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This article in SSSAJ

  1. Vol. 55 No. 3, p. 787-794
     
    Received: Mar 22, 1990


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doi:10.2136/sssaj1991.03615995005500030026x

Predicting Cation-Exchange Capacity from Soil Physical and Chemical Properties

  1. L. A. Manrique ,
  2. C. A. Jones and
  3. P. T. Dyke
  1. 1290-D Maunakea St. 349, Honolulu, HI 96817
    Blackland Research Center, Texas Agric. Exp. Stn., Temple, TX 76502

Abstract

Abstract

Cation-exchange capacity (CEC) is an important soil property in describing nutrient availability for plant growth. Measurements of CEC, however, are often not available or have been measured using different analytical methods. The need, therefore, exists to develop alternative procedures to predict CEC from accessory soil properties. In this study, regression analysis was used to examine the relationships between CEC and clay (CLAY), organic carbon (OC), and other soil properties. Multiple regressions indicated that CLAY, OC, and soil pH accounted for up to 51% of the variation in CEC for all soil (n = 37921). For soil orders, CLAY and OC accounted for up to 67% of the variation in CEC for Alfisols, Inceptisols, Mollisols, and Vertisols, and up to 78% of the variation in CEC for Entisols and Spodosols. The OC alone accounted for up to 73% of the variation in CEC for Spodosols. Poor predictions of CEC resulted from CLAY for Aridisols and Vertisols, indicating that factors other than CLAY interfered with accurate predictions of CEC.

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