Fig. 1. Map of the sampling location at Lerbjerg with kriged contours of soil clay content. The area shown is located approximately 20 m from the border of a field of approximately 20 ha. The positions of the sampling sites L1, L3, and L5 are shown together with those of the L2, L4, and L6 sites included in previous studies (e.g., Schjønning et al., 1999; Thomsen et al., 1999).