MANAGEMENT ZONES RELIABLE FERTILIZER MAPS FRACTIONATION OF PHOSPHORUS SOIL QUALITY PREDICTIVE MODELING GEOSTATISTICS DEGRADATION OF SOIL STRUCTURE CLASSIFICATION MODEL MACRONUTRIENT SOIL NUTRIENTE TESTING PRECISION AGRICULTURE PROXIMAL SOIL SENSING SITE-SPECIFIC MANAGEMENT COVER CROP PRINCIPAL COMPONENTS ANALYSIS COCUMIS MELO RESIDUAL PHOSPHORUS SOIL COMPACTION NUTRIENT STATUS ECA SENSORS PHOSPHORUS FRACTIONS SOIL MANAGEMENT SOIL SPECTROSCOPY SOIL SAMPLING REMOTE SENSING CAATINGA PRESCRIPTION MAPS INTERPOLATION SOIL PENETRATION RESISTANCE DIGITAL SOIL MAPPING SOIL HEALTH