Ion activity products in soil solutions; Effects of aeration on reactivity and mobility of soil constituents; Physical processes influencing water and solute transport in soils; Chemical transport modeling:Current approaches and unresolved problems; Spatial soil variability and mass transfers from agricultural soils; Assessing nitrogen movement inthe field; The movement of phosphorus in soil; The movement of micronutrients in soils; Principles of salt movement in soils; Irrigation management and crop production as related to nitrate mobility; Principlesof microbial processes of chemical degradation assimilation, and accumulation; Incorporation of the Rhizosphere into plant root models; Sorption and movement of pesticides and other toxic, organic substances insoils; Mobility of radionuclides in soil systems; Movement of Heavy metals in soils; Movement of phosphorus and nitrogen in soil following; Application of municipal wastewater; Management of soil systems for industrial wastes.