Soil Texture Triangle Worksheet x1r1v

INTRODUCTION TO SOILS SOIL TEXTURAL TRIANGLE FACILITATORS: M PAUL | KK MCKENZIE

THE SOIL TEXTURAL TRIANGLE

(RULER MUST BE PARALLEL TO THE SAND LINE)

(RULER MUST BE PARALLEL TO THE CLAY LINE)

(RULER MUST BE PARALLEL TO THE SILT LINE)

0

INTRODUCTION TO SOILS SOIL TEXTURAL TRIANGLE FACILITATORS: M PAUL | KK MCKENZIE

Practice Exercises % Sand

% Silt

% Clay

Texture Name

a)

75

10

15

_______________________

b)

10

83

7

_______________________

1. Using your soil texture chart and example, determine the following soil textural class using the percentages given. % Sand

% Silt

% Clay

Soil Texture

example

75

10

15

sandy loam

a)

90

5

5

__________________________

b)

40

45

15

__________________________

c)

15

10

75

__________________________

d)

10

46

44

__________________________

e)

55

10

45

__________________________

2. A sample of soils was screened and the size separates (smaller than 2mm) were determined, along with the following results: Sand content (2 – 0.04mm diameter)

140 grams

Silt content (0.05 – 0.002mm diameter)

38 grams

Clay content (<0.002mm diameter)

22 grams

Determine the percentage of the total weight of each soil portion, and using the Soil Texture Triangle, determine the soil textural class.

1