UNCERTAINTY OF SOILGRIDS TESTED ON 1 200 000 SOIL DATA FROM NATIONAL SOIL FERTILITY CONTROL

SoilGrids provides global predictions for standard numeric soil properties (soil organic carbon (SOC), bulk density, cation exchange capacity (CEC), pH, soil texture fractions, and coarse fragments) at seven standard depths (0, 5, 15, 30, 60, 100, and 200 cm). For this study, accuracy assessment of provided data for pH in water, pH in KCl and SOC are being tested. Testing the accuracy of SOC showed deviations from -50 to +25 g kg-1, i.e., the most common deviations from 0 to +10 g kg-1 of SOC. Observing that soil sampling and its chemical analysis at the national level are time-consuming, digital soil mapping is considered valuable for fast making decisions over a large-scale territory