Two field experiments were performed in Sakha Agricultural Re­search Station during 1994/95 and 1995/96 seasons to study the ef­fect of three levels of phosphorus fertilizer (zero, 15 and 30 kg. P205/ fed.) and only one concentration (250 ppm.) for each of microelements (Zn., Mn., Fe. and their mixture) as foliar application on the yield, yield components and some technological characters of Giza 7 flax variety. In­creasing phosphorus levels from zero up to 30 kg. /fad. Significantly in­creased straw yield per faddan, fiber yield per faddan, long fiber percent­age, fiber fineness, upper branching zone length, number of capsules per plant seed yield plant as well as per faddan and oil percentage. Spraying flax plants with Zn. was significantly surpassed over other microelements in each of straw yield per plant as well as per faddan, fiber yield per fad­dan, long fiber percentage and fiber fineness. While Mn. significantly in­creased seed yield and its related characters except seed index which did not reach the level of significane. Significant interaction between P. levels and microelements were recorded in all straw yield and its related characters except on technical length. On the other hand, the interaction was significant in respect to all seed yield characters.