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Crops 103 > Chapter 12 > Flashcards

Chapter 12 Flashcards

1
Q

Agricultural operations can cause modifications to the C horizon.

A

False

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2
Q

Soils in wet tropical regions tend to have high organic matter and distinct profiles.

A

False

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3
Q

Weathered rock can be a source of essential minerals for plants.

A

True

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4
Q

Plants with low C:N ratios decay rapidly.

A

True

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5
Q

Sawdust added to soil can cause nitrogen deficiency.

A

True

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6
Q

Organic matter has a positive charge.

A

False

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7
Q

Higher earthworm populations are achieved in conventional tillage in comparison to no-till.

A

False

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8
Q

Plants infected with mycorrhizal fungi can absorb phosphorus better than noninfected plants.

A

True

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9
Q

Productive soils are densely packed.

A

False

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10
Q

A plant will extract water at field capacity until it reaches the permanent wilting point.

A

True

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11
Q

Sandy soils drain at a faster rate than clay soils.

A

True

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12
Q

Soils that are fertile and hold nutrients will have a low cation exchange capacity.

A

False

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13
Q

The pH of a soil is important because it influences the availability of plant nutrients.

A

True

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14
Q

Most crops grow well in soils with high salinity.

A

False

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15
Q

Crop yields will increase indefinitely in response to increasing fertilizer.

A

False

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16
Q

Synthetic fertilizers are used to provide organic matter to the soil.

A

False

17
Q

Geologic erosion occurs at a faster rate than soil formation.

A

False

18
Q

Erosion can leave behind less fertile subsoils.

A

True

19
Q 
How thick does the soil layer tend to be in agricultural regions?
A. 3 to 4 inches
B. 4 to 12 inches
C. 3 to 4 feet
D. 4 to 12 feet
A

C. 3 to 4 feet

20
Q 
A vertical section through the soil extending from the surface to the unweathered rock is best described as the:
A. crust
B. horizon
C. profile
D. core
A

C. profile

21
Q 
The topsoil is also known as the
A. A horizon
B. B horizon
C. C horizon
D. O horizon
A

A. A horizon

22
Q 
The subsoil is also known as the 
A. A horizon
B. B horizon
C. C horizon
D. O horizon
A

B. B horizon

23
Q 
Which horizon has the highest amount of organic matter?
A. A horizon
B. B horizon
C. C horizon
D. O horizon
A

O horizon

24
Q 
Which of the following is one of the most important soils in agricultural production?
A. aridisol
B. mollisol
C. gelisol
D. spodosol
A

B. mollisol

25
Q 
Which is the predominant parent material for soils?
A. igneous rock
B. sedimentary rock
C. metamorphic rock
D. slate rock
A

B. sedimentary rock

26
Q 
The fineness or coarseness of a soil is called:
A. soil field capacity
B. soil structure
C. soil aggregation
D. soil texture
A

D. soil texture

27
Q 
Sand and silt are chemically composed mostly of:
A. silica
B. potassium
C. soil aggregation
D. soil texture
A

A. silica

28
Q 
Which soil particle contributes most to plant nutrition?
A. sand
B. silt
C. clay
D. silica
A

C. clay

29
Q 
The clustering of soil particles into various shapes is called:
A. soil field capacity 
B. soil structure
C. soil salinity
D. soil texture
A

B. soil structure

30
Q 
The pH range that most field crops grow best at is: 
A. 4-5
B. 5-6
C. 6-7
D. 7-8
A

C. 6-7

31
Q 
Which of the following is an index that rates soils for intensive agricultural production on a 0 to 100-value scale?
A. Crop Agricultural Index
B. Crop Productivity Index
C. Crop Parameter Index
D. Crop Suitability Index
A

B. Crop Productivity Index

32
Q 
One distinction between organic and inorganic fertilizers is that organic fertilizers contain:
A. carbon
B. nitrogen
C. potassium
D. lime
A

A. carbon

33
Q 
Which of the following fertilizer nutrients is NOT obtained from mining?
A. phosphorus
B. nitrogen
C. potassium
D. calcium
A

B. nitrogen

34
Q 
Limestone is applied to soil to:
A. increase organic matter
B. add potassium
C. add phosphorus
D. increase soil pH
A

D. increase soil pH

Crops 103 (21 decks)

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