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Illinois Fertilizer Conference Proceedings

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Table 1. Soil pH, organic matter (OM), phosphorus (P), potassium (K), and nitrate-nitrogen concentration in the 0 to 12 inches layer at each of the four sites.

  Champaign DeKalb Joliet Monmouth
Character Corn Soybean      
pH 6.1 6.1 6.5 6.9 6.9
OM (%) 3.9 4.4 3.6 3.0 4.5
P (lb/ac) 24 25 40 72 20
K (lb/ac) 227 201 243 363 207
Nitrate-N (ppm) 9 14 13 14 12

For Champaign, the site was further divided into corn or soybean as the previous crop.

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