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Fluid Journal : Fluid Journal 2008-2009
in the form of Zn rhamnolipid at spots A and B, respectively (Figure 3, bottom). These results suggest that Zn-rhamnolipid complexes may have been absorbed intact by roots, possibly due to the lipophilic properties of these complexes. Conclusions EDTA, DTPA and other chelates that form anionic complexes with cationic micronutrients are effective in solubilizing these elements in soil but ineffective in allowing them to be taken up by plant roots. Addition of these chelates to fluid fertilizer blends may increase the micronutrient solubility in the blend, but the resultant form of micronutrient is not one that crops can easily use. New types of chelates, which do not form anionic micronutrient complexes, have the potential not only to increase the solubility of micronutrients but also retain them in forms that are readily available to plant roots. The fact that some of these products have lipophilic properties is an added advantage, as they appear to be able to be readily transported (intact) into the plant root. Figure 3. Zinc x-ray fluorescence maps showing the distribution of Zn in a canola root treated with Zn-EDTA (top), ZnSO4 (middle), and Zn- rhamnolipid (bottom). Speciation of Zn forms was undertaken at the XAS spots marked. Stacey, 2007. Mike McLaughlin is a chief research scientist, CSIRO Land and Water, and Professor at the University of Adelaide; and Dr. Stacey is a senior research fellow, Soil and Land Systems, University of Adelaide, Glen Osmond SA 5064. Australia.
Fluid Journal 2005-2007