1. Soil Science & Management, 4E
Chapter 10
Soil Fertility
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Soil Science & Management, 4E

2. Soil Science & Management, 4E
Objectives
Name and classify the essential elements
List four sources of nutrients in the soil
Describe soil colloids
Define cation exchange capacity and related terms
Describe how plants absorb nutrients
Explain other soil fertility factors
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3. Soil Science & Management, 4E
Terms to Know
Adsorption
Anion exchange
Base saturation
Beneficial elements
Cation exchange
Cation exchange capacity
Colloid
Diffusion
Essential elements
Exchangeable bases
Expanding clays
Isomorphous substitution
Luxury consumption
Macronutrients
Mass action
Mass flow
Micelle
Micronutrient
Nonexchangeable ions
Oxide clays
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4. Soil Science & Management, 4E
Terms to Know
Primary macronutrient
Root interception
Secondary macronutrient
Sesquioxide
Silicate clay
Soil fertility
Soil solution
Trace element
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5. Soil Science & Management, 4E
Plant Nutrients
Nutrient ions
Figure 10-1
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6. Sources of Elements in Soil
Soil minerals
Organic matter
Adsorbed nutrients
Dissolved ions
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7. Soil Science & Management, 4E
Soil Colloids
Silicate clays
Figure 10-4
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8. Soil Colloids: Silicate Clays
Figure 10-5
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9. Soil Colloids: Silicate Clays
Figure 10-6
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10. Soil Colloids: Silicate Clays
Figure 10-7
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11. Soil Science & Management, 4E
Types of Silicate Clay
Figure 10-9
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12. Characteristics of Silicate Clays
Figure 10-10
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13. Types of Silicate Clays
Mica clays
Smectite clays
Chlorite clays
Kaolinite clays
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14. Types of Silicate Clays
Oxide clays
Humus
Charged colloids
Figure 10-11
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15. Soil Science & Management, 4E
Cation Exchange
Figure 10-12
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16. Soil Science & Management, 4E
Cation Exchange
Figure 10-13
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17. Soil Science & Management, 4E
Cation Exchange
Figure 10-14
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18. Soil Science & Management, 4E
Cation Exchange
Anion storage
Figure 10-15
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19. Soil Science & Management, 4E
Cation Exchange
Percent base saturation
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20. Soil Science & Management, 4E
Nutrient Uptake
Figure 10-16
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21. Soil Science & Management, 4E
Nutrient Uptake
Factors affecting uptake
Figure 10-17
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22. Soil Science & Management, 4E
Nutrient Uptake
Factors affecting uptake
Figure 10-18
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23. Soil Science & Management, 4E
Summary
Sixteen or seventeen essential elements
Sources of nutrients:
Soil minerals
Organic matter
Soil solution
Adsorption by clay and humus
Absorb by transporting ions
Some factors interfere
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Soil Science & Management, 4E