1. Department of Agricultural and Rural Engineering, University of Venda, University Road, Thohoyandou, 0950, Limpopo, South Africa
2. Bioresources Engineering Programme, School of Engineering, University of KwaZulu-Natal, King Edward Ave, Scottsville, Pietermaritzburg, 3209, KwaZulu-Natal, South Africa
3. School of Agricultural, Earth and Environmental Science, University of KwaZulu-Natal, King Edward Ave, Scottsville, Pietermaritzburg, 3209, KwaZulu-Natal, South Africa