International Institute of Tropical Agriculture2007-11-121991-04-012007-11-121991http://hdl.handle.net/10625/12497Text1 digital file (33 p. : ill.)Application/pdfenON-FARM RESEARCHFARMING SYSTEMSRESEARCH CENTRESAFRICA SOUTH OF SAHARARICECASSAVASWEET POTATOESSOIL FERTILITYFinal Technical Report