A pot experiment was conducted during the summer season 2011/2012 in the greenhouse of the Atomic Energy Authority, Nuclear research center, Soil and water Research Department. A complete randomized design with four replications was used in this study. A combination of four phosphorus levels (0; 50; 100; and 200 kg P₂O₅ fed^-1 as superphosphate with four levels of potassium fertilizer levels (0; 25; 50 and 100 kg K₂O fed^-1 on growth, nodules and nutrients of the Leucaena leucocephala. Shoots and roots dry weights were gradually increased with increasing potassium rate up to 100 kg K₂O fed^.-1, where it accounts for 61.85,9.59,71.17 g pot^-1  for shoot, root and whole plant, respectively, while addition of sole phosphorus induced an increase of the dry weight of roots and shoots up to the rate of 100 kg P₂O₅ fed^-1, (111.8, 15.61, 127.41 g pot^-1  for shoot, roots and whole plant, respectively), and then tended to decrease for the same sequence. Maximum shoot dry weight (197.43 g pot^-1) was achieved by addition of 100 kg P₂O₅ fed^-1 combined with 50 kg K₂O fed^-1.The maximum number and dry weight of nodules were detected with P-K(100-50) (3.13 g pot^-1), while  the  minimum detected with P-K (0-0) (1.14 g pot^-1). Moreover, all the nodules were distributed on secondary roots. Nitrogen uptake was enhanced by the addition of phosphorus and potassium and gradually increased by increasing rates of both of them.