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Into To Soil Science > Week 4 And 5- Soil Grade And Other Info > Flashcards

Week 4 And 5- Soil Grade And Other Info Flashcards

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1
Q

What is Grade?

A

determined by handling soil or gently erushing soil
-note durability of aggregates

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2
Q

What is SingleGrain soil?

A

Structureless soil that is broken into individual particles that do not stick together

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3
Q

What is massive soil?

A

Structureless soil that is hard to break apart and appears in large clods. Commonly found in C horizon

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4
Q

Dry consistent soft (s)

A

Very weakly coherent and fragile

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5
Q

Dry consistent slightly hard (sh)

A

-weakly resistant to pressure moderately hard, moderately resistant to pressure

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6
Q

Dry consistent moderately hard (mh)

A

Moderately resistant to pressure

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7
Q

Dry consistent hard (h)

A

Resistant to pressure

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8
Q

Dry consistent very hard (vh)

A

Very resistant to pressure

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9
Q

Dry consistent extremely hard (eh)

A

Extremely resistant to pressure, cannot be broken with thumb and forefinger

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10
Q

Moist consistency loose(l)

A

Noncoherent

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11
Q

Moist consistency friable (fr)

A

Crushes easily with gentle to moderate pressure

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12
Q

Moist consistency very friable (vf)

A

soil material croshes very gently pressure but coheres when pressed together

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13
Q

Moist consistency firm(fi)

A

Crushes under moderate pressure but resistance is noticeable

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14
Q

Moist consistency very firm (vf)

A

Crushes under strong pressure

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15
Q

Moist consistency extremely firm

A

Crushes only under very strong pressure

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16
Q

Wet consistency plasticity

A

ability to change shape continuosly under the influence of an applied stress and to retain the impressed shape on removal of the stress

17
Q

Factors controlling soil aggregation

A

-Flocculation, soil environment, climate, and management

18
Q

What is flocculation?

A

An elemental process that causes small particles to clump together in large clusters. Clays and organic matter have negatively charged surfaces
Ca, Mg, Al

Into To Soil Science (3 decks)

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