Abstract
The kinetics of Zn diffusion to a simulated root system was investigated at a controlled rate of exudation of mobile chelating agents through porous ceramic tubes into a soil tagged with 65Zn tracer. The chelating agents enhanced the rate of Zn diffusion from the soil into the simulated root to varying extents depending upon their relative efficiency in increasing the concentration gradient of diffusible Zn. The rat eof Zn diffusion from the soil into the simulated root conformed to pseudo-first order kinetics. The uptake of Zn by wheat plants was significantly increased when a constant flux of DTPA, EDTA and FA (fulvic acid) into the 65Zn labelled soil was maintained during a 60 days growth period. A significant linear regression between the concentration of soluble Zn in soil and its uptake by wheat was observed. The calculated diffusive flux of Zn based on the assumption of a constant concentration of Zn at the root surface bore a curvilinear relationship with Zn uptake by wheat.
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