Author/Authors :
hurayga, talib saber directorate of agriculture in dhi qar, iraq , chlaib, hussein khalefa university of sumer - collage of agriculture - department of soil sciences and water resources , beedeh, riyadh shaker university of sumer - collage of agriculture - department of soil sciences and water resources , kazim, batool hatif university of sumer - collage of agriculture - department of soil sciences and water resources
Abstract :
The study was conducted in Al-Rifai district, Dhi Qar province, which located between two latitude(2944‾31° and 50 44‾31°) and two longitude line (25 06‾46° and 2707‾46°) for the purpose ofidentifying and comparing spatial Variability in the properties of morphological and physiochemical soilwithin different physiologic units in the lower sedimentary plain in southern Iraq. The soil sampleswere collected from three pedons represented by the traces of the river, river banks and river basin inthree locations parallel to Al-Gharaf River which located within Al-Rifai district, Dhi Qar provinceduring the period from November 2015 to April 2016. The results of the physical analyzes showed thatthe predominant textures were sandy loam and loam, with a percentage of 33.34% for each of them, Thegeneral average for apparent density values for the pedons (1, 2, 3) amounted to (1.50, 1.48, 1.43 μg.m3), respectively. The saturated Hydraulic Conductivity of all the pedons was classified on the basis oftheir general averages to the medium velocity class according to an assessment [20]. The results of thechemical analysis showed that the soil of the first pedon recorded the highest content of the organicmatter amounted to (6.43 g.kg-1) followed by the second pedon amounted to (4.08 g.kg-1) while the soilof the third pedon recorded the lowest content amounted to (2.65 g.kg-1), all locations showed highcontent of calcium carbonate, with an average of (219 g.kg-1) within a range of (262-168 g.kg-1). Theresults showed that the lowest Coefficient of Variance recorded for the traits of the pH, apparent density,porosity, and calcium carbonate levels amounted to (2.25, 6.04, 7.16, 12.41%), respectively, indicatinga slight Covariance and state of homogeneous, while there were medium Covariance and state ofheterogeneous for the traits represented by the sand, silt, clay, the salinity, and the Saturated HydraulicConductivity, where the Coefficient of Variance for these traits amounted to (31.39, 34.24, 35.30, 47.06,54.30%), respectively. The results of the field and laboratory studies showed that the soil of theselocations belongs to the subgroup (Typic Torrifluvents).
Keywords :
Morphology , Texture , Pedon , Sedimentary plain
