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Measuring the Hydraulic Conductivity of Soil Horizons with Continuous Macropores¹

ABSTRACT

Measurement of K_sat of soil horizons with continuous macropores is discussed. Different fluxes at grad H = 1 cm cm^–1 and zero pressure head ranged from 2,000 to 10 cm day^–1 in the B21g (clay) of a Typic Fluvaquent with vertical worm channels and from 20 to 1 cm day^–1 in the Clg (compact sandy loam) of a Plaggeptic Haplaquod. Fluxes were obtained using (i) large detached columns (K_sat entire soil), (ii) columns that were attached to the subsoil, and (iii) detached columns with light crusts on top [K_sat of the soil matrix, which is referred to as K_(sat)].

¹ Contribution from the Netherlands Soil Survey Institute, Box 98, 6700 AB Wageningen, The Netherlands.

² Dep. of Soil Physics, Neth. Soil Survey Institute.

Received for publication May 4, 1981. Accepted for publication October 20, 1981.

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