Page 113 - Enzymes in Tropical Soils

Enzymes in Tropical Soils 101

7. What are the roles of soil porosity and pore size distribution in controlling the soil
water content? Explain!
8. Describe the differences between the soil field water capacity, permanent wilting
point, and available water!
9. Describe the available water in relation to the clay content! Use a graph to indicate
the gravitation water, the available water, and the unavailable water!
10. Explain the dynamics of soil water in relation to gravitation water and capillary
water!
11. Explain the soil heating in relation to soil color, soil water, soil cover, soil depth, and
direction of sunlight!
12. Explain the changes in soil temperature in relation to soil depth! Use a graph!
13. Explain the equilibrium between the dissolved and adsorbed soil enzymes! What
factors are involved? Explain!
14. Explain the relationship between the populations and activities of soil
microorganisms with soil water!
15. Explain the relationship between the populations and activities of soil
microorganisms with soil temperature!
16. Explain the effect of forest degradation and land-use changes on the soil
temperature and/or soil water! Explain their effects on the soil enzymatic activities!
17. Why is the soil water significantly important for the decomposition of organic
matters in the soil water system! Use the decomposition of organic P and organic S
as examples!
18. Explain the influence of soil water content on the rates of soil biochemical reactions!
19. Explain the influence of soil temperature on the rates of soil biochemical reactions!
20. Explain the effect of soil water content or soil temperature above their optimum
values on the rates of soil biochemical reactions!
21. Explain the method to increase or lower the rates of soil biochemical reactions with
soil temperature management!
22. Explain the method to increase or lower the rates of soil biochemical reactions with
soil water management!
23. Explain the role of mulches to control the rates of soil biochemical reactions!
24. Explain the role of soil color to control the rates of soil biochemical reactions!
25. Explain the role of soil cover to control the rates of soil biochemical reactions!
26. Explain the role of greenhouse to control the rates of soil biochemical reactions!

Abdul Kadir Salam - 2014