Study the infiuence of planting density and nitrogen fertilization on growth yield and its attributee in addition to fiber and seed quality of two flax cultivars i.e. bielnka and giza 5,and the nutritional requirements, in particular nitrogen, for this particular crop to get the most economical yield and the best fiber quality.an optimal planting density should be affecting either seed and fiber yield of flax. in addition, with the increase in use of commercial fertilizers for flax, there was a need for experimental dat for wis guidance concerning the planting density.