Introduction to Soil Chemistry

90 soil basics iv
4.6. What role would Kd play in the extraction of a component from soil?
4.7. Using any available resources, describe how pressure place methods of
determining soil moisture levels work.
4.8. Explain why tensionmeters and porous block methods are most useful
in the field.
4.9. A soil sample is taken from a field. Half the sample, 50g, is dried at 105°C
for 24h, after which time it is found to weigh 45g. What is the percent
moisture of this soil sample on a dry-weight basis?
4.10. The undried soil sample in Problem 4.9 is extracted, analyzed for phosphate,
and found to contain 5mg of phosphate. What is the concentration
of phosphate on a dry-weight basis?
BIBLIOGRAPHY
Coyne M. Soil Microbiology:An Experimental Approach. Cincinnati, OH: Delmar Publishers,
p. 16, 1999.
Harper L, Sharpe RR, Scarbrough J, Thornton M, Caddis P, Hunter M, Miller C.
Soil–plant–animal–atmosphere research. http://www.spcru.ars.usda.gov/
SPAA.html.
Hillel D. Soil and Water Physical Principles and Processes. New York: Academic Press,
1971.
Warrick AW. Soil Water Dynamics. New York: Oxford Univ. Press, 2003.
REFERENCES
1. Brady NC, Weil RR. The Nature and Properties of Soil. Upper Saddle River, NJ:
Prentice-Hall, pp. 171–212, 1999.
2. Jacinthe PA, Lal R. Effects of soil cover and land-use on the relations fluxconcentrations
of trace gases. Soil Sci. 169:243–259, 2004.
3. Rolston DE. Gas flux. In Methods of Soil Analysis, Part 1: Physical and Mineralogical
Methods, 2nd ed., Klute A (ed.). Madison, WI: Soil Science Society of
America, American Society of Agronomy, pp. 1103–1120, 1994.
4. Corey AT. Air Permeability. In Methods of Soil Analysis, Part 1: Physical and Mineralogical
Methods, 2nd ed., Klute A (ed.). Madison, WI: Soil Science Society of
America, American Society of Agronomy, pp. 1121–1136, 1994.
5. Brady NC, Weil RR. Elements of The Nature and Properties of Soils. Upper Saddle
River, NJ: Prentice-Hall, 1999.
6. Bohn HL, McNeal BL, O’Connor GA. Soil Chemistry, 3rd ed. New York: Wiley,
pp. 217–229, 2004.
7. Sparks DL. Environmental Soil Chemistry, 2nd ed. New York: Academic Press,
pp. 115–132, 2003.