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CASE 4.2.1 Getting the Feel for Soil

CASE 4.2.1 Getting the Feel for Soil. Wednesday, 9/26/12: Getting the Feel for Soil. Objectives: Sand, silt, and clay are three sizes of mineral particles that comprise soil texture. Soil structure and soil texture are elements that affect soil function. Bellwork :

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CASE 4.2.1 Getting the Feel for Soil

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  1. CASE 4.2.1Getting the Feel for Soil

  2. Wednesday, 9/26/12:Getting the Feel for Soil • Objectives: • Sand, silt, and clay are three sizes of mineral particles that comprise soil texture. • Soil structure and soil texture are elements that affect soil function. • Bellwork: • What are the 3 mineral particles that make up soil? • How can soil type effect ag production?

  3. Soil Textures • Refers to the sizes of individual soil particles, OR the fineness or coarseness of soil. • 3 Soil Particles: • Sand • Silt • Clay

  4. Sand • The larger particles in soil • Can be seen with the naked eye • Infertile and lacking nutrients to grow plants • Dries out quickly

  5. Silt • Between sand and clay in particle size • Provides few nutrients for growing plants • Erodes easily • Forms a surface crust after rainfall

  6. Clay • Smallest of the soil particles • Microscopic in size • Holds soil nutrients • Holds more moisture than sand or silt • Expands and contracts depending on moisture • Dries out slowly • Becomes cloddy if not managed

  7. Soil Triangle

  8. 30% Clay 60% Silt 10% Sand Silty Clay Loam

  9. 20% Clay 40% Silt 40% Sand Loam

  10. 40% Clay 30% Silt 30% Sand • 70% Clay 10% Silt 20% Sand • 10% Clay 10% Silt 80% Sand

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