CHARACTERIZATION OF PORE SIZE DISTRIBUTIONS WITHIN SOILS BY MERCURY INTRUSION AND WATER-RELEASE METHODS

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Abstract
I measured and interpreted soil pore size distributions for undisturbed, oven-dried peds using mercury intrusion porosimetry. The pore size distributions were compared with those calculated from moisture release data. A correlation between water retention difference by water-release methods and water storage pore volumes (50 to 0.5 μ) by mercury intrusion was established with an R2 = 0.58 over a variety of soil texture and bulk density ranges. Most of the variation occurred for soil samples high in either sand or clay. In addition, root-restricting class limits were developed based on volume of root size pores (200 to 10 μ) within oven-dried peds that were large enough to permit root tip and root hair penetration. © Williams & Wilkins 1985. All Rights Reserved.

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