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Spatial Variability of Soybean Quality Data as a Function of Field Topography

I. Spatial Data Analysis

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

View larger version (69K): [in a new window]   Fig. 1. Soybean seed sampling locations along with transects for analyzing relationships between soybean protein or oil concentrations and topography, and elevation maps for the (a) DL98, (b) RF98, (c) WL198, (d) KN99, and (e) WL299 fields.

View larger version (25K): [in a new window]   Fig. 2. Sample variograms and variogram models for soybean protein concentration data of the DL98, RF98, WL198, KN99, and WL299 fields.

View larger version (25K): [in a new window]   Fig. 3. Sample variograms and variogram models for soybean oil concentration data of the DL98, RF998, WL198, KN99, and WL299 fields.

View larger version (40K): [in a new window]   Fig. 4. Protein concentration values plotted along with elevation ranges and curvatures for transects drawn in the north-south direction in the central parts of the DL98, RF98, and WL299 fields.

View larger version (15K): [in a new window]   Fig. 5. Protein concentration values plotted along with terrain slope for the transect drawn in the north-south direction in the central part of the WL198 field.

View larger version (15K): [in a new window]   Fig. 6. Experimental cross-correlogram for soybean protein concentration vs. elevation along with the cross-correlogram significance limit (P = 0.05), experimental cross-variogram for protein and elevation, and variogram for elevation range of the DL98 field.

View larger version (15K): [in a new window]   Fig. 7. Experimental cross-correlogram for soybean protein concentration vs. elevation along with the cross-correlogram significance limit (P = 0.05), experimental cross-variogram for protein and elevation, and variogram for elevation range of the WL198 field.

View larger version (15K): [in a new window]   Fig. 8. Experimental cross-correlogram for soybean protein concentration vs. elevation along with the cross-correlogram significance limit (P = 0.05), experimental cross-variogram for protein and elevation, and variogram for elevation range of the KN99 field.

View larger version (15K): [in a new window]   Fig. 9. Experimental cross-correlogram for soybean oil concentration vs. elevation along with the cross-correlogram significance limit (P = 0.05), experimental cross-variogram for oil and elevation, and variogram for elevation range of the WL299 field.