Fertiliser trees for sustainable food security in the maize-based production systems of East and Southern Africa. A reviewFestus K. Akinnifesi, O.C. Ajayi, G. Sileshi, P.W. Chirwa and Jonas ChianuAgron. Sustain. Dev., 30 3 (2010) 615-629DOI: https://doi.org/10.1051/agro/2009058