1. Council for Scientific and Industrial Research ‐ Savanna Agricultural Research Institute P.O. Box TL 52 Tamale Ghana
2. Dep. of Agronomy Kansas State Univ. 2701 Throckmorton PSC, 1712 Claflin Road Manhattan KS 66506 USA
3. Dep. of Biosystems Engineering and Soil Science Univ. of Tennessee 605 Airways Blvd Jackson TN 38301 USA
4. Dep. of Agriculture Nutrition and Human Ecology and Cooperative Agricultural Research Center College of Agriculture and Human Sciences Prairie View A&M Univ. P.O. Box 519, MS 2008 Prairie View TX 77446 USA
5. Sustainable Intensification Innovation Lab Kansas State Univ. 108 Waters Hall, 1603 Old Claflin Place Manhattan KS 66506 USA
6. Council for Scientific and Industrial Research ‐ Crops Research Institute P.O. Box 3785 Kumasi Ghana