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Use of Wax Substrates in Root Penetration Studies¹

ABSTRACT

Basic information on root penetration into pressure pans is essential in soil compaction studies. The ability of plant roots to penetrate compacted zones may determine moisture effectiveness and nutrient availability on these pressure-pan soils.

The use of wax substrates for simulated plastic pans is discussed and evaluated. Physical characteristics of a number of commercially available waxes are presented.

In plant growth-chamber experiments using wax substrates, the ability of plant roots to penetrate depended upon the wax rigidity, the type of plant, and the density of the soil above the substrate.

¹ Contribution from Soil and Water Conservation Research Division, ARS. USDA, and Texas Agr. Exp. Sta. cooperating. Presented before the Western Society of Soil Science, June 17, 1959, at San Diego, Calif.

² Soil Scientists (Physics), Western Soil and Water Management Research Branch, SWCRD, ARS, USDA, Bushland, Tex., and Fort Collins, Colo., respectively.

Received for publication September 8, 1959. Accepted for publication November 24, 1959.