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Effects of Soil Compaction and Macropores on Water Infiltration Rates. By Lanre Adekola. Problems. Soil becomes hard like concrete when construction equipment is driven repeatedly over soil There is a decrease in vegetative growth Poor infiltration rates lead to runoff Nitrates Phosphates

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effects of soil compaction and macropores on water infiltration rates

Effects of Soil Compaction and Macropores on Water Infiltration Rates

By Lanre Adekola

problems
Problems
  • Soil becomes hard like concrete when construction equipment is driven repeatedly over soil
  • There is a decrease in vegetative growth
  • Poor infiltration rates lead to runoff
    • Nitrates
    • Phosphates
    • Oils and greases
    • Salts from ice removal
methods infiltration rates
Methods: Infiltration Rates

Modified Philip-Dunne Infiltrometer (MPD)

goals compaction study
Goals: Compaction Study
  • To determine the soil type at the study site
methods
Methods

Determining Soil Type

methods1
Methods

Determining Soil Type

methods2
Methods

Determining Soil Type

CaCO3 Content

results for soil type
Results for Soil Type
  • Sandy Loam
    • Brown, R. B. "Soil Texture." Electronic Data Information Source. 2008. University of Florida. 6 Oct. 2008 <http://edis.ifas.ufl.edu/ss169>.
goals compaction study1
Goals: Compaction Study
  • To determine the soil type at the study site
  • To measure infiltration rates of the compacted soil
comparison with rain garden infiltration1
Comparison with Rain Garden Infiltration

Lake Minnetonka has 3.5 times worse infiltration Rates

goals compaction study2
Goals: Compaction Study
  • To determine the soil type at the study site
  • To measure infiltration rates of the compacted soil
  • To determine how water infiltration is affected by bulk density
comparison of compaction levels vs soil type shestak et al 2005
Comparison of Compaction Levels vs. Soil Type (Shestak et al. 2005)

Shestak, C. J. and M. D. Busse. "Compaction Alters Physical but not Biological ices of Soil Health." Soil Society of America (2005): 236-46.

comparison of compaction levels vs soil type shestak et al 20051
Comparison of Compaction Levels vs. Soil Type (Shestak et al. 2005)

Shestak, C. J. and M. D. Busse. "Compaction Alters Physical but not Biological ices of Soil Health." Soil Society of America (2005): 236-46.

comparison of compaction levels vs soil type shestak et al 20052
Comparison of Compaction Levels vs. Soil Type (Shestak et al. 2005)

Minnetonka Regional Park = 1.477 g/cm3

Shestak, C. J. and M. D. Busse. "Compaction Alters Physical but not Biological ices of Soil Health." Soil Society of America (2005): 236-46.

definition of macropore
Definition of Macropore
  • Pockets of air found in soil that may influence infiltration
  • Caused by earthworms and hollowed tree roots
    • Jury, W. A. and Horton, R. Soil Physics. 6th ed. John Wiley & Sons, Inc: Hobeken, New Jersey, 2004
goals macropore study
Goals: Macropore Study
  • Design and create macropore simulators
goals macropore study1
Goals: Macropore Study
  • Design and create macropore simulators
  • Determine how number of macropores affects infiltration rates
methods devices used for macropores
Methods: Devices Used for Macropores

5 cm diameter MPD

Minidisk Infiltrometer

Moisture Content Device

limitations
Limitations
  • Presence of rocks and macropores in soil at Lake Minnetonka may have affected infiltration
  • Presence of small trees and shaded areas affected infiltration
  • Time between macropore flood tests varied, affecting drying rate of soil
  • Size and number of macropores may have produced unreliable results
conclusion
Conclusion
  • Soil compaction is directly related to poor water infiltration
  • Poor infiltration is leading to runoff
  • In the absence of macropores, infiltration rates at Lake Minnetonka could be even worse
future work
Future Work
  • Tilling/aerating
  • Composting
  • Testing water for chemical content, before and after tilling/aerating and composting
acknowledgments
Acknowledgments

Dr. Gulliver

Nick Olsen

Greta Schmalle

Science Research Class

Mrs. Fruen

effects of soil compaction and macropores on water infiltration rates1

Effects of Soil Compaction and Macropores on Water Infiltration Rates

By Lanre Adekola

results for soil type1
Results for Soil Type
  • Sandy Loam

http://edis.ifas.ufl.edu/ss169