agro-ecological zoning of the qazvin area for wheat (triticum aestivum l.) using rs and gis

one of the effective tools for identifying land resources and assign them to the best and most profitable forms of land productivity, susceptibility of agro-ecological zoning . in this study agro-ecological zoning of satellite imagery and gis were used. after agro-climatic zoning (based on isorain, isothermal and length of growing period maps) and agro-edaphic zoning (based on soil, slope and land use maps), in total, 43 agro-ecological zoning were achieved. the climate, soil and topographic characteristics of the zone were compared with crop requirements for wheat and land suitability classes were determined using the parametric square root methods . the results showed that climate suitability classes for wheat are highly suitable (s1). based on squre root of almost 34/14%, 43/16%, 14/94%, 4/03% and 3/72% respectively in the classes land highly suitable (s1), moderately suitable (s2), marginally suitable (s3), unsuitable (n) and unstudied (ns( are. in addition, soil depth and gravel percentage in the northern part. also, salinity, alkalinity, lack of organic matter and gypsum are major limiting factors in the southern part area. potential yield of wheat was calculated using the fao method and amount of 6666 kg per hectare , respectively. also, land production potential in each of the zone was determined. this loss of yield due to the potential yield impact of limiting factors that modify management actions such as increased organic matter to the soil, land drainage and leaching can increase crop yield.