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2012 soil
 

2012 soil

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  • Parent Rock Bedrock Residual Soil Transported Soil
  • Leaching

2012 soil 2012 soil Presentation Transcript

  • h. Describe soil asconsisting of weatheredrocks and decomposed organic material.
  • Essential Question
  •  What are the scientists  Pedologist called that study soil? Soil Formation  Soil is formed slowly as rock (parent material ) erodes into tiny pieces near the Earth’s surface . Bedrock is the layer of rock just beneath soil.  Soil is made up of distinct Soil Layers horizontal layers called horizons . Range: organic upper layers to underlying rocky layers.
  • What is loam? Soil composed of sand, silt, and clay in relatively even concentration
  • Soil Properties: Soil Texture Definition: the soil quality that is based on the proportions of soil particles. Affects the soil’s consistency – The soil’s ability to be worked and broken up for farming Influences infiltration – Ability of water to move through the soil – Also known as percolation
  • Soil Properties: Soil Structure Definition: the arrangement of soil particles Often one type of soil particles will clump in one area, which can block the flow of water through the soil affecting soil moisture.
  • Soil Leaching Soil leaching refers is the movement of nutrient elements from topsoil through the soil profile. Leaching causes significant nutrient losses , particularly in humid regions with high precipitation. Leaching is a natural process caused mainly by precipitation , acidification and nitrogen saturation.
  • Soil Properties: Soil Fertility Definition: soil’s ability to hold nutrients and to supply nutrients to a plant Soils vary in the amount of nutrients it contains. Plants need nutrients (such as IRON ) to grow.
  • Soil pH Soils can be acidic or basic pH scale – Used to measure how acidic or basic a soil is and ranges from 0 to 14 . – The midpoint 7 is neutral. Above 7= basic . Below 7= acidic . The pH of a soil influences how nutrients dissolve in the soil.
  • Soil Horizons
  • Summarize the