Fig. 1. Experiment layout at the Saint-Lambert-de-Lauzon site, showing the plots sizes and treatments, the tile lines, and the access chambers. The drained surface for each plot was 750 m² (1998) and 600 m² (1999) for cow manure–reduced tillage (CM–RT), 1500 m² (1998) and 1200 m² (1999) for CM–conventional tillage (CT), and 1200 m² for mineral fertilizer (MF)–CT, MF–RT, pig manure (PM)–CT, and PM–RT. See text for details concerning the changes in the drained surface for CM plots.