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scsc 301 exam 2 tamu smith Questions With Complete Solution1
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scsc 301 exam 2 tamu smith Questions With CompleteSolutions
Soils in dry regions such as Far West Texas and New Mexico frequently are
classified as - ANSWER Ardisols
A soil with an ochric epipedon and a cambic horizon is probably classified as a (an) -
ANSWER Inceptisol
Thick, dark, surface horizons in mineral soils having > 1% organic matter, strong
structure, and low base status are called - ANSWER Umbric epipedons
Translocation - ANSWER Is one of the four categories of microprocesses involved
in soil formation.
The organic matter content of soils tends to increase as - ANSWER Rainfall
increases
For a soil to contain a Bo horizon, the layer so designated must have - ANSWER
Lost weatherable silicate minerals
The symbol for a subsoil horizon which is recognized on the basis of differences in
color and structure only is - ANSWER Bw
The illuvial horizon of this list is - ANSWER Btn
The potential rate of evapotranspiration decreases as ? - ANSWER Relative
Humidity increases
Infiltration rate of water into very sandy soils is primarily a function of their -
ANSWER Structure
Describes the ease of movement of moisture, air and roots through the soil. -
ANSWER Permeability
In the soil loss equation, A=RKLSCP, the L stands for - ANSWER Slope length
On highly erosive soils the most important principle for control of erosion is to -
ANSWER keep soil covered with living or dead matter
Leaching losses associated with percolation of water increase as - ANSWER
frequency of percolating events decreases
As soils develop over time, the order of appearance of endopedons is - ANSWER
cambic
argillic
, oxic
Is an inherited characteristic in most soils formed in transported parent materials. -
ANSWER mineral composition
This horizon is a zone of clay illuviation in soils. - ANSWER Bt
Clay eluviation is the prominent feature of - ANSWER E horizons
Movement and accumulation of calcium carbonate is a micro-process essential to
the occurrence of all - ANSWER K horizons
The organic matter content in soils decreases as - ANSWER Temperature
increases
Leaching of ions and volatilization of CO2 represent - ANSWER Losses in the soil
forming process
This horizon has zones of clay accumulation having a high percent sodium
saturation and a columnar structure - ANSWER Natric
A soil classified as a Zalla fine sandy loam, sandy, mixed, hyperthermic, Typic
Ustifluvent is classified in the - ANSWER Fluvent suborder
A loamy soil having a mollic epipedon, an albic horizon, and an argillic horizon with
increasing base status with depth is classified as a (an) - ANSWER Mollisol
Soils formed in ancient sediment under a warm humid climate under forest
vegetation on stable upland sites (Southeastern U.S.) would be classified as -
ANSWER Ultisols
Land use capability subclass, s, is used to indicate a - ANSWER Root zone
limitation
The most decomposed organic horizon would be - ANSWER Oa
Runoff occurs when the precipitation rate exceeds - ANSWER Infiltration rate
For the water balance equation, P = ET + SS + D, the SS term can be decreased by
- ANSWER Compacting the Ap horizon
What are the values of each letter in the Soil loss equation? - ANSWER
A=R*K*(LS)*C*P
A= water erosion loss (tons)
R= rainfall factor (intensity & frequency)
K= soil erodibility constant (texture, structure, organic matter)
LS= length and gradient of slope
C=Crop management factor
P=Erosion control practices
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