A two years study was carried out during 2017-18 to investigate the effect of planting date and sowing depth on some qualitative traits, yield and water consumption efficiency of potato cultivars in autumn and spring cultivations in Ardebil, IRAN, as split factorial based on RCBD with three replicates. The main plots were sowing dates (1st of November and December and 30th of April) and factorial combination of potato cultivars (Esprit, Marfona, Savalan and Agria) and tuber sowing depths (10, 15, 20 and 25 cm) were considered as subplots. The results showed that iron content, tuber yield and water use efficiency affected by cropping date and nitrogen content, fat and fiber percentages and soluble sugars affected by sowing depths. Water consumption efficiency was higher by sowing Esprit cultivar in 1st of November and December at depths of 10, 15 and 25 cm.

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