We are trying to model erosion and deposition processes in ferralsols in the Cerrado Region Mato Grosso/Brazil using a process based simulation model. For that purpose we took soil samples and derived soil texture via sieve-sedimentation methods with previous mechanical dispersion via ultrasound. Due to high contents of iron oxides the soil is forming large amounts of aggregates in sand and silt fraction. Now we have problems simulating the initial and saturated soil water contents resulting mostly in sandy soil with van Genuchten PTF and Verreecken. On the contrary, simulating ksat using Campell is comparably easy. Does anyone have experience with this issue?
Hi Marcos, where in MT are you working ? We do have measured some SRWC curves in some regions of MT.
Moreover have a look on these works
BARROS, A. H. ; de Jong van Lier, Quirijn ; Maia, A.H.N. ; SCARPARE, F. V. . Pedotransfer functions to estimate water retention parameters of soils in northeastern Brazil. Revista Brasileira de Ciência do Solo (Impresso), v. 37, p. 379-391, 2013.
BARROS, A. H. ; de Jong van Lier, Q. . Pedotransfer functions for Brazilian soils. In: Teixeira, W.G.; Ceddia, M.B.; Ottoni, M.V.; Donnagema, G.K.. (Org.). Application of Soil Physics in Environmental Analyses. 1ed.Berlin: Springer International, 2014, v. , p. 1-.
Good luck
Wenceslau
I would be very cautious when using PTF cases such as yours. First indeed because of the high Fe/Al oxides content, getting the texture "right" is not easy. Secondly the field can still yield you "nice surprises", particularly where soils are suspectible to surface sealing - see the attached paper reporting field work in SE Tanzania, an environment very much like the Cerrado / Mato Grosso; Melhores
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