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Title

EVALUATION OF THE RELATIONSHIPS BETWEEN CU CHEMICAL FORMS AND CU UPTAKE BY SOYBEAN IN SEVERAL CALCAREOUS SOILS IN FARS PROVINCE

Pages

 Start Page 183 | End Page 198

Abstract

 Determination of COPPER CHEMICAL FORMS is one of the accurate methods to study the status of this element (Cu) in the soil. Assessment of the relationships between the CHEMICAL FORMS and soil characteristic helps describe the chemical changes of COPPER in the soil. In this study, 10 surface soil samples (0-30 cm) were collected from different fields in Fars Province with a wide range of physical and chemical properties. A after preparing soils, various CHEMICAL FORMS of COPPER in soil were measured by sequential extraction method. CHEMICAL FORMS of COPPER in the soil were in the following order: CuEx=CuMnO=ND<CuCa=5%<CuAFe=6%< CuOM=13%<CuCFe=28%<CuRe=48%. The aerial parts of Soybean plants were harvested for 8 weeks after plant emergence. With measuring the CONCENTRATION and TOTAL UPTAKE of COPPER in soybean shoots, observed that of abovementioned forms, organic (CuOM) and carbonate (CuCa) forms, had the strongest correlations with COPPER in soybean shoots. These forms showed positively significant correlations with Cu CONCENTRATIONs extracted by DTPA and EDTA (P<0.01). The comparison between different CHEMICAL FORMS of COPPER, indicated that the organic form was positively correlated with the carbonate form.Furthermore, the form connected to the amorphous iron oxides (CuAFe) showed a positive correlation with all of the CHEMICAL FORMS except for organic and carbonate forms. The strongest correlation among the different forms was obtained between amourphous iron oxids and crystaline iron oxides.

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