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¹ Ankara Üniversitesi, Ziraat Fakültesi, Tarla Bitkileri Bölümü, Ankara, Türkiye DOI : 10.21566/tarbitderg.501440 - This research was carried out in the experimental fields of Ankara University, Faculty of Agriculture, Field Crops Department between the years of 2013 and 2014, to observe the effect of different fertilizer doses on the yield and quality parameters of fiddleneck (Phacelia tanacetifolia Benth.). The research was set up in 3 replicates compatible with split parcel experimental design tecnique in random blocks. Three different fiddleneck varieties (Sağlamtimur, Stala, Enton) were sown to main parcels and 5 different nitrogenous fertilizer doses (0 kg/da, 2.5 kg/da, 7.5 kg/da, 10 kg/da) were applied to sub-plots. Plant height, fresh herbage yield, hay yield, dry matter yield and crude protein yield are recorede in the experimental. CV Stala were found superior regarding it`s plant height (72.65 cm, 84.76 cm), fresh herb yield (2138.00 kg/da, 2385.60 kg/da), hay yield (510.83 kg/da, 554.60 kg/da), dry matter yield (456.55 kg/da, 495.99 kg/da) and crude protein yield (72.92 kg/da, 76.43 kg/da) in 2013 and 2014. The nitrogen dose for a high-yield and high-quality production was determined as 10 kg/da. Keywords : Fiddleneck, fresh herb yield, nitrogen fertilizing, quality