1. South African Sugarcane Research Institute Private Bag X02 Mount Edgecombe 4300 South Africa
2. College of Agriculture, Engineering and Sciences, Bioresources Engineering University of KwaZulu‐Natal P/Bag X01 Scottsville 3209 South Africa
3. PICWAT PO Box 11632 Universitas 9321 South Africa
4. Department of Soil, Crops and Climate Sciences University of the Free State PO Box 339 Bloemfontein 9300 South Africa
5. Van's Lab, Populier no 2, Bainsvlei Bloemfontein South Africa