The present experiment entitled “Effect of foliar spray of boron and zinc on flowering, fruit set and quality of Olive (Olea europaea L.)” was conducted at Department of Horticulture, Naini Agricultural Institute, Sam Higginbottom University of Agriculture, Technology and Sciences, Prayagraj, during the session 2023 - 2024. The experiment was laid out in randomized block design with three replications, and the study consists of twelve treatment combinations including control. Total 12 treatments were tested and in each treatment 3 plants of different cultivars namely Arbequina, Coratina and Koroneiki were selected for research purpose. Cultivar Koroneiki was found to be superior in respect of the parameters Days to flowering, Number of flowers per panicle, Flower drop percentage, Days from flowering to fruiting, Fruit set percentage, Fruit drop percentage, Fruit diameter, Fruit length, Fruit weight, Fruit yield per tree, Fruit yield per hectare, Oil content and TSS of fruit. Followed by cultivar Arbequina. The lowest readings were recorded in T₀ Control (Water Spray) on the cultivar Coratina and among all the three cultivars.

Increase flowering, fruit yield was might be due to the application of Zinc as Indian soils are deficient of zinc.