Effect of harvesting time on the physical, chemical and pulping properties of hemp, Cannabis sativa L.

grantor: University of TorontoExcessive overuse of forests has led to environmental degradation, which deserves urgent attention, by switching to non-forest fiber resources where possible. Hemp, a non-woody plant, has long been considered as a potential fiber source substitute for the pulp and paper industry. The primary aim of this study is to assess the physical, chemical and pulping properties of hemp with respect to the harvesting time, in order to determine the optimal growth point for harvesting. Hemp stems were harvested in the field at the end of 30 days, 60 days, 90 days and 120 days, and analysis conducted using standard TAPPI procedures to measure their properties. The hemp fibers were seen to exhibit similar properties as woody fibers. The optimum time to harvest the crop was found to be between 60-90 days, in order to achieve low lignin concentration and high pulp yield, resulting in optimal mechanical properties of the paper produced.M.Sc.F