TROPISCHE BÖDEN + SUBTROPISCHE BÖDEN (PEDOLOGIE); LATERITBÖDEN + OXISOLE + LATOSOLE + ROTERDEN + FERRALSOLE + LATERISATION + FERRALLITISATION (PEDOLOGIE); MOBILITÄT UND VERFÜGBARKEIT VON BODENINHALTSSTOFFEN (BODENCHEMIE); PHOSPHOR + PHOSPHORVERBINDUNGEN (BODENCHEMIE); ISOTOPENMARKIERUNG UND ISOTOPENAUSTAUSCHREAKTIONEN (CHEMIE); TROPICAL SOILS + SUBTROPICAL SOILS (PEDOLOGY); LATERITIC SOILS + OXISOLS + RED SOILS + LATOSOLS + FERRALLITIC SOILS + FERRALLITIZATION + LATERIZATION (PEDOLOGY); MOBILITY AND AVAILABILITY OF SOIL COMPONENTS (SOIL CHEMISTRY); PHOSPHORUS + PHOSPHORUS COMPOUNDS (SOIL CHEMISTRY); ISOTOPE LABELLING AND ISOTOPE EXCHANGE REACTIONS (CHEMISTRY)