All corn plants treated with chitosan began flowering earlier than control. Figure 4 presents the effect of different
molecular weight and mixed molecular weight of irradiated and unirradiated chitosan on average number of corn ear
after 80 days of planting. The result presented in figure 4 shows that the higher number of ear corn was observed for
all treatments of chitosan in all concentrations compared to the control. Comparable among chitosan treatment, the
C1, C2 and C3 treatments that contained lower molecular weight chitosan gave higher number of ear corn than C4,
C5, C6 and C7 treatment that contained higher molecular weight chitosan. However, in relation to number of ear
corn, the effect of concentration of each treatment was not significant due to the uncontrol of the volume of chitosan
solution sprayed onto corn plants.