4. Conclusions
Preliminary agricultural test on corn plant were performed in pots. The results show that irradiated and
unirradiated chitosan at concentrations ranging from 20, 50 and 100 ppm are effective for the growth promotion of
corn plant, such as plant height, number of ear and ear size, in comparison with the control (untreated chitosan). The
biggest growth was observed for degraded chitosan (molecular weight 30,000 – 50,000 Da) in concentration of 100
ppm. The results clearly demonstrated that lower molecular weight (below 50,000 Da) of irradiated degraded
chitosan effectively stimulates the growth of corn plant.