Soil Exam 2

Question 1

True or False: Soils formed under coniferous forest will be more acidic in the A horizon compared to those formed under deciduous forest

Answer 1

True

Question 2

Leaching is an example of:

Answer 2

Losses

Question 3

Different soils formed from the same parent material but at different topography are known as

Answer 3

Catena

Question 4

What are the factors of Horizon formation

Answer 4

Addition, Losses, Tranformation Translocation

Question 5

What are the factors of soil formation

Answer 5

Climate, Biotic factors. Time, Parent materials, and topography

Question 6

Young soils will be mostly probably clasified as

Answer 6

Entisols

Question 7

Old soils will be most probably classified as

Answer 7

Ultisoils

Question 8

Materials that has been eroded downhill not in a channel and accumulated at the base of a slope is classified as the following kind of transported material

Answer 8

Colluial

Question 9

Parent material transported by water

Answer 9

Alluvial

Question 10

Loess is a glacial deposit that has been moved into place by

Answer 10

Wind

Question 11

A moraine is associated with

Answer 11

Glaciers

Question 12

The two climatic variables have the greatest influence on soil formation are

Answer 12

Precipitation and Temperature

Question 13

The geological agent responsible for deposition alluvial parent materials is

Answer 13

Flowing water

Question 14

It is important for all land managers to know something about rocks and minerals because

Answer 14

In the field, some soil properties such as texture, clay type, and pH are influenced by the parent rock

Question 15

Elluviation is an example of

Answer 15

Translocation

Question 16

Humification is an example of

Answer 16

Transformation

Question 17

Under which of the following environmental situations would you expect to find in the most total organic matter in a soil profile? (Soil are of equal age and uncultivated

Answer 17

Gently rolling slope of a grassland in eastern Iowa

Question 18

In making a particle size analysis, the 40-second reading was 20g and the two-hour reading was 15g. If a 50g sample was used, the silt content is

Answer 18

10%

Question 19

In semiarid soils which of the following statements would adequately describe the general soil structure patterns occurring in a soil profile?

Answer 19

granular aggregation in the surface horizon with a prismatic or columnar type of structure in the subsoil

Question 20

What are the most significant in terms of aggregate cementation

Answer 20

Microbial gums

Question 21

True or False: Soil texture is a dynamic property that is rather easy to change, whereas soil structure is a static soil property that changes very little.

Answer 21

False

Question 22

True or False: The class of structure refers to the shape of the peds.

Answer 22

False

Question 23

A clay particle may have an equivalent diameter of

Answer 23

0.001 mm

Question 24

Which type of structure will typically be found in surface (A Horizon) soils in Alabama?

Answer 24

granular

Question 25

If a soil as 22% sand, 5% organic matter and 60% silt, the clay content of this soil would be given as:

Answer 25

18%

Question 26

A group of mineral soil particles with a definite upper and lower size limit defines

Answer 26

a soil separate

Question 27

Which has the greatest specific surface

Answer 27

clay

Question 28

How many possible textural class names are there?

Answer 28

12

Question 29

When one knows that a given soil horizon has a loam texture, one knows for sure that the horizon

Answer 29

contains less than 50% clay

Question 30

The hydrometer used in the particle size analysis (mechanical analysis) directly measures the

Answer 30

grams of silt and clay

Question 31

Soil structure refers to the

Answer 31

arrangement of primary soil particles to form aggregates

Question 32

A soil separate is defined by

Answer 32

its size

Question 33

If 400cm3 of a soil weighs 500g, the bulk density is

Answer 33

1.25 Mg/m3

Question 34

A soil has a bulk density of 1.69 gm/cm3 and a particle density of 2.6 gm/cm3. Its oven-dry weight is 8- gm. The porosity of the soil is what percent by volume

Answer 34

35

Question 35

Which of the following terms refers to the physical condition of the soil in its reaction to plant growth?

Answer 35

Tilth

Question 36

Commonly soil tillage is for the purpose of

Answer 36

Controlling weeds, managing crop reside, and altering the soil’s physical qualities

Question 37

The ability of soil to resist crushing is known as

Answer 37

Consistence

Question 38

Minimum tillage is a type of tillage which

Answer 38

considerably reduces the number of soil manipulation operations

Question 39

The bulk density of a soil generally does what with depth

Answer 39

Increases

Question 40

Which of the following terms refers to the physical condition of the soil in its reaction to plant growth

Answer 40

Tilth

Question 41

On average, the bulk density of soils

Answer 41

varies inversely with porosity

Question 42

A soil is said to have a Munsell color of 7.5 YR 2/6. The 2 represents the

Answer 42

value

Question 43

Soil colors of grey and blue indicates

Answer 43

poor internal drainage

Question 44

Subsoil color is predominantly the results of

Answer 44

the form of iron present

Question 45

The dominant wavelength of light reflected determines he color

Answer 45

hue

Question 46

Surface soils are usually what compared to subsoils

Answer 46

darker in color than

Question 47

True or False; As one moves toward the equator soils develop more reddish hues

Answer 47

True