changes in characteristics related to copper release in wheat (triticum aestivum. l) rhizosphere in some calcareous soils

abstract rhizosphere is a small zone with chemical, physical, and biological properties different from those of the bulk soil. information regarding the kinetics of cu release in the rhizosphere soil is scant. throughout this research, kinetics of cu release was investigated in wheat crop rhizosphere vs. non-rhizosphere in 10 calcareous soils by use of rhizobox and in greenhouse conditions. extracts from rhizosphere and non-rhizosphere soil samples were obtained through successive extraction with dtpa-tea for 1 to 504 h at 25±1 oc. the available cu was assessed using chemical extractants (dtpa-tea, ab-dtpa and mehlich 3). the results indicated that the level of cu extracted by chemical extractions from the rhizosphere was lower than those extracted from the nonrhizosphere soils. also, the level of cumulative released cu from the rhizosphere was significantly (p