Average PI s of Selected Illinois Soils Bulletin 810 Illinois Soils Soil Productivity Ratings and Farmland Assessment Professor Kenneth R Olson NRES and ACES University of Illinois Adjusted PI s of Grantsburg Soil Grantsburg soil no 301 PI 90 For 301 C2 Unfavorable subsoil for rooting 7 slope moderate erosion Wakeland soil no 333 Farm and Individual Soil PI s PI 114 Adjusted PI 114 0 80 91 PI s of Illinois Soils on a farm With 100 acres of Grantsburg silt loam soil map unit 301 C2 with unfavorable subsoil for rooting 7 slope moderate erosion And 100 acres of Wakeland silt loam soil map unit 333 favorable subsoil for rooting 1 slope slight erosion frequently flooded with 2 years of crop loss in 10 years 127 114 90 43 For 333 Favorable subsoil for rooting 1 slope slight erosion 2 years of crop loss in 10 years PI 130 Adjusted PI s of Wakeland Soil Adjusted PI 90 0 88 79 Assume a 200 acre farm Soil type Muscatune silt loam no 51 Drummer silty clay loam no 152 Wakeland silt loam no 333 Grantsburg silt loam no 301 Romeo silt loam no 316 Individual soil method Recommended method Wakeland soil no 333 91 Grantsburg soil no 301 C2 79 Tract or whole farm PI no longer used PI would be 100 ac 91 9100 PI would be 100 ac 79 7900 Average Tract PI for 200 ac 17 000 200 85 1 Certified Value of Illinois Ag Land Muscatune soil no 51 PI 130 Certified EAV value 330 ac Wakeland soil no 333 PI 114 Certified EAV value 126 ac Grantsburg soil no 301 PI 90 Certified EAV value 19 ac Certified Value of Illinois Ag Land Individual soil method Wakeland soil map unit 333 with 2 years crop loss PI 91 Certified EAV 22 ac Grantsburg soil map unit 301 C2 PI 79 Certified EAV 8 ac Farm 200 acres assessed value 22 ac 100 ac 8 ac 100 ac 3000 farm or 15 ac Soil Productivity B810 average level of management B811 optimum level of management Crop Yields checked by field measurements 18 000 acres on 1400 parcels 3 to 5 years of corn and soybean yield data on 90 soil types under optimum level of management Field check yields were 10 12 bu ac higher for corn and 3 to 4 bu ac higher for soybeans than in B810 yields Field check yields were 3 5 bu ac lower for corn and 1 3 bu ac lower for soybeans than B811 yields 2
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