Effects of physiographical factors on some qualitative and quantitative characteristics of Pistacia vera L. at Khajeh Kalat forest in Khorasan Razavi province

This study was carried out in the Pistachio forests of Khajeh Kalat with an area of 6393 ha. In order to study the effect of physiographical factors (aspect, slope and altitude) on qualitative and quantitative characteristics (crown area, viability and vigority) of pistachio, a land survey was conducted. Sampling performed by 48 plots in random design established on overlaid maps of aspect, slope, altitude, created by GIS softwares. Results showed that slope, aspect and altitude have significant effect on crown area of pistachio. Aspect and slope showed significant effect on pistachio vigority. Results also showed slope, aspect and altitude had no significant effect on viability.