Chemical maps of green manure particles (GM) before and after 180 days of incubation. The top row shows the distribution of the alkyl ratio of POM predicted from weighted averaged models. The distribution of C/N in POM predicted from weighted averaged models is represented on the second row. The bottom row contains RGB colour images (normalised against the reflectance target) of soil material with POM. The depicted areas correspond to a limited portion of soil cores and are presented as examples. T0: beginning of the incubation, T1: end of the 180-day incubation. top: topsoil, sub: subsoil