Emami, Hojat, Neyshabouri, Mohammad Reza, Shorafa, Mahdi (2012). Relationships between Some Soil Quality Indicators in Different Agricultural Soils from Varamin, Iran. , 14(4), 951-959.
Hojat Emami; Mohammad Reza Neyshabouri; Mahdi Shorafa. "Relationships between Some Soil Quality Indicators in Different Agricultural Soils from Varamin, Iran". , 14, 4, 2012, 951-959.
Emami, Hojat, Neyshabouri, Mohammad Reza, Shorafa, Mahdi (2012). 'Relationships between Some Soil Quality Indicators in Different Agricultural Soils from Varamin, Iran', , 14(4), pp. 951-959.
Emami, Hojat, Neyshabouri, Mohammad Reza, Shorafa, Mahdi Relationships between Some Soil Quality Indicators in Different Agricultural Soils from Varamin, Iran. , 2012; 14(4): 951-959.

Relationships between Some Soil Quality Indicators in Different Agricultural Soils from Varamin, Iran

Journal of Agricultural Science and Technology
Article 23, Volume 14, Issue 4, 2012, Pages 951-959    PDF (138.66 K)
Authors
Hojat Emami* 1; Mohammad Reza Neyshabouri2; Mahdi Shorafa3
1Author (Asistant Professor)
2Professor
3Asistant professor
Abstract
Soil quality is a necessary indicator of land management. Different indices are applied to evaluate farming systems, soil types and land uses based on soil quality. The slope of retention curve at its inflection point has been defined as soil physical quality index (Si) but the relationships between Si and penetration resistance (PR), the least limiting water range (LLWR), and available water content (AWC) have not been studied yet. In this study, I) the effects of soil physical properties on Si index and PR, and II) the relationships between Si index and PR, LLWR, and AWC were investigated. Seventy undisturbed soil samples were collected and the slope at inflection point for soil retention curve as a soil physical quality index (Si) was determined in each sample using soil retention curve data. Furthermore, PR was measured in soil surface, and LLWR and AWC were calculated. The results showed that the correlations between PR and water content, Electrical conductivity (ECe), SAR, and Si index were significant at P<0.01, whereas its correlations with bulk density (ρb), and organic matter (OM) were significant at P<0.05. There was also a negative correlation found between AWC and PR (P<0.01). In addition, a positive correlation between Si and LLWR, and a negative correlation between PR and LLWR among soil samples (P<0.01) were found to exist. Therefore, the Si index provides a tool that can be used to compare different soils or the effects of different management practices on soil physical properties.
Keywords
Available water content; Least limiting water range; Penetration resistance; Soil physical quality index
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