Department of Plant Science
Soil test levels provide the best basis for recommending profitable rates of fertilizer to farms and ranchers. Summaries of soil tests can be used (a) to provide information about fertility levels of soils in a general area; (b) to show differences in fertility levels from one area to another; and (c) to follow changes in fertility levels for a period of years.
The objectives of this publication are to show soil fertility levels (a) for each soil association, (b) for each county and (c) to provide an example of how these values can be used when summarized by soil associations within a county.
South Dakota soil testing summary
South Dakota Agricultural Experiment Station, South Dakota State University
Ward, R. C. and Carson, P. L., "Fertility Levels of South Dakota Soils: A Summary of Soil Tests" (1975). Research Bulletins of the South Dakota Agricultural Experiment Station (1887-2011). 629.