soils: the real dirtminerals: sand, silt, clay soil fraction diameter description surface area (1 g)...
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SOILS: the real dirt
Sevier CTE Center, Feb. 2020Dr. Dianne Farrer
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Other Aspects of Soil Science we don’t have time to explore …..
● Soil Fertility
● Soil Salinity
● Soil Taxonomy
● Soil Physics
● Soil Formation
● Soil Morphology
● Soil Microbiology
● Soil Conservation
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What are soils?
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Minerals:Sand, Silt, Clay
Soil Fraction
Diameter Description Surface Area (1 g)
Sand 0.05 - 2 mm gritty 11 cm2
Silt 0.002 - 0.05 mm floury 1130 cm2
Clay smaller than 0.002 mm sticky when wet 113,000 cm2
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Minerals: Sand, Silt, Clay
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Soil Organic Matter (SOM)
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Additional Soil Properties:
Soil pH
Soil fertility
Soil cation exchange capacity (CEC)
Soil salts (EC & SAR)
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Buffering
Resistant to
change
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Soil Fertility & Soil pH
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Soil Fertility16 Essential Nutrients:
● NON-Mineral Nutrients○ C - carbon
○ H - hydrogen
○ O - oxygen
● Primary Nutrients○ N - nitrogen
○ P - phosphorus
○ K - Potassium
● Secondary Nutrients○ S - sulfur
○ Ca - calcium
○ Mg - magnesium
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Soil Fertility
● Micro-Nutrients○ Fe - iron
○ Zn - zinc
○ Mn - manganese
○ Cu - copper
○ B - Boron
○ Cl - chloride
○ Mo - molybdenum
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Name That Plant Nutrient Deficiency/Toxicity
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Calcium
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Potassium
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Nitrogen
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Sulfur
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Phosphorus
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Magnesium
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MICRO-NUTRIENTS
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Iron
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Zinc
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Manganese
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Copper
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Molybdenum
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Boron
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Chlorine
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Soil Organic Matter (SOM)