Total irrigation amount changed from 102 to 302 mm and from 88 to 268 mm in 2000
and 2002, respectively. Seasonal evapotranspiration changed between 226 and 473 mm and 166 and
391 mm in 2000 and 2002, respectively. SD and SSD irrigation methods did not result in a significant
difference on yield. However, SD method has more advantages than SSD method, which has
difficulties in replacement and higher system cost. Irrigation levels resulted in significant difference
in both years on yield and its components. Water stress significantly affected the yield and yield
parameters of early potato production.Water deficiency more than 33% of the irrigation requirement
could not be suggested.