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Chapter 10. Soil Fertility. 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. Adsorption

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Chapter 10

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Chapter 10 l.jpg

Chapter 10

Soil Fertility

Soil Science & Management, 4E


Objectives l.jpg

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

Soil Science & Management, 4E


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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

Terms to Know

Soil Science & Management, 4E


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Primary macronutrient

Root interception

Secondary macronutrient

Sesquioxide

Silicate clay

Soil fertility

Soil solution

Trace element

Terms to Know

Soil Science & Management, 4E


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Plant Nutrients

  • Nutrient ions

Figure 10-1

Soil Science & Management, 4E


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Sources of Elements in Soil

  • Soil minerals

  • Organic matter

  • Adsorbed nutrients

  • Dissolved ions

Soil Science & Management, 4E


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Soil Colloids

  • Silicate clays

Figure 10-4

Soil Science & Management, 4E


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Soil Colloids: Silicate Clays

Figure 10-5

Soil Science & Management, 4E


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Soil Colloids: Silicate Clays

Figure 10-6

Soil Science & Management, 4E


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Soil Colloids: Silicate Clays

Figure 10-7

Soil Science & Management, 4E


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Types of Silicate Clay

Figure 10-9

Soil Science & Management, 4E


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Characteristics of Silicate Clays

Figure 10-10

Soil Science & Management, 4E


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Types of Silicate Clays

  • Mica clays

  • Smectite clays

  • Chlorite clays

  • Kaolinite clays

Soil Science & Management, 4E


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Types of Silicate Clays

  • Oxide clays

  • Humus

  • Charged colloids

Figure 10-11

Soil Science & Management, 4E


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Cation Exchange

Figure 10-12

Soil Science & Management, 4E


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Cation Exchange

Figure 10-13

Soil Science & Management, 4E


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Cation Exchange

Figure 10-14

Soil Science & Management, 4E


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Cation Exchange

  • Anion storage

Figure 10-15

Soil Science & Management, 4E


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Cation Exchange

  • Percent base saturation

Soil Science & Management, 4E


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Nutrient Uptake

Figure 10-16

Soil Science & Management, 4E


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Factors affecting uptake

Nutrient Uptake

Figure 10-17

Soil Science & Management, 4E


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Nutrient Uptake

  • Factors affecting uptake

Figure 10-18

Soil Science & Management, 4E


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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

Soil Science & Management, 4E


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