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Differentiating Soil Types Using Electromagnetic Conductivity and Crop Yield Maps

^a Dep. of Statistics (0439), Virginia Tech, Blacksburg, VA 24061
^b Dep. of Crop and Soil Environmental Sciences (0403), Virginia Tech, Blacksburg, VA 24061
^c Dep. of Soil and Crop Science, Colorado State Univ., Fort Collins, CO 80523
^d Dep. of Mathematics and Statistics, University of Miami (Ohio) Oxford, OH 45056
^e USDA-Forest Service, 11 Campus Blvd. (Suite 200), Newton Square, PA 19073-3200

View larger version (8K): [in a new window]   Fig. 1. Summaries of classification tree categorization. (a) Inverted "tree" structure for classifying observations with two explanatory variables, X1 and X2. (b) Partition of the observation space of X1 and X2 into classification regions. Values of X1 and X2 are hypothetical.

View larger version (47K): [in a new window]   Fig. 2. Order 1 soil survey map of the experimental site in the northern Virginia coastal Plain (Nicholson et al., 1998).

View larger version (57K): [in a new window]   Fig. 3. Classification partition for Bojac versus Wickham soil types using apparent electromagnetic conductivity (ECa) and 1999 no-till full-season corn yields. The classification of each rectangle is determined by whichever soil type comprises the majority of observations.

View larger version (54K): [in a new window]   Fig. 4. Classification partition for Bojac versus Wickham soil types using apparent electromagnetic conductivity (ECa) and 1999 no-till wheat yields The classification of each rectangle is determined by whichever soil type comprises the majority of observations.

View larger version (68K): [in a new window]   Fig. 5. Classification partition for Bojac 1, 2 versus Wickham soil types using apparent electromagnectic conductivity (ECa) and 1998 no till full-season corn yields. The classification of each rectangle is determined by whichever soil type comprises the majority of observations.

View larger version (76K): [in a new window]   Fig. 6. Classification partition for Bojac 1, 2 versus Wickham soil types using apparent electromagnetic conductivity (ECa) and 1999 no till full-season corn yields. The classification of each rectangle is determined by whichever soil type comprises the majority of observations.