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Measurement and prediction of water movement in a field soil: The matrix-macropore dichotomy

✍ Scribed by K. R. J. Smettem; P. J. Ross

Publisher
John Wiley and Sons
Year
1992
Tongue
English
Volume
6
Category
Article
ISSN
0885-6087

No coin nor oath required. For personal study only.

✦ Synopsis

The saturated and unsaturated flow properties of a field soil under two tillage treatments were obtained with ponded rings and disc permeameters of dissimilar radii. No difference was observed between tillage treatments but the flow properties displayed a distinct macropore-matrix dichotomy, with K changing by an order of magnitude as Yo went from just -30 mm to zero.

Accurate prediction of time to incipient ponding was achieved using both numerical and analytical models calibrated with field hydraulic properties that were characteristic of the soil matrix. However, extension of the numerical model to the prediction af the wetting front development under non-ponded conditions was less accurate due to localized preferred wetting.

It is hypothesized that at this site, localized concentration of rainfall and hence, preferred wetting, may occur by inlerception and stemflow associated with lines of standing stubble present in the original seeding slots.

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