Fig. 2. Measured and simulated cumulative forage dry matter (DM) yield of timothy grown under limiting N conditions (open symbols, broken lines) and nonlimiting N conditions (closed symbols, solid line) in six separate experiments. N0, N4, N6, N7.5, N12, and N18 represent 0, 4, 6, 7.5, 12, and 18 g N m^–2, respectively.