1 indicated that all fractions except for C1 (at 20 ppm), C4 (at 20 ppm) and C5 (at 100 ppm) showed positive effects. In comparison with the control, plant height of corn treated with all the fractions of chitosan solution except for C1 (20 ppm), C4 (20 ppm) and C5 (100 ppm), were significantly taller than control. While the fraction of C1 (at 20 ppm), C4 (at 20 ppm) and C5 (at 100 ppm) on plant height are shown no marked different from control.