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Title:Bulletin 811: Optimum Crop Productivity Ratings for Illinois Soils
Author(s):Olson, K.R.; Lang, J.M.
soil productivity
Abstract:Bulletin 811 provides crop yields and productivity indices under an optimum level of management used by the top 16% of farmers in Illinois in the 1990s. Prime agricultural land classes (Class A, Class B, and Class C) previously provided in Circular 1156 (Soil Productivity in Illinois) were not included in Bulletin 811. The prime agricultural class of any soil type can be determined by using the optimum productivity index (PI) shown in Table S2 of Bulletin 811 and the following author recommended prime agricultural class scale. Soil types with optimum PI's from 133-147 are in Class A, from 117-132 are in Class B, and from 100-116 are in Class C. Soil types in Bulletin 811 with optimum PI's equal to or below 99 are in the other agricultural land class and not considered prime agricultural land. If the soil type is in a soil map unit which is not on A slope or not slightly eroded, the user will need to determine if the soil type has a favorable or unfavorable subsoil for rooting (3rd column in Table S2 of B811) and make an erosion and/or slope adjustment using either Figure S1 (B811) or Table S3 (B811) prior to utilizing the scale and prime agricultural land class limits provided above.
Issue Date:2000-08
Publisher:Office of Research, College of Agricultural, Consumer and Environmental Sciences, University of Illinois
Genre:Technical Report
Publication Status:published or submitted for publication
Peer Reviewed:not peer reviewed
Rights Information:Copyright owned by Board of Trustees, University of Illinois
Date Available in IDEALS:2007-06-20

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