I Soil Survey Illinois Cooperative Soil Survey USDA Natural Resource Conservation Service Illinois Agricultural Experiment Station Office of Research Illinois Department of Agriculture Division of Natural Resources II Why Land Grant Universities III Soil surveys which include soil classification were initiated in 1899 To provide the missing link to permit the transfer of research plot data to farmer s fields Research stations obtain results from field plots but there was no assurance that new ideas could be transferred successfully from soil to soil IV How is a soil survey made By a soil scientist walking in the field assisted by air photo map an auger V Soil Surveys Predict soil conditions in certain areas and interprets them for practical uses 1 VI Soil genesis is the basis for soil survey Soil f climate vegetation parent material topography time VII Pedon and Polypedon A pedon is the smallest volume that can be recognized as a soil sample unit A polypedon is a soil body consisting of one or more contiguous pedons all falling within the defined range of a single soil series classification unit VIII Inclusion in map units Similar soils lie outside range of series and phases of named map unit but share common limits of these criteria with the named soil Includes Taxajuncts similar use and management interpretations Same family Parallel family members Segments of similar families 2 3 Soil Mapping Map based on soil landscape model On aerial photo base Map on county basis soil survey in Illinois Map scale in Illinois 1 15 840 Also regional national global soil maps More detail less area more area less detail 4 Soil Mapping Unit Appears on published county soil maps Example 171B2 Series 171 Catlin Slope Erosion Class 2 Moderate B 2 5 Published Soil Map of U of IL South Campus 5
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