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Flashcards in Test 1 Deck (112)
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1

Any foul substance such as mud and grime, dust ,excrement

Dirt

2

unconsolidated mineral and organic materials on the immediate surface of the earth that serve as a natural medium for the growth of plants.

Soil

3

Define Pediology

the study of soil a natural body.

4

Define Edaphology

study of soil from the standpoint of higher plants.

5

funcitons of soils(6)

1. medium for plant growth
2.recycling system for nutrients and organic matter.
3.Habitat for soil organisms.
4. Water supply and purification.
5. Engineering Medium.
6. Modifier of the Atmosphere.

6

top 1 to 2 meters where plant growth occurs.

Solum

7

Unconsolidated material overlying rock

Regolith

8

arrangement of the soil particles.

Soil Structure.

9

Red soil Indicates

dehydrated iron compounds

10

Yellow Soil indicates

hydrated iron oxides, somewhat restricted drainage.

11

Gray

reduced iron and poor drainage.

12

What typically produce soil colors?(4)

organic matter,iron compounds, silica and lime

13

Soil color indicates what (4)

organic matter, drainage, salts, and weathering

14

Surface soils are generally darker than subsoil due to higher concentration of organic matter contents, (True or False)

True.

15

dominant color of the rainbow

Hue

16

degree of lightness or darkness

Value

17

degree of purity of hue.(departure from grayness)

Chroma

18

Soil Texture influences(4)

water intake, absorption, soil aeration, and the nutrient holding capacity.

19

Sand particle size

.05-2mm

20

Silt particle size

.002-.05mm

21

Clay particle size

less than .002mm

22

Anything under 2mm in size

Soil particle

23

the arrangement of soil sparates into aggregates called peds.

Structure

24

(type of structure)Soil surface affected by tillate

Granular

25

(type of structure) very porous granular

crumb

26

(type of structure) anything flat

platy

27

(type of structure) angular or subangular

Blocky

28

(type of structure) single grained

structure less.

29

A vertical section of the soil through all of its horizons, extending surface to the parent material.

Profile

30

horizontal soil layer that differs in characteristics from layers above and below.

Horizon