Paper Information

Journal:   JOURNAL OF WATER AND SOIL (AGRICULTURAL SCIENCES AND TECHNOLOGY)   MARCH-APRIL 2012 , Volume 26 , Number 1; Page(s) 214 To 225.
 
Paper: 

EFFECT OF COMPACTION ON PHYSICAL AND HYDRAULIC PROPERTIES OF A LOAMY SOIL

 
 
Author(s):  RAMEZANI N.*, SAYYAD G., BARZEGAR A.R., HAGHNIA GH., MANSOORI Y.
 
* DEPARTMENT OF SOIL SCIENCE, FACULTY OF AGRICULTURE, AHWAZ UNIVERSITY
 
Abstract: 

Quantitative investigation of soil compaction seem essential to improve agricultural management practices for reducing difficulties related to compaction in the environment and crop production systems. Soil compaction can be significantly reduced with changes in physical and hydraulic characteristics of soil, water infiltration and availability of air and water to plants. Sum effects of the above may lead to reduced soil quality. This research was performed to study the effect of compaction on physical and hydraulic properties of a loamy soil in Khuzestan province in southern Iran. 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. Physical parameters such as; bulk density, total porosity, Mean Weight Diameter index and soil moisture characteristic. hydraulic parameters including hydraulic conductivities (saturated and unsaturated), number of pores and percent flow through them with effective porosity was determined in the field using disc infilterometer in four potentials (0, -3, -5 and -15 cm of water). Our Results revealed that soil physical and hydraulic properties changed significantly (P<0.01) with compaction. This effect was highest with eight times tractor passing. Soil bulk density in this treatment showed a increased 5.5 percent compared to blank. The value of total porosity and aggregates greater than one millimeter decreased 6 and 70 percent respectively with 8 tractor passings when compared to blank. Results of disc Infilterometer showed that coarse and medium size pores, percent flow through pores and saturated and unsaturated hydraulic conductivities of 8 times tractor passings relative to blank decreased 85, 62.5, 47, 71, 66.5 percent respectively. The highest compaction effect was observed at 0-20 cm depth. From this depth downward no changes was seen in soil physical characteristics due to compaction.

 
Keyword(s): KHUZESTAN, MWD INDEX, PERCENT FLOW THROUGH PORES
 
References: 
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