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The objective of this paper is to determine to what extent pedotransfer functions, PTFs, can be developed that have few coefficients and which are insensitive to soil type. The use of non-linear PTFs to predict penetrometer resistance of soils from their water status (matric potential, ψ and degree of saturation, S) and bulk density, ρ, appears to require that some other soil property, such as sand...
For this study penetration resistance (PR) was measured within the profiles of four Oxisols for a wide range of water contents (θ) and bulk densities. Obtained data were utilized to parameterize 23 previously applied regression models. The most promising models were selected to illustrate effects of soil texture on PR. Finally, a new correction method based on normalization of PR with θ corresponding...
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