Evaluation of the effect of geographical aspects and fruit location within orange tree canopy on Sangin orange fruit quality

Orange (Citrus sinensis) is a subtropical fruit which grows in a wide range of climates. Radiation climate could affect physical and biochemical characteristics of fruit. Therefore، the aim of this research is to evaluate the effects of geographical aspects and fruit location within the canopy on orange fruit quality. A complete block design with split plots was employed to conduct this research in Sari vicinity، Semeskandeh، in 2012. Geographical aspects of north and south were assigned to main plots and location of fruit، deep within the canopy or sunlit، were assigned to subplots with three replications. The results showed that geographical aspect and fruit location significantly affected fruit anthocyanin and carotenoids. As fruit reached its ripening stage the a،b and a*b chlorophyll activity reduced. Both treatments had no significant influence on total soluble solids (TSS)، Titratable Acidity percentage (TA %) and the ratio of TA/TSS during the trial.