Fig. 5. Vertical profiles of (a) wet density and (b) gravimetric water content in the sunflower field (P1) recorded in July 2003, January 2004, and March 2004, and (c) wet density and gravimetric water content in the grassland field (P2) recorded in February 2003, July 2003, March 2004, and May 2004 (straight line = simplified dry water content profile, dashed line = simplified wet water content profile).