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Root Growth in Cores Formed from Fragipan and B2 Horizons of Hobson Soil¹

ABSTRACT

The effect of changes in acidity and bulk density of cores formed from B2 and fragipan horizons of a Hobson soil on probe penetration and pea root growth were evaluated. Increasing soil pH in the range of 4.2–6.5 had no measurable effect on probe resistance, but resulted in greater root length in both B2 and fragipan samples. Probe penetration resistance increased as bulk density was increased. The silty clay loam B2 horizon was more resistant to probe penetration than the sandy loam fragipan when compared at the same bulk density and moisture tension. Root length was more closely related to probe penetration resistance than to bulk density. Root growth in both B2 and fragipan soil decreased as probe resistance increased from 10 to 20 bars and essentially stopped in soil where probe penetration resistance exceeded 20 bars.

¹ Contribution from the Missouri Agric. Exp. Stn., Columbia, Mo. J. Ser. no. 7989, approved by the Director. Supported by the Dep. of Interior, Office of Water Resour. Res., Project A-087-Mo. Administered through the Missouri Water Resour. Center.

² Professor, Research Assistant, and Soil Scientist, ARS-USDA in the Department of Agronomy, Univ. of Missouri, Columbia, MO 65201.

Received for publication November 8, 1977. Accepted for publication January 14, 1978.

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