Test 1
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Any foul substance such as mud and grime, dust ,excrement
Dirt
unconsolidated mineral and organic materials on the immediate surface of the earth that serve as a natural medium for the growth of plants.
Soil
Define Pediology
the study of soil a natural body.
Define Edaphology
study of soil from the standpoint of higher plants.
funcitons of soils(6)
• medium for plant growth • recycling system for nutrients and organic matter. • Habitat for soil organisms. • Water supply and purification. • Engineering Medium. • Modifier of the Atmosphere.
top 1 to 2 meters where plant growth occurs.
Solum
Unconsolidated material overlying rock
Regolith
arrangement of the soil particles.
Soil Structure.
Red soil Indicates
dehydrated iron compounds
Yellow Soil indicates
hydrated iron oxides, somewhat restricted drainage.
Gray
reduced iron and poor drainage.
What typically produce soil colors?(4)
organic matter,iron compounds, silica and lime
Soil color indicates what (4)
organic matter, drainage, salts, and weathering
Surface soils are generally darker than subsoil due to higher concentration of organic matter contents, (True or False)
True.
dominant color of the rainbow
Hue
degree of lightness or darkness
Value
degree of purity of hue.(departure from grayness)
Chroma
Soil Texture influences(4)
water intake, absorption, soil aeration, and the nutrient holding capacity.
Sand particle size
.05-2mm
Silt particle size
.002-.05mm
Clay particle size
less than .002mm
Anything under 2mm in size
Soil particle
the arrangement of soil sparates into aggregates called peds.
Structure
(type of structure)Soil surface affected by tillate
Granular