Conclusion
Chitosan oligomers effected significantly on the growth of coffee
seedlings under greenhouse conditions and in the field by
enhancing content of chlorophylls, carotenoid and mineral nutrient
uptake; increasing area of leaves, height and stem diameter
of plants. In addition, application of chitosan oligomer decreased
intensity of transpiration of the leaves. Under field conditions,
application of chitosan and chitosan oligomer increased mineral
uptake and the growth of braches. The growth stimulation of chitosan
oligomers led to a reduction in the rate of fallen fruit of coffee.
The appropriate concentration of chitosan and chitosan oligomer
for the growth and development of both coffee seedlings and production
coffee in the field was of 60 ppm.When applying the same
concentration, of chitosan oligomers had a greater effect on the
growth and development of coffee than chitosan.