soils physical properties. composition of average soil
Post on 22-Dec-2015
236 views
TRANSCRIPT
Soils
Physical Properties
Composition of Average SoilOrganic5%
Water25%
Mineral45%
Air25%
Air Water Mineral Organic
Factors Affecting Soil Formation
Climate
Living Organisms (plants and animals)
Parent Soil Material
Topography
Time
How To Determine Soil Texture If soil crumbles
easily, feels markedly gritty with a lack of smoothness
The soil is coarse textured and may be
Sandy loam or loamy sand
which depends on the sand content.
How To Determine Soil Texture
If no ribbon forms, and the soil feels smooth with slight or no grittiness,
The soil is medium textured and may be
Loam, Silt Loam, or Silt.
How To Determine Soil Texture
If you can form a ribbon from a ball of moistened soil,
the soil is fine textured and may be
Clay, Silty Clay, or Sandy Clay.
Determining soil TexturePick up soil sampleRub between thumb
and fingers feel whether it is
Sandy coarse-gritty feel
Loamy medium-silty, floury
Clay fine-sticky when wet
The Relative Sizes of Sand, Silt, and Clay Particles
Sizes of Particles
Name Size,Diameter in Millimeters
Very coarse sand 2-1Coarse sand 1.00-0.50
Medium Sand 0.50-0.25Fine sand 0.25-0.10
Very Fine Sand 0.10-0.05Silt 0.05-0.002
Clay Less than 0.002