Nitrogen is one of the most important nutrients and a key factor in achieving optimum yield in crops. For this purpose, a study was performed on the effect of irrigation and the ratio of mixing nitrogen and Pelleted cow manure on some quantitative and qualitative characteristics of sunflower (the variety of Gabor) as a split plot test in randomized complete block with three replications. In this experiment irrigation is as the main factor in three levels of 6-12-18 days and the ratio of mixing

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... itrogen and Pelleted cow manure as a sub factor in three levels (120 Nitrogen +120 cow) , and (180 Nitrogen + 180 cow) and 300 kg N ha + the lack of using cow manure (control). The results showed that there was a significant difference at the 1% level between the levels of the main factor (a) in terms of the studied traits except oleic acid. Also, in terms of the levels of the sub factor (b) there was a significant difference at 5 and 1% probability level among other traits except Linoleic acid. In terms of the interaction of a × b a significant difference was observed only in terms of traits, Linoleic acid, Erucic acid, Palmitic acid, Butyric acid and oil percent. Seed and oil yield allocated the highest seed and oil yield in 6 days of irrigation and the lowest seed and oil yield in 18 days and the seed yield and oil yield at 18 days have reduced to 51.05%and 53.37% compared of irrigation per 6 days. in unsaturated fatty acids, the combination of 12 days irrigation × 30 nitrogen manure + without using cow manure constituted the highest rank. The combination of irrigation per 18 days, × 180 nitrogen manure + 180 cow manure allocated the minimum unsaturated fatty acid. However, in terms of saturated fatty acids the combination of irrigation per 18 days × 180 nitrogen manure + 180 cows manure is the best combination and the combination of irrigation per 6 days × 180 nitrogen manure + 120 cows manure had the lowest mean.