Illinois Soils and Productivity Ratings Professor Kenneth R Olson Department of NRES University of Illinois Soil Mapping Unit Appears on published county soil maps Example 171B2 Series 171 Catlin Slope Erosion Class 2 Moderate B 2 5 1 Soil Taxonomic Classification Soils are classified based on the presence or absence of diagnostic horizons and major differences in soil forming factors or properties Alfisols Mollisols Ap Ap E Bk Bt C C Ap 0 to 7 inches Soil Temperature Regimes A 7 to 14 inches BA 14 to 19 inches Bg 19 to 25 inches Btg1 25 to 32 inches Btg2 32 to 41 inches 2Btg3 41 to 47 inches 2Cg 47 to 60 inches Typic Endoaqoll Drummer silty clay loam Illinois State Soil 2 Moisture Regimes Soil Productivity B810 average level of management B811 optimum level of management Table 1 Average Management Drainage Soil pH Available phosphorus Available potassium Table 1 Average Management con t Nitrogen rates per year of corn or legume equivalent Plant population Crop residues Weed and insect control Based on soil test and depending on yield goal 90 175 lbs ac 22 000 to 30 000 plants ac Returned to soil timely Sufficient 5 8 to 6 2 for grain 6 0 to 6 9 for alfalfa and clover Based on soil test and depending on yield goal 40 50 lbs ac Based on soil test and depending on yield goal 240 300 lbs ac Table 1 Average Management con t Tillage planting operations Soil erosion Moldboard plow or conservation tillage 2 slopes conservation tillage including not tillage for 2 to 10 slopes within soil tolerances using conservation practices as needed 3 4 5 6 7 8
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