Avaliações de Funções de Pedotransferência para Solos Brasileiros

Pedotransfer Functions (FPT) are mathematical models that estimate difficult-to-measure soil properties through more accessible variables, generating optimization of time and financial resources. In this study, six Functions, based on the equation Van Genuchten, analyzed for prediction volumetric moisture Brazilian soils, with data from global database Soil Data Task. Applied pressures 0, 0.01, 0.03, 0.10, 0.20, 0.50, 2.50 15.0 bar, resulting values equations were compared measured moistures five statistical parameters: confidence index, mean square error, deviation ratio, modeling efficiency residual mass coefficient. Of functions studied it was possible to verify FPT proposed by Barros, 4 parameters, one presented best results, while Rawls Brakensied obtained lowest performance. It has been observed a is related two factors: a) similarity between pedological those used in development FPT, b) amount variables analyzed.