1. Bull, L., 1993. Residue and Tillage Systems for Field Crops, AGES 9310, Economic Research Service, U.S. Department of Agriculture, Washington, DC.
2. Conservation Technology Information Center, 1997. National Crop Residue Management Survey — 1997 Survey Results, West Lafayette, IN.
3. Dickey, E., Jasa, P., Shelton, D., 1992. Conservation Tillage Systems. Conservation Tillage Systems and Management. MidWest Plan Service, Iowa State University, Ames, IA.
4. The impact of conservation tillage on pesticide runoff into surface water: a review and analysis;Fawcett;J. Soil Water Conservation,1994
5. Foster, G., Dabney, S., 1995. Agricultural tillage systems: water erosion and sedimentation. Farming for a Better Environment. Soil and Water Conservation Society, Ankeny, IA.