Plant crops of all varieties tested attained maximum quality (Pol % juice) at 19 MAP (Figure 5), indicating that harvesting operations beyond 19 MAP may not be economical because there may be cane and sugar losses due to stalk death especially for varieties D 8484 and KEN 83-737. Plant crop maturity of variety Co 421 at 19 MAP was contrary to a general perception that it was of late maturity (20 - 24 MAP) (KESREF 2007), and that it maintains its quality over long period of time.