Soil in Rapid City, as well as other places in West River, can be heavy and compacted in some places. Gardeners can add amendments but have to be careful not to add herbicides that can harm their plants. A horticulture specialist for SDSU Extension gives SDPB's Victoria Wicks some tips for safe soil amendments.
To see a USDA document touting radishes as a cover crop, click here:
https://www.nrcs.usda.gov/Internet/FSE_DOCUMENTS/nrcs142p2_022940.pdf
For more information on daikon radishes, click here:
http://sonomamg.ucanr.edu/The_Kitchen_Garden/Feature_Vegetables/Daikon/