soil
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Soil. Let’s dig in!. Soil Exam. General Study Questions form the Soil Survey Soil Pit - PowerPoint PPT PresentationTRANSCRIPT
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Soil
Let’s dig in!
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General Study Questions form the Soil Survey Soil Pit
Soil is a living naturally occurring dynamic system at the interface of air and rock. Soil forms in response to forces of climate and organisms that act on the parent material in a specific landscape (topography) over a period of time
Soil Exam
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Food Fiber Fuel Buildings Recyles and detoxifies waste
Soil = 6 feet deep 1 rsp of soil = 50 billion living things
Importance of Soil
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Soil Profile
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What is soil composed
of?
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Soil is composed of three main
elements: Sand Clay Silt
The amount or percentage of each element determines the soil's texture
Soil texture
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Determine the
texture
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Sand = feels gritty Silt = feels floury Clay = sticky when wet
Loams = mixture of materialshttp://www.envirothonpa.org/pdfs/10%20-%20Soil%20Reference.pdf
Textures
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Factors forming soil
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Soil Structure
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Topsoil – dark organic matter Subsoil = less organic matter Red soil = often high iron, well drained Wet soil = lack of O leads to grey colors
Soil Color
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Soil pH range of 6 to 7 is most favorable
for plant growth Great diversity of pH in PA (more acidic
than alkaline) Low pH = add lime High pH = add sulfur or sulfuric acid
Soil pH
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http
://soils.usda.gov/survey/online_surveys/pennsylvania/#york2003
Resources:http://www.envirothonpa.org/StationTraining2.html?tab=2#TabbedPanels1
Soil Survey