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The Last Real class

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by

Brent Olson

on 27 June 2010

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Transcript of The Last Real class

The Last Real Class in which we discuss:
soil development
the hydrological cycle and water budgets
the final exam April 22, 2010
AKA Earth Day But First: Soils! not dirt Several different ways to define soil
1) Geologic definition: Loose surface of the earth as distinguished from solid bedrock (support of plant life not required).

2) Traditional definition: Material which nourishes and supports growing plants (includes rocks, water, organic material, air).
Made of: Mineral Matter
Organic Matter
Water
Air depends upon
Soil Texture
Soil Structure
Soil Chemistry
Soil Age
Site Factors (topography, water, etc)
Etc.
All of these things change over time Which is why SOIL isn't dirt...
so don't treat it that way. (remember, it's earth day) Soil Formation 5 Factors CORPT Climate:
Most important factor in soil formation:
Mostly because it is a key factor in determining the other 4 factors. PEDOGENESIS Organisms
provide the organic matter necessary for soil production and help to break it down.
affects Ph Relief
does water have time to infiltrate?
what plants can grow there?
erostion? Parent Material
weathering of rocks
composition
texture Time
All other factors require time to operate
the more time, different kinds of soil Processes of soil formation Transformations – modification of soil constituents. Mineral weathering, organic matter breakdown.
Translocations – movement up, down, or laterally of soil constituents.
Additions – movement of soil material in from outside sources. Organic material from leaves, dust from atmosphere.
Losses – movement of soil material out of the soil. Transportation to groundwater, erosion of surface materials.
Soil Horizons How we describe soils 1st, dig a big hole in the ground Available water capacity is a measure of the water available to plants.
Commonly defined as the difference between the amount of water at field moisture capacity and the amount at the wilting point.
This is the water a plant has a chance of utilizing.
Soil and water Vegetation and Water Budgets Available water capacity is a measure of the water available to plants.
Commonly defined as the difference between the amount of water at field moisture capacity and the amount at the wilting point.
This is the water a plant has a chance of utilizing.
EXAm Review
Full transcript