ABSTRACT The experiment for to know the effect of to give hydrasil and interval of irrigation on the yield of potato (Solanum tuberosum) in middle land, had carried out at can, Impel, Boyolali, Central Java, An elevation 700 m above sea level, the soil type brown latosol, soil pH 6. Was carried out during in October 1988 until January 1989. This experiment used Split Plot Design, the arran…