APES Test #2- Soil
Soil power point
Terms in this set (23)
Soil forming factors
CLORPT: Climate, Organisms,Topography, Parent Material, and Time
46% Mineral Matter, 26% Soil Air, 26% Soil Water, 6% Organic material
Soil Physical Characteristics
Soil Textture, consistency, & structure. Soil compaction (Bulk Density), Soil Moisture
Soil Chemical Characteristics
Chemical Bonding, pH, Cation Exchange Capacity, Nutrient Availability
Consistency & Structure
How the mineral components are put together
largest particles, feel "gritty"
medium sized, feel soft, silky or "floury"
smallest sized particles, feel sticky. largest surface area per particle. negative charges
mixture of sand, silt, and clay. sandy clay loam is best in landscapes, best for agriculture
Effects of Soil Texture
more cohesive when they have more fine particles (clay)
Effects of Soil Texture
more loose when they have more coarse particles (sand)
measure of soil compaction
Pore Spaces and Soil Particles
Location of air and water.
Mineral and organic
percentage of void spaces between grains in soil. effects how much water soil can hold and how fast water can flow through layer.
measure of the ability of a porous material to allow fluids to pass through it
Macro nutrients- needed in large amounts
Nitrogen, Phosphorus, Potassium, Calcium, Magnesium, Sulfur
Micro nutrients- needed in small amounts
Chlorine, Cobalt, Copper, Iron, Manganese,
Molybdenum, Nickel, Zinc
refers to the ability of an object to attract and hold particles on its surface
Anion meets cation
combine to become a molecule
Cation Exchange Capacity (CEC)
total amount of cations that a soil can retain. higher CEC greater ability to store plant nutrients. CEC increases as amt. of clay increases. amt. of organic matter increases. soil pH increase (more basic)
very important because soil solution carries in nutrients. Phosphorus available to plants when soil pH is btw. 6.0-7.0.
Soil able to absorb nutrients/other chemicals. most important absorbers: clay/ organic matter. Absorbed nutrients available to plants. absorbed nutrients not prone to loss in drainage water. soil absorption can be exceeded leading to greater nutrient loss.
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