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Sequence Relationships of Loess-Derived Forested Planosols in Southeastern Iowa¹

ABSTRACT

According to genetic theory, the loess-derived soil series of southeastern Iowa can be arranged in a number of sequences. As for a number of other sequences studied previously, there is increasing clay in the B^t layer with decreasing loess thickness. The forested Planosols have an A₁(A_p)A₂B_gC₁ genetic horizon sequence. They have greater textural differences and a more abrupt boundary between the A and B horizons than any other sequence. In the forested Planosols, there is a secondary accumulation of N and organic P in the B horizon; the free Fe tends to accumulate in the A₂B transition layer.

¹ Journal Paper No. J-3264 of the Iowa Agr. and Home Econ. Exp. Sta., Ames, Iowa. Project No. 1151. Presented before Div. V, Soil Science Society of America, Nov. 14, 1956, at Cincinnati, Ohio.

² Professor of Agronomy, Southwestern Louisiana Institute, Lafayette, La., and Professor of Soils, Dept. of Agronomy, Iowa State College, respectively.

Received for publication September 30, 1957. Accepted for publication April 29, 1958.