Parametric pedotransfer functions for predicting soil water retention in a Ngerengere Subcatchment, Morogoro -Tanzania
Abstract
99 words
The soil water retention-release characteristics (SWRC) are
essential to understand water redistribution in agricultural
systems. However, direct measurements of SWRC are
constrained by costs, scarcity of equipment and time.
Pedotransfer functions (PTFs) are proposed as a simplified
indirect alternative. The gist of this work was to assess the
efficacy of selected parametric PTFs for prediction of SWRC
based on the Van Genuchten parameters (θs, α, n). Lowest
prediction bias was for ès (ME; 0.0574 to 0.1249cm3cm-3).
Greatest prediction bias was for n (ME; -0.659 to 0.8521). The
PTFs showed low reliability (R2 <15%) necessitating
development of locally calibrated PTFs.
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