Soils Exam Two

Helpfulness: 0
Set Details Share
created 9 years ago by ndc33
47 views
Soil Formation Soil colloids
Grade levels:
College: Third year
show moreless
Page to share:
Embed this setcancel
COPY
code changes based on your size selection
Size:
X
Show:
1

How do we classify soils?

Land capability classes and by soils basic properties " Soil Taxonomy"

2

In soil taxonomy, which level is the broadest?

The Order

3

Which surface horizon is thick and dark colored with a chroma less then 3 and a high base saturation?

Mollic Epipedon (A)

4

Which surface horizon is thick and dark colored with a chroma value of 3 and a low base saturation?

Umbric Epipedon (A)

5

Which nutrient is an indicator of a mature profile?

Al (Aluminum)

6

Which soil horizon is light colored and has low organic content that may be hard and massive when dry? What is an example

Ochric (A) horizon - ex: Entisol

7

Which soil horizon is very high in O.M. and wet during part of the year (wetland)? The base saturation has to be ___% or higher.

Histic (O) horizon - 12% or higher

8

Which soil horizon is a man modified mollic horizon that has high available phosphorous (Europe) and higher O.M. due to irrigation. What are two locations in the world that contain this type of horizon due to long term animal production?

Anthropic (A) - The N.E. and Europe

9

Which soil horizon is man made sod-like that has lots of manure and is common in Europe?

Plaggen (O)

10

Which soils are new/recent and have little profile development. Ochric epipedon is common (ENT)

Entisols

11

Embryonic soils with few diagnostic horizons. Ochric or umbric epipedon, cambic horizon( young soil) (EPT) - Inception

Inceptisols

12

Mollic epipedon, high base saturation, argillic or natric horizon. Mature/middle ages soils that form under high vegitative conditions (OLL)-Mollify

Mollisols

13

Pedalfer-argillic or natric horizon, medium to high base saturation. Middle aged soil that do not have the influence of O.M.-forms under forest applications (ALF)

Alfisols

14

Ultimate-argillic, low base saturation. They are older soils that have leached for a longer period of time. (ULT)

Ultisols

15

Oxide-Oxic horizon, no argillic, highly weathered. In topical soils such as TX, Hawaii, and GA. Really old soils not found in MS (OX)

Oxisols

16

Invert-high in swelling clays, deep cracks when soil is dry. (ERT)

Vertisols

17

Arid-Dry soil, ochric epipedon, sometimes argillic or natric horizon. Old soils with no moister and not found in MS (RID)

Aridisols

18

Podzol (Odd)-spodic horizon commonly Al or Fe and humus accumulation. Lots of reds and browns. Water management is hard. Found in MS and FL (OD)

Spodosols

19

Histology-peat or bog 12% O.M. or higher (IST)

Histosols

20

Andesite- volcanic, dominated by allophane or Al humic complexes. Not in MS (AND)

Andisols

21

Permafrost-Gelid. Not in MS (GEL)

Gelisols

22

Which soils are not found in MS?

Gelisols, Andisols, Oxisals, Aridisols

23

Based on genetic factors (Climatic, vegetation, wetness)

Suborder

24

Based on the diagnostic horizons

Great Group

25

Intergrades with soils of other orders

Subgroup

26

Based on texture, mineralogy, temperature, and soil depth.

Family

27

Down the the pedon. generally named after a nearby town or location

Series (Most Specific)

28

Soil surveys/maps

based on pedon descriptions, define soil boundaries,compile soil information, communicate geographic information (Age, slope, ect..)

29

Whats does a soil survey description tell us?

Suitability for land use, chemical characteristics, physical characteristics, drainage, agricultural yield potential, non-agricultural potential