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See detailTransposability of pedotransfer functions for estimating water retention of Algerian soils
Touil, Sami; Degré, Aurore ULg; Chabaca, Mohamed Nacer

in Desalination and Water Treatment (in press)

Testing the efficiency of a pedotransfer function (PTF) outside of its development data-set is one of the best ways for assessing its robustness. An important question which remains unanswered is how ... [more ▼]

Testing the efficiency of a pedotransfer function (PTF) outside of its development data-set is one of the best ways for assessing its robustness. An important question which remains unanswered is how transposable are PTFs to other agropedoclimatic contexts? Models developed and validated in a particular pedoclimatic context have been relatively little tested in other contexts. Particularly, no studies have been conducted until now to evaluate the PTFs for Algerian soils. In this study, eight (8) PTFs most frequently cited were considered. We used them to evaluate soil water retention at field capacity (FC) and wilting point (WP) on a set of 134 samples collected in the low Cheliff. The calculated Akaike information criterion and root mean square errors values showed that the Rawls, and Ghorbani Dashtaki et Homaee type 1 models were the best in estimation of soil water retention at FC (–709.795, 0.070 cm3 cm−3) and WP (–733.480, 0.064 cm3 cm−3). The poorer performances were presented by the PTFs developed on soils from Europe or United States where the organic matter values were much higher than the Algerian soils. However, the transposability of the PTFs formed from data spread from a wider area, produce more accurate predictions than those built from local data. [less ▲]

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See detailTransposability and evaluation of pedotranfer functions for predicting properties of water retention on soils of low chelif. Algeria
Touil, Sami; Saidi, Djamel; Degré, Aurore ULg

Poster (2012, July)

An important question remains about PTF’s transposability to others agropedoclimatic contexts. Models developed and validated in a particular bioclimatic context, were relatively little tested in other ... [more ▼]

An important question remains about PTF’s transposability to others agropedoclimatic contexts. Models developed and validated in a particular bioclimatic context, were relatively little tested in other contexts. The evaluation of PTF to estimate water retention at field capacity pF 2.5 (-330 hPa) and at wilting point pF 4.2 (-15000 hPa) of some soils of Lower Cheliff is presented. [less ▲]

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