Effects of soil compaction and macropores on water infiltration rates
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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 Infiltration Rates

  • 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 Infiltration Rates

Modified Philip-Dunne Infiltrometer (MPD)


Methods laying out study area
Methods: Laying out Study Area Infiltration Rates


Goals compaction study
Goals: Compaction Study Infiltration Rates

  • To determine the soil type at the study site


Methods
Methods Infiltration Rates

Determining Soil Type


Methods1
Methods Infiltration Rates

Determining Soil Type


Methods2
Methods Infiltration Rates

Determining Soil Type

CaCO3 Content


Results for soil type
Results for Soil Type Infiltration Rates

  • 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 Infiltration Rates

  • To determine the soil type at the study site

  • To measure infiltration rates of the compacted soil



Results infiltration rates
Results: Infiltration Rates Infiltration Rates



Comparison with rain garden infiltration1
Comparison with Rain Garden Infiltration Infiltration Rates

Lake Minnetonka has 3.5 times worse infiltration Rates


Goals compaction study2
Goals: Compaction Study Infiltration Rates

  • 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


Methods bulk density
Methods: Bulk Density Infiltration Rates



Methods bulk density samples
Methods: Bulk Density Samples Infiltration Rates


Results bulk density
Results: Bulk Density Infiltration Rates


Comparison of compaction levels vs soil type shestak et al 2005
Comparison of Compaction Levels vs. Soil Type ( Infiltration RatesShestak 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 ( Infiltration RatesShestak 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 ( Infiltration RatesShestak 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 Infiltration Rates

  • 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 Infiltration Rates

  • Design and create macropore simulators


Methods macropore simulator
Methods: Macropore Simulator Infiltration Rates


Goals macropore study1
Goals: Macropore Study Infiltration Rates

  • Design and create macropore simulators

  • Determine how number of macropores affects infiltration rates


Methods devices used for macropores
Methods: Devices Used for Macropores Infiltration Rates

5 cm diameter MPD

Minidisk Infiltrometer

Moisture Content Device


Results macropore averages
Results: Macropore Averages Infiltration Rates


Results macropore averages1
Results: Macropore Averages Infiltration Rates


Limitations
Limitations Infiltration Rates

  • 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 Infiltration Rates

  • 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 Infiltration Rates

  • Tilling/aerating

  • Composting

  • Testing water for chemical content, before and after tilling/aerating and composting


Acknowledgments
Acknowledgments Infiltration Rates

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 Infiltration Rates

  • Sandy Loam

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


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