AGRY 255 Study Set

Munsell System

system used to help define the colors that we see

Hue

tint

Value

lightness/darkness

Chroma

intensity/brigthness

RED,BROWN,TAN,YELLOW

OXIDIZED OR FERRIC IRON

WELL DRAINED

GREYS

NOT MUCH IRON

NOT WELL DRAINED

Organic Matter Color

Very Darkish Color

Absence of Organic Matter COLOR

Very grayish and dry

Sand Particle Size

0.05mm-2mm

Silt Particle Size

0.002-0.05mm

Clay Particle Size

Less than 0.002mm

Textural Triangle

Broken down into mainly three zones Sand/Silt/Clay

Texture

Size of the Soil Particles

Structure

manner in which the soil particles are aggregated together

PEDS

Particles aggregated together from distinct structural units

Granular

Very Porous and crumb like

Platy

Looks like plates stacked on top of each other and smushed

Subangualr

They are more circle shaped rocks

Angular

They are shaped more jagged and like cubes

Prismatic

Just like angular except they extend a lot longer

Single Grained

Particles are not aggregated

Massive

Large Cohesive Masses

O

Organic Matter

A

Mineral mixed with humus

E

Elevation of Clays