Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

AGR 345 Soil Science > Chapter 4 Quiz > Flashcards

Chapter 4 Quiz Flashcards

(59 cards)

Start Studying
1
Q

8 soil physical properties

A
  1. soil color
  2. soil texture
  3. soil structure
  4. soil densities
  5. total porosity
  6. soil compaction
  7. soil tilth
  8. aggregate stability
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

easiest soil properties to change

A

color, structure, bulk density, soil porosity, compaction, aggregate stability

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

what are the two soil densities

A

bulk density and particle density

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

bulk density >1.5 g/cm3 =

A

compacted

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

organic soil has a bulk density < _____ g/cm3

A

1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

mineral soil has a bulk density > ______ g/cm3

A

1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

particle density =

A

2.65 g/cm3

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

the water and air in the soil equals…

A

total porosity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

water has _____ pores

A

small

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

air has _____ pores

A

large

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

total porosity functions

A

air movement/circulation and water movement/circulation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

total porosity size

A

macropores, micropores, and mosopores

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

soil tilth

A

how easy it is to till

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

aggregate stability

A

relates to soil erosion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

organic matter is the ____ of aggregates

A

glue

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

4 soil color determinants

A
  1. mineralogy
  2. organic matter
  3. hydrology
  4. soil chemistry
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

determining soil color

A

Munsell Color Chart, hue, chroma, and value

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

soil colors common in Calloway County

A

7.5YR and 10YR

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

10 YR 6/3
10YR =
6=
3=

A

10YR = hue
6= value
3= chroma

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

y axis =

A

value

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

x axis =

A

chroma

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

top right corner

A

hue

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

A horizon

A

mid/low value and low chroma

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

E horizon

Study These Flashcards
A

high value and low chroma

25
B horizon
we don't know
26
water table depth can impact...
soil color
27
soil texture
proportion of sand, silt, or clay in the soil
28
soil separate
three categories based on particle size
29
largest particle size = smallest particle size =
l = sand s = clay
30
soil texture importance
related to porosity and surface area
31
__ texture classes
12
32
texture-by-feel
field texture id method
33
hydrometer
lab texture id method
34
sedimentation
texture id method
35
soil must have a particle diameter...
< 2mm
36
sand diameter
2.0 - 0.05mm
37
sand dominant material
quartz
38
silt diameter
0.05-0.002mm
39
silt dominant materials
quartz / feldspar / mica
40
clay diameter
<0.002mm
41
clay dominant materials
secondary minerals
42
soil texture importance (4)
1. provides water flow potential 2. influences water holding capacity 3. indicates fertility potential 4. indicates suitability for urban purposes, such as buildings
43
sand characteristics (4)
1. low specific surface area 2. gritty 3. resists compaction and increases porosity 4. rapid infiltration and drainage
44
specific surface area means...
how well soil can absorb water and nutrients
45
silt characteristics (4)
1. high specific surface area 2. silky and smooth 3. promotes water retention and air circulation 4. moderate infiltration
46
clay characteristics (6)
1. large surface area 2. small pores 3. high water holding capacity 4. increased water retention 5. slow infiltration and poor drainage 6. sticky and easily compacted
47
small clay particles are...
colloids
48
USDA textural classes
sandy soils (coarse), loamy soils (medium), clayey soils (fine)
49
soil porosity
the total volume of soil pores and the distribution of pore sizes
50
ideal soil porosity is...
50%
51
soil compaction = soil porosity...
>50%
52
sand has ____ # or % of pores but _______ size
less; bigger
53
clay has ____ # or % of pores but _______ size
more; smaller
54
Western KY has
silt loam
55
____: large particles = large pore spaces
sand
56
____: small particles = small pore spaces
clay
57
more specific surface area is better because...
it can absorb more nutrients
58
specific surface area formula
surface area / mass (label cm2/g)
59
clay is _________ in the texture triangle
horizontal

AGR 345 Soil Science (3 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions