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<) Bt horizon: 24% clay [40% Vermiculite, 60% Smectite ], 1.0% OM: 40 vermiculite = .096 and 24 kg -60 smectite = .144 kg 140 gmels/kg = 13.44 cmolc. 24 kg 096 kg 144 kg 175 = 25.2 cmalc 0.01 kg 250 = 2.5 goals

<) Bt horizon: 24% clay [40% Vermiculite, 60% Smectite ], 1.0% OM: 40 vermiculite = .096 and 24 kg -60 smectite = .144 kg 140 gmels/kg = 13.44 cmolc. 24 kg 096 kg 144 kg 175 = 25.2 cmalc 0.01 kg 250 = 2.5 goals

Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
Problem 1LR
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5) Calculate the CEC (in cmol/kg soil) for the following soil horizons. (An example is in the lecture slides) Organic matter = 250 gmol/kg, Vermiculite = 140 cmolc/kg, Smectite = 175 cmplc/kg a) A horizon: 18% clay [50% Vermiculite, 50% Smectite], 2.2% OM: 18 kg 09 kg 09 kg [02 kg M 50 vermiculite = .09 and .18 kg 50 smectite = .09 kg 140 gmolc/kg = 12.6 cmolc 175 = 15.75 cmplc 250 = 3.85 gmol. 13 Total = 32.2 goala ke soil b) E horizon: 16% clay [50% Vermiculite, 50% Smectite], 0.5% OM: 16 kg 50 vermiculite = .08 and .16 kg * .50 smectite = .08 kg .08 kg * 140 gmalc/kg = 11.2 cmplc. 08 kg 175 14 cmpl 005 kg 250 = 1.25 emplc Total = 26.45 gols/kg soil c) Bt horizon: 24% clay [40% Vermiculite, 60% Smectite], 1.0% OM: 24 kg 40 vermiculite = .096 and -24 kg -60 smectite = .144 kg 4 096 kg 140 gmol/kg = 13.44 cmolc. 144 kg 175 = 25.2 emalc 0.01 kg * 250 = 2.5 goold
Transcribed Image Text:5) Calculate the CEC (in cmol/kg soil) for the following soil horizons. (An example is in the lecture slides) Organic matter = 250 gmol/kg, Vermiculite = 140 cmolc/kg, Smectite = 175 cmplc/kg a) A horizon: 18% clay [50% Vermiculite, 50% Smectite], 2.2% OM: 18 kg 09 kg 09 kg [02 kg M 50 vermiculite = .09 and .18 kg 50 smectite = .09 kg 140 gmolc/kg = 12.6 cmolc 175 = 15.75 cmplc 250 = 3.85 gmol. 13 Total = 32.2 goala ke soil b) E horizon: 16% clay [50% Vermiculite, 50% Smectite], 0.5% OM: 16 kg 50 vermiculite = .08 and .16 kg * .50 smectite = .08 kg .08 kg * 140 gmalc/kg = 11.2 cmplc. 08 kg 175 14 cmpl 005 kg 250 = 1.25 emplc Total = 26.45 gols/kg soil c) Bt horizon: 24% clay [40% Vermiculite, 60% Smectite], 1.0% OM: 24 kg 40 vermiculite = .096 and -24 kg -60 smectite = .144 kg 4 096 kg 140 gmol/kg = 13.44 cmolc. 144 kg 175 = 25.2 emalc 0.01 kg * 250 = 2.5 goold
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