Wiltrud Durand1, Yacob Beletse2, David Cammarano3, Olivier Crespo4, C. Nhemachena5, Sue Walker6, Weldemichael Tesfuhuney7, M. Teweldemdhin8, M. Gamedze9, P. Gwimbi10, T. Mpuisang11, P. Bonolo8 and J. Jonas5, (1)Crop Science, Agricultural Research Council, Potchefstroom, South Africa, (2)Agricultural Research Council-Roodeplaat, Pretoria, South Africa, (3)James Hutton Institute, Dundee, Scotland, (4)Rondebosch, University of Cape Town, Cape Town, South Africa, (5)Human Sciences Research Council, Pretoria, South Africa, (6)University of Free State, Bloemfontein, South Africa, (7)University of the Free State, Bloemfontein, South Africa, (8)Polytechnic of Namibia, Windhoek, Namibia, (9)Swaziland Meteorological Services, Mbabane, Swaziland, (10)Lesotho National University, Maseru, Lesotho, (11)Botswana College of Agriculture, Gaborone, Botswana