How does Na affect dispersion of soil particles How do you use a textural

How does na affect dispersion of soil particles how

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How does Na + affect dispersion of soil particles? How do you use a textural triangle to identify the soil textural class? Is soil organic matter content a part of soil texture? What is humus? What is the textural class of a soil that contains 25% sand, 45% silt, and 5% organic matter?
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What are the three components of the Munsell color system, and what does each describe? Write an example of a Munsell color notation and identify the three components. What are hematite, goethite, and gibbsite? What color does each usually impart to soils? What causes some soil horizons to be white or very light gray? Black? What are redox depletions, redox concentrations, and reduced matrix? How are they related to soil wetness and anaerobic soil conditions? What are peds? What are the shapes of peds (type of soil structure)? What are the main soil constituents that hold peds together? How is soil structure related to soil porosity? How does aggregate stability affect infiltration rate and surface run-off? Soils are three-phase systems. What does this phrase mean? Explain the terms saturation, field capacity, permanent wilting point, plant available water, gravitational water, capillary water, and hygroscopic water in relation to soil water?
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  • Fall '08
  • Staff
  • Munsell, gravitational water, redox depletions

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