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A Rupture Technique to Determine Fragipan Strength¹

ABSTRACT

A method is presented to evaluate the strength of fragipans based upon the rupture of 1.2 cm thick disks cut from air dry soil cores. Rupture values abruptly increase in the fragipan as compared to overlying horizons and decrease with depth in the lower B3 and C horizons. Rupture strength measurements may prove valuable in objectively assessing fragipan development and its subsequent influence on water movement and root penetration.

¹ Contribution from the Agronomy Department, Ohio Agricultural Research & Development Center, Wooster, OH 44691; approved for publication as Journal Article no. 17-78. Presented before Div. S-5, Soil Science Society of America, Houston, Texas, 30 Nov. 1976.

² Agricultural Technician 1 and Associate Professor of Agronomy, respectively, The Ohio Agric. Res. & Develop. Center and The Ohio State Univ. Senior author is now Assistant Professor of Soil Taxonomy, Department of Soils, Univ. of Florida, Gainesville.

Received for publication January 9, 1978. Accepted for publication September 11, 1978.