<) 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)
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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Question
![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](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F6670fa30-91bc-4a72-b375-2fd1d158ed3e%2Fdc16cfb6-4e54-4c09-abca-bf05aea8c775%2Fh5zjket_processed.jpeg&w=3840&q=75)
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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