Fig. 2. Organic carbon content (g kg^–1) before and after 7 yr of incubation for (a) soils and (b) soil–biosolid mixtures (amended soils). Error bars indicate 2x standard errors (n = 2). NO, Nahal-Oz; G4, Golan 4; G37, Golan 37; MM, Mitzpe Masuah; TR, Terra Rossa; NET, Netanya 6; DS, dune sand.