This study investigates the effects of increasing doses of sewage sludge with Rhizobium inoculation on lentil (Lens culinaris Medic.) straw and grain macro, micro and heavy metal contents in 2003-2004 and 2004-2005 growing seasons. Experiment was conducted as a randomized complete block design with 3 replications. At the end of the study, it was seen that Rhizobium inoculation affects the N, Mg, and Pb contents of the lentil straw on by P<0.05, P and Ca contents by P<0.01 in the first year; the N, Fe, and Zn contents on P<0.05 level, on the Pb content P<0.01 level in the second year. Lentil grains were affected only on the K, Fe, Pb, and Cd contents by P<0.05. Sewage sludge applications were used to detect the effects on the N, Mg, Fe, Mn and Cu contents of the lentil straw by P<0.01, Co content by P<0.05, and Pb content by P<0.01 in first year; on the N, K, Zn and Pb contents by P<0.01, P and Mn contents by P<0.01, on the Mg, Fe, Cu, and Co contents by P<0.05 in the second year. Effects received by the lentil grains are as follows: The N, K, and Cu contents by P<0.01, on the Pb, Fe, P, and Mg contents by P<0.01, on the Ca and Zn contents by P<0.05 in the first year; on the P, K, Ca, Mg, Fe, Mn, Zn, Cu and Co contents by P<0.01, on the Pb content by P<0.05 in the second year. The effects of inoculation on the lentil straw and grain, regarding the nutrient and heavy metal contents were determined to be insignificant. This result may be a result of weak inoculation application and the heavy metal content of the sewage sludge, as well as the negative effects of Rhizobium inoculation.