The study occurrence time of the phenological stages of agricultural products based on thermal conditions is important. In this study, firstly the relationship between climatic parameters and potato yield was studied based on multivariate regres - sion method. In the following, time of occurrence phonological stages, cropping calendar, and deviation from optimal tem- perature were determined based on daily temperature statistics from 1989 to 2014. Based on the thermal gradient between low and highlands, the temperature up to 3000 m was estimated. The results showed that there is a significant relationship between temperature components and potato yield. The topographic condition determined the completion time of the thermal units required for potato plant phenology phases. In the study area from the easterly areas to the rugged Western regions, the planting time of 1 month is delayed. The first and last phases of potato plants, called sprouting–leaf development and flowering–ripening, require the smallest and most effective thermal units, respectively. For the sprouting, leaf development, inflorescence emergence, and ripening were 437, 692, 540, and 1126, growth degree days, respectively, required. Estimation of air temperature based on the least-squares regression showed that for the 1000 m height, 1 month of optimum temperature of potato cultivation was delayed.
International Journal of Environmental Science and Technology – Springer Journals
Published: May 31, 2018
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