Lecture 6 Measuring Texture

Lecture 6 Measuring Texture - Determination of Soil Texture...

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1 Determination of Soil Texture Determination of Soil Texture Soil Texture Soil Texture Diameter Sand (2.0 – 0.05 mm) Quartz Silt (0.05 – 0.002 mm) Quartz /Feldspars/mica Clay (<0.002 mm) Secondary minerals Dominant Minerals Class Importance of Soil Texture Soil Porosity Particle Surface Area (Distribution of particle sizes)
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2 Texture and Pore Sizes Large particles yield large pore spaces Small particles yield small pore spaces Water moves rapidly and is poorly retained in Coarse-textured sandy soils. Water moves slowly and is strongly retained in Fine-textured, clayey soils. Surface Area Surface Area Specific Surface Area = Surface Area mass cm 2 g units Interface with the environment nutrients gasses O.M. water microorganisms 60% sand, 10% silt, 30% clay 60% sand, 10% silt, 30% clay
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3 Sand <10% Loamy sand 10 – 15% Sandy loam 15 – 20% Sandy clay loam 20 – 35% Sandy clay 35 – 55% Clay > 50% Florida Soils clay Texture by Feel Sand = Gritty Silt = Smooth Clay = Sticky, Plastic Soil Horizons Textural Class Clay Content Surface Area Potential Reactivity
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Lecture 6 Measuring Texture - Determination of Soil Texture...

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