Abstract
Abstract. In this investigation, meteorological data have been received from synoptic stations based on daily, monthly, and annually trend from Iran Meteorological Organization (IMO) at Razavi Khorasan Province and then homogeneity of data has been explored by (Wald- Wolfowitz) Run Test. Methodology of the research is of statistical descriptive type. Data analysis was carried out by means of Growing Degree Day (GDD) technique and method of Deviation from Optimum Percentage (DOP) plus phenology index within environment of statistical software (EXCEL and SPSS). Under agro climatic conditions, the results of this survey the early March to the late April are the best calendar for cultivation of potato month in all the aforesaid stations. Time of harvesting potato crop is Early August to the late September. substation. With respect to the phenological method, dates of cultivation until budding, flowering, and the end of flowering stage and maturation start respectively sooner in Mashhad substation than other stations in this region. The average annual temperature change results in model LARS WG Razavi Khorasan shows an increase of 2.13C° that this increased temperature does not affect the cultivation potato plant. The results showed that the mean rainfall in the study area will have reduced of about 6.43 mm this reduced rainfall reduced potato yield in the region.
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