of April), Just after fruit setting (middle of May) and two months later (middle of July) of a mixture of royal Jelly at 400 ppm and glutathione at 1000 ppm gave the best results with regard to growth and tree nutritional status of Ferehy date palms.
Keywords : Royal Jelly, Glutathione, Ferehy date palms, Growth, Nutritional status,
Received:6/2/2023 12:00:00 AM; Accepted: 8/1/2023 12:00:00 AM