Two field experiments were conducted at Gemmeiza Res. Station, Gharbia Governorate, Agric. Res. Center during  the two successive seasons of 2005/06 and 2006/07 to study the eight NPK treatments i.e., 1- control (zero), 2- 45 kg N/fed, 3- 15kg P₂O₅/fed, 4- 24 kg K₂O/fed, 5- 45 kg N + 15 kg P₂O₅/fed, 6- 45 kg N + 24 kg K₂O₅/fed, 7- 15 kg P₂O₅ + 24 kg K₂O/fed and 45 kg N +15 kg P₂O₅ + 24 kg K₂O/fed on yield and yield components of the two flax varieties Sakha 3 and Sakha 1, in addition to simple correlation coefficients among eight flax characters.  Results obtained can be summarized as follow: The flax variety Sakha 3 achieved maximum estimates in straw yield/fed as well as per plant, plant height, technical length and stem diameter when compared with Sakha 1. At the same time, Sakha 1 surpass Sakha 3 in fruiting zone length, seed yield/fed as well as per plant, no. of capsules/plant, no. of seeds/capsule and no. of apical branches. Moreover, application treatment. of NPK at the levels 45 kg N + 15 kg P₂O₅/fed produced maximum mean values of straw and seed characters under this study. The correlation coefficients among straw yield/plant exhibited significant positive correlations with each of plant height, technical length, stem diameter, no. of capsules/plant, no. of seeds/capsule and no. of apical branches. Also, no. of capsules/plant exhibited significant positive correlations with each of no. of seeds/capsule and no. of apical branches.