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This study aimed to verify the viability of virtual samples within a set of some soil samples, as subsidies for sampling grid plan to be used in geostatistical analysis. Were selected, randomly, 16 soil samples (0-20 cm and 20-40 cm depths) from original dataset, with objective to realize the external validation. Was applied the Thiessen polygons procedure based on remaining original soil samples (34 samples), and then were inserted, randomly, virtual samples (66 samples). The variogram analysis, cross validation, ordinary kriging and external validation were executed after. The insertion of virtual samples showed viable itself, once that SDI (Spatial Dependence Index) and cross validation for soil attributes were improved, situation that not occurred for these soil attributes considering 50 original samples. Furthermore, results showed that the maximum distance for soil sampling in this study must be assumed in 1,500 m. The external validation obtained good results, indicating that sampling (100 samples) could be used for sampling plan for geostatistical analysis, since that consider the field restrictions.

Amostras Virtuais no Planejamento Amostral de Atributos do Solo de Uma Bacia Hidrográfica