1. Tanzania Agricultural Research Institute (TARI), Mlingano Centre, Tanga, Tanzania
2. Department of Soil and Geological Sciences, Sokoine University of Agriculture, Chuo-Kikuu, Morogoro, Tanzania
3. Department of Agricultural Engineering, School of Engineering and Technology, Sokoine University of Agriculture, Chuo-Kikuu, Morogoro, Tanzania
4. Department of Biology, University of Copenhagen, Universitetsparken 4, Copenhagen, Denmark
5. Department of Research and Development, Tanzania Agricultural Research Institute (TARI), Dodoma, Tanzania