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Title:Study of Effect of Refined Waste Water Application on Trend of Changes in Certain Soil Chemical Properties in Khouzestan, Iran Authors: Mina Omidbakhsh; Alireza Jafarnejadi; Ali Gholami; Seyed Mohammadhadi Mosavifazl DOI: Aff: Department of Soil Science, Science and Research Branch, Islamic Azad University, Khouzestan, Iran Author Email: Keywords: Irrigation; Soil Chemical Properties; Urban Sewage; Wheat; Khuzestan (Iran). URLs:ABSTRACT-HTML | FULLTEXT-PDF | Abstract:Today, water scarcity and declining water quality lead to use of unconventional water in farming including wastewater and urban sewage. In order to examine how wastewater irrigation possibly affect trend of changes in calcareous soil chemical properties, a field experiment has been carried out at Ahvaz Experimental Station (AES) during 2010-2011. The experiment was laid out under RCBD with five treatments and three replications. Composite soil samples were collected according to growth stages of wheat at 0-30cm depth interval of topsoil. The experimental treatments were %100 ordinary water (T1), %75 ordinary water+ %25 wastewater (T2), %50 ordinary water+%50 wastewater (T3), %25 ordinary water+ %75 wastewater (T4), and %100 wastewater (T5). Chemical analysis of wastewater revealed that electrical conductivity exceeded allowable range; however, wastewater pH remained in the permissible range. The concentration of chloride ion and trace elements in studied wastewater significantly exceeded permissible ranges recommended by FAO for irrigation practice. It was also indicated that use of refined urban sewage increased soil salinity (%40), organic carbon (%1.5), absorbable phosphorus (%41), zinc (%1.7), manganese (%7) considerably compared to initial parameters, whereas it did not affect on pH variation and copper concentration. In general, the results approved use of refined wastewater as a fair alternative for ordinary water.