Subsoil hydraulic conductivities of major New Zealand soil groups at water contents near field capacity

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Abstract
Hydraulic conductivities at tensions of 100 and 200 cm of water were determined on undisturbed samples from the subsoils of 18 New Zealand soils. Values at 100 cm ranged from 10-5 to 10-2 cm/h and some soil groups had distinctive values of conductivity. As tensions increased to 200 cm of water, hydraulic conductivity decreased most for the soils that had the greatest conductivities at a tension of 100 cm of water. Conductivities predicted from pore-size distributions fell within a narrower range than measured conductivities, and ratios of measured to predicted conductivities (“matching factors”) were significantly less for soils of small predicted conductivity than for soils with high predicted values.

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