The 1980 edition of the "bluebook" is a compilation of data collected and analyzed throughout Minnesota. Information was contributed by personnel of the Department of Soil Science including Extension Soil Specialists, Scientists at the branch stations of Crookston, Grand Rapids, Lamberton, Morris, Rosemount and Waseca; the "Sand Plain" experimental sites; and Soils and Crop area agents. Associated personnel from the Soil Conservation service, the Soi1 and Water Research group of the SEA-USDA, the Tennessee Valley Authority, the Department of Natural Resources and the Departments of Agriculture also contributed information.
Some of the results are from 1979 experiments only and should be regarded on this basis. Since most data are from only 1979 studies, conclusions are not conclusive and are thus not for further publication without the written consent of the individual researchers involved.
Sincere appreciation is expressed for materials and/or financial assistance
or program support from several organizations including: Potash and Phosphorus Institute of North America, CENEX, Farmland, Midland Cooperatives and Howe Incorporated, Minnesota Crop Improvement Association, American Soybean
Association and Minnesota Soybean Research and Promotion Council, Minnesota Golf Course Superintendents Association, Minnesota Limestone Producers Association, Minnesota Plant Food and Chemicals Association, Minnesota Soil and Water Conservation Committee, Dow Chemical, Olin Corporation, Minnesota Wheat Council, Sugar beet Research and Education Board, The Minnesota Resources Commission, The Minnesota State Planning Agency, The Water Resources Research
Center of the Graduate School, the Staples Vo-Tech Institute, the Red River
Valley Potato Growers Association, the Tennessee Valley Authority and the
North Central Forest Experiment Station.
The investigators also greatly appreciate the cooperation of many county agents, farmers, technical assistants, secretaries and the representatives of the various firms and businesses who contributed time, land, machinery and materials and without whose support many of the results reported here would not have been possible.