Change in Bioavailability and Fractions of Copper in the Rhizosphere of Wheat (Triticum aestivum L.) in Some Calcareous Soils

Rhizosphere is a small zone and has quite different chemical، physical and biological properties from bulk soil. This research was conducted to investigate the availability and fractionation of copper in the wheat rhizosphere and bulk soils by using rhizobox at greenhouse conditions. Three seeds of wheat were plant in the rhizobox. After 8 weeks، plants were harvested and rhizosphere and bulk soils were separated. Total organic carbon (TOC)، dissolved organic carbon (DOC)، microbial biomass carbon (MBC) and available Cu (by using 7 chemical procedures) and Cu-fractions were determined in the rhizosphere and bulk soils. The results indicated that TOC، DOC and MBC in the rhizosphere were increased significantly (p)