NEW
Font size
WorksheetsSoils Quiz #3 Reviw
Total questions: 28
Worksheet time: 28mins
A conventional septic tank absorption field has the laterals placed at a depth of (BLANK) feet below the ground surface:
5-6ft
3-4ft
24-30in
No less than 12in
Practices to improve soil health for plant growth may include...
encouraging more root growth
decreasing tillage/disturbance
implementing practices to limit soil erosion
all of the above
Soils suited for a source of topsoil generally have:
more than 40in of total soil profile depth
textures in the medium textural group
have dark or black A horizons greater than 14in thick
all of the above
Indicators of a healthy soil include...
earthworms
rills
aggregates that disintegrate quickly in water
all of the above
Land used for watershed protection purposes is most likely identified as which of the following land capability classes?
II
IV
VI
VIII
This practice to overcome soil limitations should be used if there is a need to prevent rills and gullying in places where water flows quickly enough to erode unprotected soil drainageways:
surface drainage
subsurface drainage
grass waterways
contouring
This practice to overcome soil limitations should be used on areas where sod based rotations can be used on slopes ranging from 2-14%
cover crop
strip cropping
grass waterways
contouring
Adequate treatment of effluent in a septic tank absorption field is difficult to achieve if:
the soil is shallow to bedrock
the soil has a seasonally high water table
the soil is slowly permeable
all of the above
Regarding land capability subclasses, the order of preference to identify if two or more limitations exist is as follows:
erosion, wetness, soil
wetness, erosion, soil
soil, erosion, wetness
wetness, soil, erosion
T or F?: Regarding a cover crop, select "yes" on the scorecard if the judging area will be in an annual crop the following year.
True
False
Planting crop rows across the slope (rather than up and down) to reduce the velocity of runoff:
is recommended for 2-14% slopes
works well as a single practice where slopes are irregular
may reduce erosion by up to 50%
none of the above
When identifying the soil productivity potential, the following basic physical properties should be considered in this classification:
slope and texture
distribution of texture in the profile
top soil thickness and soil depth
all of the above
Land capability subclasses are used to denote the type of hazard or limitation restricting the use of soils grouped in land classes:
Classes I-IV since these are row cropped
Classes I-VIII since all soil is important to preserve
Classes V-VIII since these soils are at the greatest risk
Classes II-VIII since class I is suitable for any use
Conservation tillage:
is most effective when used with other conservation practices including contouring, grassed waterways, etc.
is not sufficient on cropland where excess sheet and rill erosion are a problem
is any tillage and planting system that leaves any amount of soil surface covered by crop residue
is the standard or common tillage practice
all of the above are true
An appropriate area for a grassed waterway would be
an upland of over 5% slope
and intermittent drainageway
a bottomland that floods frequently
a terrace area
Alternating an erosion reducing crop with a row crop across the slope would be considered:
strip cropping
double cropping
a filter crop
a cover crop
In judging soil, the soil will be rated for its productivity potential in terms of how intensively the land can be:
row cropped
profiled
tract
strip-cropping
Land capability class IV land:
is better suited for a perennial crop
could result from severe past erosion
could be 14-18% slope
all of the above
A soil with the following hazards and limitations would be considered in what subclass: severe erosion and moderately unfavorable acidity
e
w
s
e and s
e and c
Which set of management techniques would you recommend on the hillslope to decrease sediment movement and erosion across a landscape?
surface drainage, grass waterways, and terraces
subsurface drainage, contouring, and conservation tillage
grass waterways, terraces, and conservation tillage
surface drainage, contouring and terraces
subsurface drainage, strip cropping and conservation tillage
Soils whose volume changes by more than (BLANK)% will affect the stability of basement walls, the foundation, patio, sidewalks, and concrete floors anchored to the ground.
1
9
27
59
87
In evaluating sites for conventional septic tank absorption fields, bedrock is a limitation when bedrock is found:
within the first 36" of the profile
bedrock is not a problem
within the first 60" of the profile
bedrock is always a problem
within the first 72" of the profile
The shrink-swell of a soil relates to:
the external drainage of the soil
the expansion of the soil when it dries
the percent volume of change during wetting and drying
the contraction of the soil when it dries
both B and C
Land with a deep, somewhat poorly drained, medium textured soil with a 0-2% slope would be classified as:
Class I
Class Iw
Class IIw
Class IIe
None of the above
According to the soil judging manual, there are eight different land classes used to classify land. Of these eight classes, how many classes cannot have row crops grown regularly on them based on the steepness of the hill and subsequent erosion potential?
1
2
3
4
5
Land that is classified "medium" based on its potential for intensive row cropping can be row cropped:
at no time
less than 50% of the time
50% or more of the time
continuously
Which of the following land capability subclasses is not found in Iowa?
e
w
s
c
Soil that is suitable as a source for topsoil should have what type of texture?
fine
medium
coarse
both a and b
