TOFG-all

Soils & Soil Physical Properties

Unit 2.1 | Part 2 –13
Lecture 2: Soil Properties

t FIGURE 2.3 | SOIL STRUCTURE AND ITS EFFECTS ON PERMEABILITY

u TABLE 2.6 | SIZE CLASSES OF SOIL STRUCTURAL UNITS. THIN AND THICK, RATHER THAN FINE AND COARSE, ARE USED

FOR PLATY STRUCTURES.

SIZE CLASS PLATY COLUMNAR/ BLOCKY GRANULAR

PRISMATIC

very fine (thin) <1 mm <10 mm <5 mm <1 mm

fine (thin) 1 – 2 mm 10 – 20 mm 5 –10 mm 1 – 2 mm

medium 2 – 5 mm 20 – 50 mm 10 – 20 mm 2 – 5 mm

coarse (thick) 5 –10 mm 50 –100 mm 20 –50 mm 5 –10 mm

very coarse (thick) >10 mm >100 mm >50 mm >10 mm

Illustration by José Miguel Mayo