Soils iClicker Quiz 2 Flashcards Preview

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Flashcards in Soils iClicker Quiz 2 Deck (19):
0

Soil properties

Color, texture, structure, density, porosity, compaction

1

Soil color factors

Organic matter, water, presence and oxidation state of iron and manganese

2

Chart used for soil color

Munsell color chart

3

10YR 5/6
What does this describe?

Hue
Value
Chroma

4

Soil texture

Different sized particles

5

Soil texture influences:

Bulk density, water holding capacity, cation(gas) exchange, aeration, erodability, drivability, strength

6

Sand size?

2 - .05 mm

7

Silt size?

.05 - .002 mm

8

Clay size?

.002 >

9

Is silt cohesive?

No

10

______ - many primary soil particles held in a single cluster

Aggregate

11

Physical processes of soil aggregates

Wetting drying, freezing thawing

12

Biological processes of soil aggregates

Burrowing organisms, plant root extension, root, fungal, and bacterial secretions

13

2 types of soil density?

Particle density - mass of solids/volume of solids

Bulk density - mass of solids/ volume of soil

14

Percentage if earth's freshwater in soils?

33%

15

Forces that affect potential energy of soil water:

Gravity
Matric
Osmotic

16

3 types of water movement in soil:

Saturated flow : gravity
Unsaturated flow: matric
Vapor flow

17

Field capacity:

Only water held against gravity renaming
-10 to -30 kPa

18

Per meant wilting point:

When plant roots can no longer extract water
Around - 1500 kPa