Fig. 2. Changes in soil organic C (SOC) in five soil types modeled using RothC growing cereals at three N inputs. Current fertilizer-N usage(——); Current fertilizer-N usage: -50 kg N ha^-1(- - - -); Current fertilizer-N usage: -100 kg N ha^-1 (......); High start sands (- · - · -); x axis = years from start of simulation; y axis = SOC g kg^-1; (a) = silt, (b) = sand, (c) = clay, (d) = chalk, and (e) = light.