| Determination of clay content in a soil profile using electromagnetic induction technique |
| Paper ID : 1175-NICAME1402 |
| Authors: |
|
Lotfollah Abdollahi *1, Mogens H. Greve2 1Department of Agricultur, Payame Noor University, Tehran, Iran 2Department of Agroecology, Aarhus University, Research Centre Foulum, P.O. Box 50, DK-8830 Tjele, Denmark, |
| Abstract: |
| Effective soil resource management requires spatial information about key soil properties which affect soil functions. Clay content (fraction < 2 µm) is one of the most important soil properties. The aim of this research was to map topsoil clay content at fine spatial resolution over the Vindum field using DUALEM 21S, measuring electrical conductivity (Eca). Regular sampling campaigns are labour intensive and time consuming. Soil sensors like (DUALEM 21S) provide rapid and cheap information for mapping soil clay contents. In this study, the spatial relationship between clay content and EMI data to a depth of 2.5 meters will be investigated. The DUALEM 21S data analysed in a field of about 5 ha size in Vindum, Viborg, in Denmark. DUALEM (DUAL-geometry Electromagnetic) multi-separation geo-conductivity sensor simultaneously measures terrain-conductivity to four or six distinct depths of exploration (on the go). For calibration of sensor data, we will use 15 representative samples in the field to a depth of 2.5 meters. Latin Hypercube sampling was used to find the exact place of points for measuring ECe and sampling 15 representative points for clay determination. DUALEM data were inverted using an excel sheet from DUALEM company. Preliminary results showed that there is more than 80 percent correlation (R2=0.65) between clay content and DUALEM 21S data. Despite the high spatial variability in the Vindum field the good correlation between DUALEM data and clay content is promising. Our next study would be finding the correlation between clay content and EMI measurement in the subsoil layer. |
| Keywords: |
| Clay content, on the go mapping, soil sensors, DUALEM 21S |
| Status : Paper Accepted (Poster Presentation) |
