The discrete element method (DEM) is a numerical tool used for the modelling of granular materials. However, accurate predictions of material behaviour can only be made if the input parameter values are carefully selected. Several laboratory experiments were used to measure the bulk behaviour of corn grains and then used to calibrate the parameter values using a number of different strategies for spherical (with rolling resistance) and non-spherical particles (with and without rolling resistance). The contact stiffness was calibrated using a confined compression test, and the coefficients of sliding and rolling friction were calibrated using either the individual or combined results from a draw down, rotating drum and annular ring shear test. The results showed that the draw down test alone was sufficient to calibrate the coefficients of sliding and rolling friction, this was confirmed by the results from the rotating drum and shear tests. (C) 2020 Elsevier B.V. All rights reserved.