zoning of canola cultivation based on climatic temperature needs using of gis in golestan province

studying of climatic elements  are one of the most important factors   influencing on agricultural crops  production and developing of agriculture activities in every region that led to increasing production . by studying of agro climatology  can be determined potential facilities in different areas  and used optimum of  facilities . this research was established  by determining  temperature potential  of  ecological capacity of canola cultivation areas in golestan province . climatic grouping by dumartin method, was established  to  general determine of region climate by using of suitable cultivation  temperature( 15-20°c) and vibul method ( 75% probability )is determined cultivation date .  based on measuring of effective required day degree in every steps , is measured given date to phenology  step .suitable and limited  temperatures  different steps of canola   phenology is derived from different sources  and measured its occurrence probability in studied region . medium relation ship of canola  performance  and suitable and limited temperatures was studied in different steps of phenology . after organizing and forming  of temperature layers using of regression equations , the cultivation regions are divided in to four areas , very desirable , desirable , rather desirable and undesirable .