SWS3022 Soil Taxonomy Exam Questions and Answers 100% Pass

SWS3022 Soil Taxonomy Exam
Questions and Answers 100% Pass


What are the Soil Master Horizons? - ✔✔O


A


E


B


C


R


The O MASTER HORIZON - ✔✔Greater than 20% OM




Organic horizon formed above the mineral soil.




Derived from decomposition of plant and animal residues




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,Range in thickness from absent to meters thick.


The A MASTER HORIZON - ✔✔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 - ✔✔Zone of ELUVIATION




E = eluviation = exit


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, Maximum losses by translocation


1. OM


2. Clays


3. Carbonates


4. Fe/Al oxides


5. Light-colored


6. Contains quartz (resistant primary minerals)


The B MASTER HORIZON - ✔✔Accumulates material lost from above, or forms in

place. (translocation, transformation)




Zone of ILLIVIATION = additions




The subordinate horizon indicates WHAT is accumulating




1. OM


2. Clays



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