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Nyathi, P ,  Kimani, S.K. ,  Jama, B. ,  Mapfumo, Paul ,  Murwira, HK ,  Okalebo, JR ,  Bationo, B. André ,  [Soil fertility management in semi arid areas of East and Southern Africa] ,  Soil fertility management in semi arid areas of East and Southern Africa

Kimani, S.K. ,  Nandwa, SM ,  Mugendi, DN ,  Obanyi, S.N. ,  Ojiem, J ,  Murwira, HK ,  Bationo, B. André ,  [Principles of integrated soil fertility management] ,  Principles of integrated soil fertility management