Eficiência de diferentes interpoladores no mapeamento de atributos físico hídricos do solo em área de produção agroecológica

Abstract

Different methods of interpolation was tested for soil physical hydric properties in a research area of agroecology production (SIPA) in Seropédica / RJ. The attributes tested was Field Capacity (FC), Easy Water Available (EWA), Available Water Capacity (AWC), Water at Tension of 80 KPa (80 KPa) and Wilting Point (WP). This attributes came from a dataset with values in three different depths: 0-10 cm, 10-20 cm e 20-30 cm. Ordinary Kriging (OK) and CoKriging (CK) methods was used as interpolators. The results obtained with OK were compared with those obtained by CK and KR to evaluate if there was improvement in the accuracy of the results. CK did not present viable results for validation in all combinations, showing little improvement over OK. The RK also did not result in gain of accuracy with the attributes tested. For the decrease of the number of samples the attributes 80 KPa and AFD were interpolated with OK and KR. There was no significant decrease in the accuracy of the results with the decrease for the proportions of 90%, 80%, 70%, 60% and 50% of the data. It is possible to interpolate the attributes with 50% of the total database used.