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Understanding Soil Texture and Hydraulic Infiltration: A Comprehensive Analysis

Explore the relationship between soil texture and hydraulic infiltration rates, water holding capacity, and more. Discover the classifications, properties, and impacts of different soil textures on water movement and retention. Learn about saturated hydraulic conductivity and its variations. Gain insights into how soil texture affects bulk density and porosity. This in-depth guide provides valuable information for understanding and managing soil quality and water dynamics.

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Understanding Soil Texture and Hydraulic Infiltration: A Comprehensive Analysis

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  1. Relating Texture to Hydraulics

  2. Infiltration • Rapid – water enters at > 7.5 cm (3 in) per hour • sand, loamy sand, coarse sandy loam with good structure • Moderate – water enters at 0.5 - 7.5 cm (0.2 - 3 in) per hour • Very fine and fine sandy loam, sandy loam with weak or moderate structure • silt loam, silty clay loam, sandy clay loam, loam, clay loam, or clay with moderate or strong structure • sandy clay with strong structure • Slow – water enters at < 0.5 cm (0.2 in) per hour • Silty clay loam, silty clay, sandy clay and clay with weak structure (commonly 2:1 clay)

  3. Runoff Classes

  4. Plant Available Water Holding Capacity

  5. Water Holding Capacity Classes • TOTAL for 150 cm (60 in) of soil profile • Very low - <7.5 cm (3 in) of water • Low – 7.5-15 cm (3-6 in) of water • Moderate – 15-22.5 cm (6-9 in) of water • High - >22.5 cm (9 in) of water

  6. 0 Loamy sand 30 cm X 0.05 cm/cm = 1.5 cm 30 Clay loam 100 cm X 0.15 cm/cm = 15.0 cm 130 Silt loam 20 cm X 0.2 cm/cm = 4.0 cm 150 1.5 + 15.0 + 4.0 = 20.5 cm

  7. Saturated Hydraulic Conductivity (permeabity) • Rapid (high) – Rates > 12 cm (5 in) per hour • sand, loamy sand, and some sandy loams and loams with strong structure (no redox) • Moderate – Rates 0.5 - 12 cm (0.2 - 5 in) per hour • Textures and conditions not in other classes (few redox features) • Slow – Rates < 0.5 cm (0.2 in) per hour • Clayey textures (clay, sandy clay, silty clay) with weak structure or massive, often 2:1 clay, common or many redox features

  8. Texture – Ksat relationships

  9. Texture – Bulk Density – Porosity Relaionships

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