The use of apparent electrical conductivity to map the variation in fields has been around for several decades (Corwin and Lesch, 2003) and several studies have shown that there can be a statistically significant correlation between EC and various soil physical, chemical, and biological properties (e.g., Corwing and Lesch, 2003; Johnson et al., 2003). However, there isn’t a clear or standardized use of apparent EC to develop N management zones within a corn field. What we will describe here is a simple approach to using apparent EC data, with targeted soil sampling, to identify with soil properties are the best upon which to alter N rates within a field.
Soil Science Extension
University of Wisconsin Madison