International Fertilizer Development Center2007-11-121988-04-012007-11-121988http://hdl.handle.net/10625/3277Text1 digital file (29 p.)application/pdfenPHOSPHATESFERTILIZERSCULTIVATION PRACTICESFARMING SYSTEMSON-FARM RESEARCHANDEAN REGIONECONOMIC EVALUATIONFinal report / Farming Systems and Rock Phosphate : technical and economic options of phosphate rock utilization for Andean zone agricultureIDRC Final Report