Obtaining soil hydraulic properties for water balance and leaching models from survey data. 2. Hydraulic conductivity

Smettem, K.R.J.; Bristow, K.L.

Australian Journal of Agricultural Research 50(7): 1259-1262

1999


ISSN/ISBN: 0004-9409
DOI: 10.1071/ar97075
Accession: 003513311

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Abstract
A simplified physico-empirical model to estimate the 'matrix', or textural saturated hydraulic conductivity, Km, using estimates of the bubbling pressure derived entirely from clay content data that are readily available in soil surveys. Model estimates were compared with in situ measurements on surface soils obtained using a disc permeameter with a negative pressure head at the supply surface of 40 mm. Results were satisfactory for broad-scale water balance and leaching risk models that require specification of a matching point for the unsaturated hydraulic conductivity function and for modelling applications requiring generalized application of results from experimental sites.