In order to evaluate the effect of irrigation on seed yield, oil and protein content of peanut (Arachis hypogaea L.), an experiment was conducted in the form of a completely random block plan with three replications in Gilan province for 2013 and 2014. The main treatments included no irrigation (dry farming) and irrigation frequencies of 6 days, 12 days, and 18 days, and the secondary treatments included Nitrogen fertilizer at levels of 0, 30, 60, and 90 kg/ha. The study determined that the interaction of irrigation and nitrogen fertilizer with oil and protein content was significant at level of 5 percent confidence. The effect of irrigation on seed yield was significant at 1 percent, and the highest amount of seed yield was observed at 6-day frequency of irrigation with an average of 2665/8 kg/ha.

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