Zonation of suitable regions for rain-fed wheat planting in Zanjan province by GIS

-fed planting can. In addition, determination-fed cultivation and their distribution of them in. It is possible to specify production potential of lands and to. In this, information about soils and lands, topography (including slope, aspect) and climate (type of climate, mean of precipitation and average of) of Zanjan province were studied. For this aim, climatic, slope and. A"er preparing the layers by combining the maps using3.2 and ArcGIS9.2 so"wares, regions were classied according to their-fed wheat cultivation, as follows: perfectly suitable regions S1), suitable regions (S2), regions with critical suitability(S3) and unsuitable(S4). Obtained results showed that out of 2216400 hectare lands in the-fed wheat planting, 5.6 (S2), 48.3 percent is with low suitability (S3), 46.1 percent is(S1) land for dry wheat cultivation.