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Potassium and Magnesium Recovery from Selected Soils of the Allegheny Plateau¹

ABSTRACT

Many soils of marginal land areas in the northeastern United States have been depleted in K and Mg by either poor soil fertility management or erosion. These soils also contain clay minerals such as mica and vermiculite that are prone to fix K and Mg. The combination of depleted levels of K and Mg and clay minerals may have an adverse effect on the recovery of K and Mg applied to these soils. The objective of this study was to determine the effect of clay minerals on the recovery of K and Mg applied to A and B horizons of seven Appalachian soils.

The recovery of K and Mg applied to the A and B horizons of seven soil series common to the Allegheny Plateau region of western Pennsylvania and northern West Virginia was determined using 1N ammonium acetate, double acid (0.05N HCl in 0.025N H₂SO₄), and oat seedlings. Potassium recovery by all methods ranged from approximately 60% of applied K in soils containing small amounts of mica and/or vermiculite to approximately 15% in soils containing moderate amounts of these clays. Almost all of the applied Mg was recovered by the soil testing methods, while the oat seedlings were only able to recover about 4% of the applied Mg. Recovery of Mg was not directly affected by clay type.

The ammonium acetate method was able to predict the recovery of K by the oat seedlings better than the double-acid method. Magnesium recovery by the oat seedlings was predicted equally well by both soil testing procedures.

¹ Contribution no. 8117 from the U.S. Regional Pasture Research Lab., University Park, PA 16802, and from The Appalachian Soil and Water Conservation Research Lab., USDA-ARS, Beckley, WV 25801.

² Research Soil Scientist, U.S. Regional Pasture Research Laboratory, University Park, PA. 16802.

Received for publication October 8, 1981. Accepted for publication June 4, 1982.

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