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Soil Electrical Conductivity and Topography Related to Yield for Three Contrasting Soil–Crop Systems

^a USDA-ARS, Cropping Syst. and Water Qual. Res. Unit, Columbia, MO 65211
^b Veris Technol., 601 N. Broadway, Salina, KS 67401
^c USDA-ARS, Water Manage. Unit, Ft. Collins, CO 80523

View larger version (51K): [in a new window]   Fig. 1. Apparent soil electrical conductivity maps of the study fields.

View larger version (29K): [in a new window]   Fig. 2. Actual (right) and neural network (left)–estimated yields for the Kansas 1999 site-year.

View larger version (51K): [in a new window]   Fig. 3. Three-year yield response to shallow (ECa-sh) and deep (ECa-dp) apparent soil electrical conductivity modeled by neural network analysis for (top left) Missouri, (top right) Kansas, and (bottom) Colorado fields.

View larger version (31K): [in a new window]   Fig. 4. Yield response to deep apparent soil electrical conductivity (ECa-dp) and slope for the Kansas 1999 site-year based on (left) neural network and (right) multiple quadratic regression including two-way linear interactions models.

View larger version (19K): [in a new window]   Fig. 5. Scatter plot and boundary line of yield vs. deep apparent soil electrical conductivity (ECa-dp) for Colorado in 1997 to 1999. Points represented with triangles are yield data above the 95th percentile for each 60-point increment (or bin) of ECa data.

View larger version (22K): [in a new window]   Fig. 6. Scatter plot and boundary line of yield vs. deep apparent soil electrical conductivity (ECa-dp) for Kansas in 1997 to 1999. Points represented with triangles are yield data above the 95th percentile for each 60-point increment (or bin) of ECa data.

View larger version (21K): [in a new window]   Fig. 7. Scatter plot and boundary line of yield vs. deep apparent soil electrical conductivity (ECa-dp) for Missouri in 1997 to 1999. Points represented with triangles are yield data above the 95th percentile for each 60-point increment (or bin) of ECa data.

View larger version (24K): [in a new window]   Fig. 8. Scatter plot and boundary line of yield vs. elevation for (left) Kansas 1999 soybean, (middle) Missouri 1997 corn, and (right) Missouri 1999 soybean. Points represented with triangles are yield data above the 95th percentile for each 60-point increment (or bin) of elevation data.