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The present research aimed to test pedotransfer functions developed for the Brazilian conditions identifying the model of the best adjustment in the determination of water retention on the Ferrasol of the municipality of Porto Velho-RO. The initial database consisted of the analytical results of RADAMBRASIL and SIGTERON, where was chosen the Ferrasol soil class. In order to improve the quality of the database, undisturbed soil samples were collected and in these samples physical attributes of the soil was determinated: granulometry, soil density, total porosity, macroporosity and microporosity, as well as water volumetric content retained at -0.006 And -0.01 MPa using tension table. The determined (observed) and predicted (through pedotransfer function FPT) data were compared graphically through the 1:1 ratio, as well as through statistical indicators: Pearson correlation coefficient (r2), mean error (ME) and root-mean-square error (RMSE). The pedotransfer function developed by Pequeno (2016) showed a regular accuracy to predict the water content retained. The pedotransfer function developed by Urach (2007) were the best fit for predicting the content and water retained in the edaphoclimatic conditions analyzed. Considering the behavior of the models tested, the quality of the data obtained, the regional peculiarities, this work allowed for the observance the need for development and validation of specific models for the local edaphoclimatic conditions, which may will show better adjustments and accuracy for to use on the estimating water retention on soil. * Contato com os autores: 1 e-mail: petrusdeluna@unir.br (P. L. L. PEQUENO ) Engenheiro Agrônomo, Doutor, Professor/Pesquisador, Fundação Universidade Federal de Rondônia/NT/DECIV. 2 e-mail: engenharia.flaviofagundes@gmail.com ( F.P. FAGUNDES ) e ( R. C. dos SANTOS ) Graduandos em engenharia civil pela Universidade Federal de Rondônia, UNIR. 3 e-mail: santini@unir.br (C. L. A. SANTINI) Engenheiro Mecânico, Doutor, Professor/Pesquisador, Fundação Universidade Federal de Rondônia/NT/DECIV. 4 e-mail: rambo@unir.br (M. A. RAMBO) Engenheiro Civil, Especialista, Professor/Pesquisador, Fundação Universidade Federal de Rondônia/NT/DECIV 5 e-mail: jairojas@unir.br (J. A. SCHLINDWEIN) Engenheiro Agrônomo, Doutor, Professor/Pesquisador, Fundação Universidade Federal de Rondônia/NCT/DEQUI ISSN: 2179-0612 DOI: 10.5216/reec.V14i2.51385 © 2018 REEC Todos os direitos reservados. P.L. L. PEQUENO; F. P. FAGUNDES; R. C. dos SANTOS C. L. A. SANTINI; M. A. RAMBO; J. A. SCHLINDWEIN REEC – Revista Eletrônica de Engenharia Civil Vol.14 no 2 (2018) 230

reec - revista eletrônica de engenharia civil

Uso de funções de pedotransferência para estimativa da retenção de água em um latosso no estado de rondônia [Use of pedotransfer functions for estimation of the water retention in Oxisol on the Rondônia state]