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A new method to estimate the field capacity is presented. For its application, it is enough to know the soil water retention curve data for each depth and to adjust the Van Genuchten’s equation to them in order to obtain the independent parameters (α, m, n, θr and θs) of the equation. By using the “THETACC” BASIC program and the parameter values obtained, field capacity can be estimated for some specified rate of internal drainage (τ). The value of τ (= 0,01.Ks) was able to estimate the field capacity for both homogeneous and heterogeneous soils.

NOVO MÉTODO PARA ESTIMATIVA DA UMIDADE DO SOLO NA CONDIÇÃO DE CAPACIDADE DE CAMPO