1991 Proceedings: Contents1. A Historical Assessment of Crop Production and Chemical Use on Economically Viable Farms in Illinois (progress report)2. Spatial and Temporal Variability of Herbicide Retention in Soil During the Growing Season (progress report) 3. Groundwater Contributions to Atrazine Loadings in Streams (progress report) 4. Facilitated Transport of Agricultural Chemicals by Colloidal Materials (progress report) 5. Research on the Bulk Saturated Hydraulic Conductivity of Glacial Till (progress report) 6. The Occurrence of Agricultural Chemicals in Shallow-Bored and Dug Wells (progress report)
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