1. GES166/266, Soil Chemistry
Lecture 1, Introduction

2. Salt Affected Soils

3. Acid Soils

4. Saturated Soil
(wetland)

5. Parent Material ¾¾¾¾¾¾¾® Soil
primary secondary
minerals minerals

6. Parent Material ¾¾¾¾¾¾¾® Soil

7. Entisol
- rich in primary mineral relics

8. Mollisol
- rich in 2:1 phyllosilicate clay minerals and OM

9. Vertisol
- 2:1 minerals with high shrink-swell

10. Alfisol (with a duripan)
- increased weathering but 2:1 minerals still dominate; 1:1 minerals are creeping in, however.

11. (California State Soil)
Alfisol
(California State Soil)
Durixeralf

12. Ultisol
- 1:1 minerals and ‘oxides’ now are becoming a dominant feature

13. Oxisol
- Oxides of Al and Fe dominate the soil profile

14. Andisol
- volcanic ash

15. Spodosol
- evidence of the role O.M. and climate have on soil development

16. Histosol

17. EXPECTED ION CORRDINATION

18. BOND VALENCE

19. BOND VALENCE

20. BUILDING BLOCKS

21. APICAL TETRAHEDRAL LINKAGE

22. BASAL TETRAHEDRAL LINKAGES

23. ALTERNATING TETRAHEDRAL LINKAGES

24. Si6O18

25. Si6O18
Polyhedral View

26. CORNER-SHARING
OCTAHEDRA

27. EDGE-SHARING OCTAHEDRA