b'3Mapping soil texture variability of the root zone with a newtransient electromagnetic system (tTEM) Madsen KS1, Vangs BI1, Vilhelmsen TN2, Christensen S and Brgesen CD1 1Department of Agroecology, Aarhus University, Blichers All 20, 8830 Tjele, Denmark 2Department of Geoscience, Aarhus University, Hegh-Guldbergs Gade 2, 8000 Aarhus C,Denmark Modelling is often used to acquire information of water and nutrient fluxes in the root zone.The models require detailed information of the texture in order to produce accurate estimations and reduce uncertainty on prediction. Soil texture can vary considerably even on field scale and is cumbersome and expensive to map in details with texture sampling. This study investigates if a new transient electromagnetic system (tTEM) (Auken et al., 2018) has enough information in its measurement to delineate the soil textural variations of the root zone. The study has focus on the clay fraction of the textural composition, as it is one of the maindrivers for water and nutrient movement. Electromagnetic induction (EMI), tTEM and soil textural surveys were carried out on two agricultural fields in Denmark. The geophysical data was processed and inverted. A direct comparison between the two types of geophysics in the close proximity of the textural sampling locations have been made. The two individual geophysical data sets are also compared to the clay content in the texture samples and the quality of therelationship is determined. The comparisons between the geophysical methods show varying degrees of correlationbetween the values and the quality of the relationship is dependent on the field. However,interpolation of the geophysical data provides contours with almost identical patterns. The new system was found useful in identifying zones of similar textural composition, but it has difficulties in predicting the exact clay content of the soil. References: Auken E, Foged N, Larsen J, Valdemar Trllund Lassen K, Maurya P, Mller Dath S, & TolstrupEiskjr T (2018). tTEMa Towed TEM-system for Detailed 3D Imaging of the Top 70 meters of the Subsurface. GEOPHYSICS, 84, 137. https://doi.org/10.1190/geo2018-0355.1 47'