1. Department of Water and Agricultural Resource Management, University of Embu, P.O. Box 6-60100, Embu, Kenya
2. Cortile Scientific Co. Ltd., P.O. BOX 34991-00100, Nairobi, Kenya
3. Kenyatta University, Department of Geography, P.O. Box 43844-00100, Nairobi, Kenya
4. Kenya Agricultural and Livestock Research Organization (KALRO), Muguga, P.O. BOX 30148–00100, Nairobi, Kenya
5. Department of Plant, Animal and Food Sciences (PAFS), Jaramogi Oginga Odinga University of Science and Technology (JOOUST), P.O. Box 210–40601, Bondo, Kenya