more emphasis on the vertical soil variation, such as topsoil thickness (Kitchen et al., 1999) and depth of sand deposition (Kitchen et al., 1996).
Fields on morainic soils, which represent a significant proportion (>25 percent) of the areas used for cereal production in Norway, typically show high variability in texture and organic matter, both laterally and vertically. Nevertheless, most interest is normally paid to lateral variation in topsoil properties. Reasons for this are that such variation may be directly observed in the field, and that more quantitative information, such as soil analyses, usually exists for the upper layer than for those below. Using the EM-ECa technique, however, the effective measuring depth goes much deeper than the topsoil layer. Consequently, subsoil soil properties may affect the EM-ECa signal significantly. It is thus of interest to explore how soil variation in deeper layers affects such measurements. The objective of this study was to establish relations between measurements of ECa, soil texture, and ignition loss at different depths on two morainic soils in southeast Norway, in order to evaluate the suitability of the EM-ECa technique to map the texture and organic matter content of such soils.
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