However, the question is: Can these relationships be used to map herbicide-soil binding variability across a field? Each field was mapped into high and low foc zones (Figure 15.1) based on results from the regression tree classification of the ECa and foc relationship. The validation soil data were used to test the resulting maps. The results were good, although not perfect (Table 15.2). As expected, the Kd of the three herbicides followed the foc. On average, the herbicides bound less tightly to soil samples taken from the low foc zones compared to soils from the high foc zones (Table 15.2). These results indicate that if a relationship between foc and ECa exists, ECa maps could be used to map herbicide soil binding variability across a field.

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