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\hypersetup{pdftitle={The Effects of Humic Acid Applications on Cadmium Bioavailability in Soil and Cadmium Accumulation in Tomato (\textit{Lycopersicon esculentum} L.)},pdfauthor={Bülent Topcuoglu},pdfsubject={Tropentag 2010: Abstract},pdfkeywords={Cadmium, humic acid, tomato},pdfpagemode=None,colorlinks=true}
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\parbox[b]{13.4cm}{\centering \large{\textbf{Tropentag, September 14-16, 2010, Zurich}}\\[1ex] \Large{``World Food System  ---\\A Contribution from Europe''\\[2ex]}}
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\Large{\textbf{The Effects of Humic Acid Applications on Cadmium Bioavailability in Soil and Cadmium Accumulation in Tomato (\textit{Lycopersicon esculentum} L.)\footnote{\textbf{Contact Address:} Bülent Topcuo\u{g}lu, Akdeniz University, Vocational High School of Technical Sciences Environmental Pollution and Control Department, Dumlupinar Bulvari; Kampüs, 07058~Antalya, Turkey, \mbox{e-mail}: \email{btoglu@akdeniz.edu.tr}}\\[0.8ex]}}
\normalsize{\textsc{Bülent Topcuo\u{g}lu}}
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\begin{itemize*}
\item[]{\small{\textit{Akdeniz University, Vocational High School of Technical Sciences Environmental Pollution and Control Department, Turkey}}}
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\index[author]{Topcuo\u{g}lu, Bülent}
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\textbf{Abstract}
\begin{abstract}
\normalsize{
A pot experiment was conducted to determine the effects of soil application of humic acid on changes of Cd bioavailability and Cd accumulation in aboveground tomato biomass were studied in greenhouse conditions. 



Humic acids isolated from leonardite were added to soil (pH, 7.62) in order to enhance the soil organic carbon content by 0, 1 and \mbox{2\,\%}.  Humic acid treated soil samples were further added with solutions of Cd to reach 0, 25 and 50 $\mu$g g$^{-1}$. Treated soils were allowed to 6 months incubation. Tomato seedlings were allowed to grow in incubated soils for 60 days. Plant dry weight and Cd content of tomato were determined after harvest. Soil samples were collected before and after treatments and total and DTPA (diethylenetriaminepentaacetic acid)-extractable Cd contents of treated soils were determined.



It was found that the Cd applications brought about a sharp increase in Cd content in the plant material. Cd uptake of tomato plant increased with soil available Cd content. Positive effect of the humic acid applications in tomato growth was observed. Dry matter contents of tomato were increased by increasing applications rates of humic acid. Humic acid applications increased total organic carbon and reduced DTPA-extractable Cd concentrations in treated soil. Humic acid treatments were efficiently immobilised the DTPA extractable form of Cd in the soil. Retention capacity was positively correlated with amount of added humic acid. Results indicate that humic substances can be useful amendment for the reduction of metal toxicity to plants and for soil remediation in heavy metal polluted soils.



}

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\noindent \textbf{Keywords:} Cadmium, humic acid, tomato
\index[key]{Cadmium}
\index[key]{Humic acid}
\index[key]{Tomato}
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