1. Department of Agronomy, University of Agriculture, Faisalabad 38040, Pakistan
2. Department of Crop and Soil Sciences, Washington State University, Pullman, WA 99164, USA
3. African Sustainable Agriculture Research Institute, Mohammed VI Polytechnic University, Laayoune 70000, Morocco
4. CIRAD, SENS, F-34398 Montpellier, France
5. SENS, CIRAD, IRD, University Paul Valery Montpellier 3, University Montpellier, 34090 Montpellier, France