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Classification of Soils with Andic Properties from the Oregon Coast¹

ABSTRACT

Fourteen pedons from three northern Oregon coastal counties were evaluated for their chemical and physical properties for inclusion in the proposed soil order Andisol (Leamy, 1984). Seven pedons were found to meet the criteria for bulk density, aluminum solubility in ammonium oxalate (Al_o), depth, and phosphate retention, and were provisionally classified as Udands. Data for four representative pedons with andic properties are presented. Most of the measured Al_p/Al_o values for the andic horizons were >0.5 (Table 2), indicating that much of the Al is present in the form of humus-metal complexes. The relatively low values for oxalate-extractable Si suggest that these soils contain only small amounts of allophane and/or imogolite. These soils are similar to the nonallophanic, humus rich Udands that have been described in northeastern Japan. The proposed classification is discussed with respect to the guidelines presented in the 6th ICOMAND letter (Leamy, 1984).

¹ Contribution from the Oregon Agric. Exp. Stn., Oregon State Univ., Corvallis, OR 97331. Technical paper no. 7375.

² Assistant Professor and Professor of Soil Science.

Received for publication December 14, 1984. Accepted for publication January 4, 1985.