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The Effect of Extractable Aluminum, Iron, and Silicon on Strength and Bonding of Fragipans of Northeastern Ohio¹

ABSTRACT

Pyrophosphate, oxalate, and HCl-acetylacetone extractions for Al, Fe, and Si were made on five soils with fragipans (Aeric Fragiaqualfs and an Aquic Fragiudalf) and two soils without fragipans (Aeric Ochraqualfs) from Ohio to evaluate the role of amorphous components in effecting bonding between soil particles of fragipans. The distribution of Al extractable in HCl-acetylacetone was found to coincide with the position of the fragipan and correlated positively at the 0.01 level with rupture strengths which are indicative of fragipan development. Rupture strengths of soil disks from fragipans were shown to decrease following treatment with HCl-acetylacetone as compared to water treatment alone confirming the removal of a bonding phase in the fragipan by HCl-acetylacetone. Although a number of features of fragipans are inherited from the parent material, evidence suggests precipitation of an amorphous phase at contact points between soil particles which imparts strength and brittleness observed in fragipans.

¹ Contribution from the Agronomy Department, Ohio Agricultural Research and Development Center, Wooster, OH 44691; approved for publication as Journal Article No. 18-78. 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. and 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.

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