Flashcards in Test 1 Deck (112)
Any foul substance such as mud and grime, dust ,excrement
unconsolidated mineral and organic materials on the immediate surface of the earth that serve as a natural medium for the growth of plants.
the study of soil a natural body.
study of soil from the standpoint of higher plants.
funcitons of soils(6)
1. medium for plant growth
2.recycling system for nutrients and organic matter.
3.Habitat for soil organisms.
4. Water supply and purification.
5. Engineering Medium.
6. Modifier of the Atmosphere.
top 1 to 2 meters where plant growth occurs.
Unconsolidated material overlying rock
arrangement of the soil particles.
Red soil Indicates
dehydrated iron compounds
Yellow Soil indicates
hydrated iron oxides, somewhat restricted drainage.
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)
dominant color of the rainbow
degree of lightness or darkness
degree of purity of hue.(departure from grayness)
Soil Texture influences(4)
water intake, absorption, soil aeration, and the nutrient holding capacity.
Sand particle size
Silt particle size
Clay particle size
less than .002mm
Anything under 2mm in size
the arrangement of soil sparates into aggregates called peds.
(type of structure)Soil surface affected by tillate
(type of structure) very porous granular
(type of structure) anything flat
(type of structure) angular or subangular
(type of structure) single grained
A vertical section of the soil through all of its horizons, extending surface to the parent material.