Tropical soils and fertiliser use

abonos abonos compuestos acid soils classification des sols compound fertilizers cropping systems crops cultivos engrais engrais organique fertilidad del suelo fertilisation fertilizer application fertilizers gestion du sol manejo del suelo organic fertilizers pedogenese plant soil relations plante de culture reconocimiento de suelos relaciones planta suelo relation plante sol sistemas de cultivo soil chemicophysical properties soil classification soil fertility soil genesis soil management soil surveys sol acide sol tropical suelo tropical tropical soils