CATION-EXCHANGE AS A FUNCTION OF ORGANIC MATTER, TOTAL CLAY, AND VARIOUS CLAY FRACTIONS IN A SOIL TOPOSEQUENCE

SOIL CATION-EXCHANGE CAPACITY /CEC/ AS DETERMINED FOR A AND B HORIZONS OF MIAMI, CELINA, CROSBY, AND BROOKSTON SOILS WAS STATISTICALLY PARTITIONED USING MULTIPLE LINEAR REGRESSION ANALYSES INTO THE FOLLOWING SETS OF COMPONENTS' /1/ ORGANIC MATTER /OM/ AND TOTAL CLAY, AND /2/ OM, 2-0.2 MICRONS, AND LESS THAN 0.2 MICRONS CLAY. COEFFICIENTS OF MULTIPLE CORRELATION /R/ FOR INDEPENDENT VARIABLES USED IN REGRESSION COMPONENTS /2/ ARE OF LARGER MAGNITUDE BUT NOT SIGNIFICANTLY DIFFERENT FROM COMPONENTS /1/. R VALUES FOR COMPONENTS /1/ RANGE FROM .76 TO .87 AND FOR COMPONENTS /2/ FROM .78 TO .92. ORGANIC MATTER CONTRIBUTES MOST TO THE CEC IN A HORIZONS WHEREAS LESS THAN 0.2 MICRONS CLAY CONTRIBUTES GREATEST TO THE CEC OF B HORIZONS FOR SOILS OF THIS TOPOSEQUENCE. WITH ONE EXCEPTION, 2-0.2 MICRONS CLAY IS NOT SIGNIFICANTLY CORRELATED WITH CEC IN EITHER A OR B HORIZONS. THE AVERAGE CEC OF OM FOR BROOKSTON A HORIZONS IS LOWER THAN FOR OTHER TOPOSEQUENCE MEMBERS /154 VS. CA. 200 MEQ/100 G/, WHEREAS FOR B HORIZONS IT IS CONSIDERABLY GREATER /361 VS. CA. 290 MEQ/100 G/. THE AVERAGE CEC OF FINE CLAY IN B HORIZONS PROGRESSIVELY INCREASES WITH DECREASE IN DRAINAGE CLASS, VARYING FROM ABOUT 70 MEQ/100 G IN MIAMI TO 121 MEQ/100 G IN BROOKSTON. /AUTHOR/

  • Supplemental Notes:
    • Vol 30, No 6, PP 782-785, 3 TAB, 17 REF
  • Authors:
    • Wilding, L P
    • Rutledge, E M
  • Publication Date: 1966-11

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  • Accession Number: 00237336
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 28 1994 12:00AM