Fig. 3. Cumulative dry matter (DM) yield as a function of defoliation frequency for 1995 through 1997. Fitted lines are calculated from the Gompertz growth model. Regression parameters for the equations are presented in Table 3. 2WK, clipped at 2-wk intervals to a 5-cm residue; S50, 10-cm canopy clipped to 5-cm residue; T75, 20-cm canopy clipped to a 5-cm residue; 6WK, clipped at 6-wk intervals to a 5-cm residue.