Soils test 1

Minerals

sesquioxides

Clays

<0.002

1:1

2:1

H bonds

Soil

Texture

Fine fraction

Coarse

Silt

0.05-0.002mm

Sources of charge

isomorphous

substitution

Fixed charge

Shrink swell

Variable

Protonation

Micropores

Macro pores

Sands

Pore size

ion exhange

Cation exchange capacity

total amount of exchangeable cations held by a given mass of soil at a particular pH