In DPB, subsoiling had little effect
on reducing crop residue biomass and soil protection was generally
ensured in agreement with Cassel et al.(1995) and López-Fando
and Pardo (2012). By contrast, in CB, all crop residues were incorporated
into the soil during bed preparation in late winter leaving
loose soil devoid of protective cover and with a high risk of water
erosion at this time (Boulal et al., 2011a).