Modelagem da curva de retenção de água de Latossolos utilizando a Equação Duplo Van Genuchten

By Carla Eloize Carducci, G. C. Oliveira, Eduardo da Costa Severiano, W. M. Zeviani. 2011

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SUMMARY : MODELING THE WATER RETENTION CURVE IN OXISOLSUSING THE DOUBLE VAN GENUCHTEN EQUATION The clay fraction mineralogy and the granular structure of Oxisols in the Cerrado(Brazilian savanna) are the reason for the great volume of large pores as well as of extremelysmall pores, but no significant medium pore volume, resulting in low available water forplants. This study aimed to characterize and model the behavior of water retention in Oxisolswith different texture classes of the Cerrado region. Samples were collected from the Bwhorizon of 10 Oxisols under native vegetation. Water retention was measured at matric potentialsof 1, 2, 4, 6, 8, 10 kPa using a Richards plate, and the water retained in potentials of 1.500 and300.000 kPa determined by a thermocouple psychrometer model WP4-T Dewpoint PotentiaMeter. The double van Genuchten model was proposed to fit the experimental water retentiondata by non-linear fitting using software R 2.10.1. The relationship between the estimatedmodel parameters and the inflection point with soil texture properties was evaluated also bythe Pearson correlation test. Results indicated good fitting of the model and great predictionpower and correlation between the soil clay content and equation parameters (U

Subfields: Civil and Structural Engineering, Soil Science

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