Report of the meeting on soils and fertilizers for the Latin American region - Raleigh, North Carolina, Usa, 1-11 Aug 1960.

abonos cartografia cartographie cartography classification des sols engrais exigence des plantes experimentation extension extension activities fertilidad del suelo fertilisation fertilizer application fertilizers gestion du sol manejo del suelo necesidades de las plantas plant requirements reconocimiento de suelos soil soil classification soil fertility soil management soil surveys sol suelo vulgarisation