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Relationship between Exchangeable and Boiling Nitric Acid-Extractable Potassium in Seventy-Five West Virginia Soil Series¹

The relationship between exchangeable K and boiling HNO₃ extractable K was determined in 75 West Virginia soil series varying in mode of development and in chemical properties. Contents of each form were related to topographic position, soil series, parent material, cation exchange capacity, pH, and K fixing capacity. Amounts of each form were significantly higher in limestone soils as a group than in non-limestone soils. Neither form was closely related to either topographic position or series. Potassium fixing capacity was significantly related to topographic position, however. for all soils as a group both exchangeable and boiling HNO₃ extractable K were closely related to cation exchange capacity and pH, but there was considerable variation among topographic positions and parent material classes. Exchangeable K correlated poorly with K fixing capacity in all soils as a group. Both significantly positive and negative r values were obtained on the basis of topographic position and parent material. Boiling HNO₃ extractable K appeared to relate more closely with K fixing capacity in all soils as a group. There was generally good correlation between exchangeable and boiling HNO₃ extractable K in the aggregate and among the topographic groups and parent material classes. Bottomland soils differed, however, in that all r values were negative with those for the group and the non-limestone class being significantly so. These negative r values are attributed in part to the relatiw:ly higher organic matter content of the Bottomland soils.

Key Words: topographic positions • parent material • cation exchange capacity • pH • K fixing capacity • regression analyses • organic matter • weathering • alluvium

² Assistant Professor of Agronomy, Department of Agronomy and Genetics, West Virginia University, Morgantown 26506.

Received for publication April 15, 1968.