Soils 205-90

Lecture 16- Potassium

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A. Soil-Plant Relations

1. Osmotic and water relations

2. Enzyme functions

3. General plant health

4. Third "fertilizer" element

- large portion unavailable

- subject to leaching

- luxury consumption by plants

B. Nonexchangeable K⁺ forms - "fixed" by colloids

1. illite and mica type interlayer K⁺

2. vermiculite>smectite>>>other minerals

3. similar to NH₄⁺ fixation

C. Forms and Availability

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