1. Bationo A, Kimetu J, Ikeera S, Kimani S, Mugendi D, Odendo M, Silver M, Swift MJ, Sanging N et al (2004) The African network for soil biology and fertility: new challenges and opportunities. In: Bationo A (ed) Managing nutrient cycles to sustain soil fertility in sub-Saharan Africa. Academy Science Publishers and Tropical Soil Biology and Fertility Institute of CIAT, Nairobi, pp 1–23
2. Bielders CL, Michels K, Bationo A et al (2002) On-farm evaluation of ridging and residue management options in a Sahelian millet cowpea intercrop. Soil quality changes. Soil Use Mgmt 18:216–222
3. Demelash M, Stahr K (2010) Assessment of integrated soil and water conservation measures on key soil properties in south Gonder, north-western highlands of Ethiopia. Soil Sci Evntal Mgmt 1:164–176
4. Fongod AGN, Mih AM, Nkwatoh TN et al (2012) Morphological and agronomic characterization of different accessions of sweet potatoes (Ipomoea batatas) in Cameroon. Inter Res J Agric Sci Soil Sci 2:254–245
5. Gachimbi LN (2002) Technical report of soil survey and sampling results: Embu-Mbeere Countys, Kenya. LUCID working paper series number: 9. KARI-kabete, Nairobi, Kenya