Two field experiments were performed at EL-Serw Agricultural Research Station, Damietta Governorate, Egypt, during 1997-98 and 1998-99 growing seasons, to study the influence of phosphorus fertilizer applied in two rates, 15 and 30 kg P₂O₅/fed. and soil additions of chelating iron and manganese at the rate of 2 kg elements/fed.  On the yield, yield components as well as both Fe and Mn uptakes of seeds and straw at maturing stage of oil seed rape plant (Brassica Napus L.) grown on soils differ in their natural salinity levels (EC of soil extracts were 1.4-1.9, 4.6-4.8 and 9.1-9.8 ds/m). The obtained results showed that increasing soil salinity levels induced a significant decrease in 1000 seeds weight, seed and straw yields per feddan, oil yield as well as both Fe and Mn uptakes of seeds and straw at maturity stage. Results showed that increasing phosphorus application rate up to 30 kg P₂O₅/fed. caused significant increases in 1000 seeds weight, seed, straw and oil yield.  Also, Mn uptakes of seeds and straw were increased, while Fe uptake of seeds and straw was significantly decreased with increasing phosphorus application rate in the two seasons.  The obtained results showed that the highest values of Fe uptakes of seeds and straw were obtained at the addition of chelating Fe, while the lowest values were obtained at the addition of Mn fertilizer alone.  Also, the highest values of Mn uptake were obtained at the addition of chelating Mn, while the lowest values were obtained from applying chelating Fe alone.