Soil Fertility Status of Soils in Illinois

Fabián G. Fernández, Bhupinder S. Farmaha, Emerson D. Nafziger

Research output: Contribution to journalArticlepeer-review


Our objective was to survey the phosphorus (P), potassium (K), pH, calcium (Ca), magnesium (Mg), and organic-matter (OM) levels of soils in Illinois, including the degree of nutrient vertical stratification. Soil samples were collected from depths of 0-8 and 8-18 cm in 547 randomly chosen fields throughout Illinois and analyzed for nutrients, pH, and OM. Forty-six percent of samples were below the critical range for K (130 to 150 mg K kg-1), and 59% of samples were above the soil P levels, requiring no additional fertilization. Soil pH ranged from 4.7 to 8.1. Mean Ca and Mg levels were nonlimiting for crop production, and OM was correlated (R2 = 0.690) with corn grain yield. Vertical stratification (surface/subsurface ratio) was 2.4:1 for P and 1.5:1 for K. Many fields with greater than needed P levels and less than suggested levels for K present opportunities for improvement in fertilizer management.

Original languageEnglish (US)
Pages (from-to)2897-2914
Number of pages18
JournalCommunications in Soil Science and Plant Analysis
Issue number22
StatePublished - Nov 2012


  • Fertilizer rates
  • nutrient stratification
  • soil fertility

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Soil Science


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