عنوان مقاله [English]
Pistachio are one of the strategic and important horticultural products. In order to increase the quantitative and qualitative characteristics of pistachio trees, foliar spraying with vitamins is done in order to remove the limitations during the growth stages. The present study was conducted as a factorial experiment based on a randomized complete block design with 5 treatments and 4 replications. The treatments included vitamin thiamine with concentrations of 200 and 400 µ/l and niacin of 250 and 500 µ/l, and trees that were not given any of the above treatments were considered as controls. Foliar spraying was done in two stages (the first stage, 30 days after flowering and the second stage, 45 days after flowering). Characteristics such as leaf area, chlorophyll index, percentage of indehiscent, percentage of deformed fruits, fruit weight, number of fruits per cluster, cluster weight and yield were studied. The results showed that as a result of using thiamine 400 µ/l and niacin 500 µ/l, leaf surface, chlorophyll index, smile, fruit weight, number of fruits per cluster, cluster weight and yield at the stage of 45 days after full flower increased. Also, the percentage indehiscent, the percentage of blankness, and the percentage of deformed fruits have decreased as a result of the use of treatments.