SWS3022 Soil Taxonomy Exam Questions with Correct Answers
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Module
SWS3022 Soil Taxonomy
Institution
SWS3022 Soil Taxonomy
SWS3022 Soil Taxonomy Exam Questions with Correct Answers
T or F: A soil has a high CEC and a low Base Saturation. It is difficult to raise the pH. - Answer-T
High CEC = Numerous Negative Sites
Low %B.S. = Most Sites occupied by ACIDS
High amounts of acid on exchange complex must be rep...
SWS3022 Soil Taxonomy Exam
Questions with Correct Answers
T or F: A soil has a high CEC and a low Base Saturation. It is difficult to raise the pH. -
Answer-T
High CEC = Numerous Negative Sites
Low %B.S. = Most Sites occupied by ACIDS
High amounts of acid on exchange complex must be replaced/neutralized
T or F: The suffix -ent indicates an entisol. - Answer-T
T or F: The subordinate horizon designation, t, indicates a subsurface accumulation of
OM. - Answer-F
indicates silicate clays
T or F: Exchangeable acidity can be measured with a pH meter. - Answer-F
T or F: Soil solution electrical conductivity is one measure of soil salinity. - Answer-T
Two Soils have a Base Saturation of 50%.
Soil A: CEC = 40 cmolc/kg
Soil B: CEC = 10 cmolc/kg
How much more acid does soil A have than soil B? - Answer-4 times more acid in the
exchangeable pool.
Soil A: Acids and Bases 20 cmolc/kg
Soil B: Acids and Bases
5 cmolc/kg
20/4 = 5
T or F: Low rainfall = minimal leaching in dry environments and minimizes acidity . -
Answer-T
, Less weathering of primary/secondary minerals (less Al3+ and hydrolysis)
T or F: Absence of Carbonates contributes to low Alkalinity. - Answer-F
Presence of CO32- and HCO3- act as bases and increase Alkalinity
Sodium Carbonates have greater water Solubility and Higher pH Soils
T or F: Less weathering = more 2:1 type clays with high CEC. - Answer-T
Kaolinite (1:1) aluminosilicate 2-5 cmolc/kg
Smectite (2:1) aluminosilicate 80-120 cmolc/kg
What are the Soil Master Horizons? - Answer-O
A
E
B
C
R
The O MASTER HORIZON - Answer-Greater than 20% OM
Organic horizon formed above the mineral soil.
Derived from decomposition of plant and animal residues
Range in thickness from absent to meters thick.
The A MASTER HORIZON - Answer-Topmost MINERAL horizon (topsoil)
Subject to significant weathering
Zone of gas and water exchange
High in plant roots, biotic activity
Cycling of carbon and nutrients
Accumulates OM
Typically darker than soil below
The E MASTER HORIZON - Answer-Zone of ELUVIATION
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