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Abstract

To know the infiltration behavior is very important due to its application in the agricultural production, since it allows to define the operation of irrigation systems and to study the effects of different practices of soil use. The objective of present study was to determinate the spatial variability of the infiltration model parameters of Philip and Kostiakov, as well as its relation with the bulk density, soil particles density and the sand, lime and clay contents. The infiltration tests were made using double ting infiltrometers, in a rectangular grid of 5 x 8 points of sampling, spaced at separation distance of 20 m, among two moisture soil conditions. It was found that soil spatial variability and mainly the clay contents affect the spatial variability of the infiltration, showing that the parameters of Philip and Kostiakov model, not always adjusted to theoretical semivariogramas models. The model that fitted for all sampling points in the two moisture soil conditions was Kostiakov. The test presented limiting for the Philip model, when the soil water content is high, indicating that this model is not adequate in this andic soil.