Bozkurt, SeferAgca, N.Odemis, B.2024-09-192024-09-1920081812-5417https://doi.org/10.3923/ja.2008.210.219https://hdl.handle.net/20.500.12483/14337A greenhouse study was carried out to determine the effects of different nitrogen sources and leaching practices on soil chemical properties. Tomato (Lycopersicon esculentum) was used as a test plant. All plots were fertilized equally for nitrogen, phosphor and potassium whereas nitrogen was applied at five different NH4+N/NO3-N ratios (N1 = 100/0; N2 = 75/25; N3 = 50/50; N 4 = 25/75; N5 = 0/100). No nitrogen applied plots (N 0) were also added to experiment. The changes and their relationships of soil soluble ions (Ca2+, Mg2+, Na+, K +, CO32-, HCO3-, Cl -, SO42-), EC and pH were determined in soil samples taken from three soil layers (0-5, 5-15 and 15-45 cm) at the beginning and the end of the study. Soil samples were also taken before and after the soil leaching to determine the effects of leaching on the parameters mentioned above. Soil pH had different correlations with N treatments among soil layers and showed rising trends with soil depths which had statistically significant differences at p<0.05 level in all treatments. Soil leaching caused statistically significant differences on soil pH at p<0.05 level. There were increases in EC values in all N treatments over the study period. However, soil leaching decreased soil EC values in all plots. All cations were affected by all treatments and their interactions. The study showed that the chemical properties of soil especially soil pH was affected by the forms of N fertilizers. © 2008 Asian Network for Scientific Information.eninfo:eu-repo/semantics/closedAccessAmmoniumECNitratepHSaltsArticle7321021910.3923/ja.2008.210.2192-s2.0-56549102915N/A