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Spatial Variability of the Illinois Soil Nitrogen Test

Implications for Soil Sampling

Department of Crop Sciences, Univ. of Illinois, 1102 S. Goodwin Ave., Urbana, IL 61801

View larger version (31K): [in a new window]   Fig. 1. Geographic distribution of experimental sites. Squares represent adjacent fields where experiments were conducted in 2002 and 2003, triangles represent 2002 fields, and circles represent 2003 fields.

View larger version (10K): [in a new window]   Fig. 2. Soil sampling design for ISNT at A02. Detail of nested cell.

View larger version (22K): [in a new window]   Fig. 3. Maximum ordinary kriging standard error (SE) (mg kg–1) as a function of grid spacing (m) for the 2002 fields.

View larger version (18K): [in a new window]   Fig. 4. Maximum ordinary kriging standard error (SE) (mg kg–1) as a function of grid spacing (m) for the 2003 fields.