Fig. 2. Time taken to progress from 100% milk line to physiological maturity (0% milk line) in four corn hybrids in 4 yr (1999–2002). The horizontal line in each figure indicates the 50% milk line (i.e., the ideal stage for silage harvest). Hybrids Pioneer 37M81, Maizex Leafy 4, and TMF94 were grown in all years while Max 86 used in 1999 and 2000 was replaced with N.K. Enerfeast I (non-Leafy silage corn) in 2001 and 2002.