Recent attention has been focused on toxic levels of selenium (Se), arsenic, chromium, mercury, boron and molybdenum (Mo) accumulating in saline agricultural evaporation pond waters. Although this is an effective disposal practice for agricultural drainage water, the ponds attract wildlife and waterfowl which may create adverse environmental risks. There is a major concern with the Mo content in these saline waters and its effect on the upper food chain. Molybdenum can be fixed in soil or liberated into soil solution and become available for biotic uptake. Molybdenum is a metallic element that can exist in different valences and oxidation states. Oxidation and alkaline conditions favor Mo mobility. The objective of this study was to determine the effect of various organic materials on the solubilization and mobilization of molybdenum in soil.