This research was done determine the effect of increasing leonardite applications on dry matter yield and some nutrient element contents of rye (Secale cerale L.) plant. For this purpose a pot experiment was done in greenhouse conditions with three replications. Five leonardite doses (L0: 0 kgda-1, L1: 50 kgda-1, L2: 100 kgda-1, L3: 150 kgda-1 and L4: 200 kgda-1) were applied to pots before a one month sowing. Nitrogen (14 kg N da-1), phosphorus (8 kg P2O5 da-1 and potassium (5 kg K2Oda-1) applied to the each pot as NH4NO3 and KH2PO4 form. Rye (Secale cerale L.) plants were harvested 60 day after planting and dry matter yield and some macro and trace element (N, P, K, Ca, Mg, Fe, Cu, Zn and Mn) contents of plants were determined. According to the results, statistically significant increases of dry matter yield of plants were determined with increasing leonardite applications. On the other hand, increasing leonardite applications on N and Fe contents of rye (Secale cerale L.) plants were found statistically significant at the level of 5 %. But the effects of leonardite applications on other nutrient element contents were not found statistically significant.
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