When conducting a soil survey, how does USDA map the soil in a field?

Sonya Volcko: You can find this information in online soil surveys posted at http://soils.usda.gov/survey/printed_surveys/. The printed surveys contained a "How This Soil Survey Was Made" section. On the http://soils.usda.gov/survey/printed_surveys/ page, choose a state, then choose a soil survey that has a date, open the "Manuscript" link, open the bookmarks, and read the "How This Soil Survey Was Made".Note: Disregard the reference to the specific county, the processes are basically the same from survey to survey....Show more