Zonation of Late Chilblain Risk Impacts on Gardens Case Study:Mahvalat Region

Mahvalat region with about 3734 square km area is located in the center of Khorasan-Razavi province. This region is one of the major center of agriculture productions like pistachio, pomegranate and saffron.In this paper temporal and spatial curves of spring chilblain is drawn with using the Geographical Information System (GIS) facilities. These curves are described chilblain in two thresholds; gentle chilblain (temperature between 0-1 degree) and severe chilblain (temperature below zero degree)and drawn for probability levels of 50, 75, 95, 99 percent with regard to adjacent stations and applying of correlation coefficient with elevation of the region.By superposition of these curves with ending date of hibernation in the dominant gardens varieties, the zonation of c chilblain risk for gardens was done.In the regions that the occurrence date of latest critical temperature is after the ending date of hibernation of trees, the region is classified as a high risk zone and vise versa.The results of overlying maps suggested 3 zones; high risk, risk and low risk zone.We are abled by interpreted these maps to predicting the occurrence date of chilling types and make decision a suitable methods to confront of chilling injury in the region.