Study of Compaction Effect on the Active Pores on Conductivity Water of the Loamy Soil Using Disk Infiltrometer

Document Type : Research Paper

Authors

1 MSc Student of Soil Science, Faculty of Agriculture, Shahid Chamran University

2 Assistant Professor, Department of Soil Science, Faculty of Agriculture, Shahid Chamran University

3 Professor, Department of Soil Science, Faculty of Agriculture, Shahid Chamran University

4 Assistant Professor, Department of Agriculture Mechinery Engineering, Faculty of Agriculture,Shahid Chamran University

Abstract

The major topic in the study of the compaction
is the soil pore size and type. Soil compaction can be significantly reduced with changes in soil pore
volume, water infiltration and availability of plants to air and water. Sum
effects of the above may lead to reduced soil quality.
Therefore a field study
was performed to evaluate the effect of soil
compaction on movement of water
in the pores (coarse
and medium size pores) of loamy soil. A
completely randomized block was designed with three replications, applying blank
(No teraffic passing), once, twice, three times, four times and eight times of
tractor passings. Number of pores and percent flow through them with effective
porosity and hydraulic conductivities (saturated and unsaturated), was
determined in the field using disc infilterometer in four potentials (0, -3, -5
and -15 cm of water). Our results revealed thatin all of the treatments medium size pores
were many times of large ones hence,
both sizes decreased with compaction. Results of disc Infilterometer showed
that coarse and medium size pores (macro and meso pores) of eight times tractor
passings relative to control decreased 85 and 62.5 percent respectively. The majoreffect of compaction
was onthelarge size pores. The
mediumpore sizewasmore
impressed than
large pore size. Number
of medium poresin
the soil was
less than large ones.

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History

  • Receive Date: 28 February 2011
  • Revise Date: 07 March 2014
  • Accept Date: 10 January 2012
  • Publish Date: 21 May 2012

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