1. What are the soil structural aggregates called?
2. What is the main cause of dispersion in soils?
3. What soil ameliorant could be added to (a) sodic (b) acidic (c) alkaline soils?
4. Describe the appearance of a typical recharge area.
5. Describe two visible signs of saline soils.
6. What is the chief cause of salinity in Australian soils?
7. What is the limiting nutrient in most Australian soils?
8. How does irrigation affect soil quality?
9. Name two ways of lessening the effect of soil salinity on agricultural land.
10. Name two benefits and two problems with using biosolids as soil ameliorants.
11. Name two effects on soils of adding compost.
12. What type of erosion can occur in desert regions and why?
13. How does soil erosion affect aquatic life in streams?
15. What are two farming practices that can reduce soil erosion?
16. What is soil ‘porosity' and why is it important?
17. Name two types of peds formed in soil.
18. What effect does the grazing of animals such as cattle have on soil quality?
19. Describe two problems caused by sedimentation in inland waters.
20. Why does stubble retention reduce erosion of sandy soils?
21. What effect does soil particle shape and size have on wind erosion?
22. How do aggressive tillage practices affect wind erosion?
23. Describe one method of controlling gully erosion.
24. What is ‘zero tillage' and how does it benefit the soil?
25. What are the 4 types of water erosion of soil? Briefly describe each type?
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