Foliar application of fruit set is done in order to decreasing premature fruit fall out and improvement of fruit trees on-off years. One of on-off years reason is early fall out of flowers before fertilization due to zinc and boron deficiency. Application of this fertilizer leads to decreasing flower fall out. This product contains nitrogen, zinc and boron and helps plant to save nutrients for next years. Nitrogen is one of the most important nutrients for plants which lead to improvement of plant growth and yield. Nitrogen presents in protein structure and since it is an important part of chlorophyll, it leads to photosynthesis improvement. Boron in plants plays role in formation of flower and leaf buds, seed and fruit formation, metabolism and transportation of sugars and carbohydrates. Zinc plays a major role in protein synthesis, starch synthesis enzymes production, metabolism, photosynthesis, and production of growth hormones.Elements which present in fruit set fertilizer (N, Zn and B) improve germination, pollen tube growth to reach to ovule and perform fertilization and lead to better flowering and seeding.Components such as amino acids and fulvic acid in this fertilizer are growth and root development stimulant and increase plant tolerance against environmental stresses. Deficiency symptoms of boron in plants results in twisting and spoon shape of leaves, hollow seed and less seed formation in clusters, which can be eliminate by application of this product in appropriate time (beginning of spring, bud swelling time).