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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]}}
\hspace{0.1cm}
\begin{center}
\Large{\textbf{\&\#1583;\&\#1575;\&\#1585;\&\#1583;. \&\#1575;\&\#1610;\&\#1606; \&\#1711;\&\#1610;\&\#1575;\&\#1607; \&\#1576;\&\#1575; \&\#1583;\&\#1575;\&\#1585;\&\#1575; \&\#1576;\&\#1608;\&\#1583;\&\#1606; \&\#1576;\&\#1610;\&\#1588; \&\#1575;\&\#1586; 90 \&\#1583;\footnote{\textbf{Contact Address:} Esmat Sarafraz, -, -, 00981237~Tehran, Iran, \mbox{e-mail}: \email{esmatsarafraz@yahoo.com}}\\[0.8ex]}}
\normalsize{\textsc{Esmat Sarafraz}}
\end{center}
\begin{itemize*}
\item[]{\small{\textit{-, -, Iran}}}
\end{itemize*}
\index[author]{Sarafraz, Esmat}
\begin{center}
\vspace{1.1cm}
\textbf{Abstract}
\begin{abstract}
\normalsize{
\&\#1585;\&\#1608;\&\#1594;\&\#1606; \&\#1711;\&\#1604;\&\#1585;\&\#1606;\&\#1711; \&\#1575;\&\#1605;\&\#1585;\&\#1608;\&\#1586;\&\#1607; \&\#1583;\&\#1585; \&\#1605;\&\#1589;\&\#1575;\&\#1585;\&\#1601; \&\#1594;\&\#1584;\&\#1575;\&\#1610;\&\#1610; \&\#1548; \&\#1587;\&\#1575;\&\#1604;\&\#1575;\&\#1583; \&\#1608; \&\#1603;\&\#1585;\&\#1607; \&\#1605;\&\#1575;\&\#1585;\&\#1711;\&\#1575;\&\#1585;\&\#1610;\&\#1606; \&\#1583;\&\#1585; \&\#1588;\&\#1605;\&\#1575;\&\#1604; \&\#1570;\&\#1605;\&\#1585;\&\#1610;\&\#1603;\&\#1575; \&\#1603;\&\#1575;\&\#1585;\&\#1576;\&\#1585;\&\#1583; \&\#1583;\&\#1575;\&\#1585;\&\#1583;. \&\#1575;\&\#1610;\&\#1606; \&\#1711;\&\#1610;\&\#1575;\&\#1607; \&\#1576;\&\#1575; \&\#1583;\&\#1575;\&\#1585;\&\#1575; \&\#1576;\&\#1608;\&\#1583;\&\#1606; \&\#1576;\&\#1610;\&\#1588; \&\#1575;\&\#1586; 90 \&\#1583;\&\#1585;\&\#1589;\&\#1583; \&\#1575;\&\#1587;\&\#1610;\&\#1583; \&\#1607;\&\#1575;\&\#1610; \&\#1670;\&\#1585;\&\#1576; \&\#1594;\&\#1610;\&\#1585; \&\#1575;\&\#1588;\&\#1576;\&\#1575;\&\#1593; \&\#1576;\&\#1607; \&\#1582;\&\#1589;\&\#1608;\&\#1589; \&\#1575;\&\#1587;\&\#1610;\&\#1583; \&\#1604;\&\#1610;\&\#1606;\&\#1608;\&\#1604;\&\#1574;\&\#1610;\&\#1603;(70 \&\#1583;\&\#1585;\&\#1589;\&\#1583;) \&\#1608; \&\#1575;\&\#1587;\&\#1610;\&\#1583; \&\#1575;\&\#1608;\&\#1604;\&\#1574;\&\#1610;\&\#1603;(20 \&\#1583;\&\#1585;\&\#1589;\&\#1583;) \&\#1576;\&\#1575;\&\#1593;\&\#1579; \&\#1580;\&\#1604;\&\#1608;\&\#1711;\&\#1610;\&\#1585;\&\#1610; \&\#1575;\&\#1586; \&\#1711;\&\#1585;\&\#1601;\&\#1578;\&\#1711;\&\#1610; \&\#1587;\&\#1585;\&\#1582;\&\#1585;\&\#1711; \&\#1607;\&\#1575; \&\#1605;\&\#1610; \&\#1711;\&\#1585;\&\#1583;\&\#1583;.\&\#1585;\&\#1608;\&\#1594;\&\#1606; \&\#1711;\&\#1604;\&\#1585;\&\#1606;\&\#1711; \&\#1576;\&\#1607; \&\#1593;\&\#1606;\&\#1608;\&\#1575;\&\#1606; \&\#1610;\&\#1603; \&\#1585;\&\#1608;\&\#1594;\&\#1606; \&\#1586;\&\#1608;\&\#1583; \&\#1582;\&\#1588;\&\#1603; \&\#1588;\&\#1608;\&\#1606;\&\#1583;\&\#1607; \&\#1583;\&\#1585; \&\#1578;\&\#1607;\&\#1610;\&\#1607; \&\#1585;\&\#1608;\&\#1594;\&\#1606; \&\#1580;\&\#1604;\&\#1575; \&\#1603;\&\#1575;\&\#1585;\&\#1576;\&\#1585;\&\#1583; \&\#1583;\&\#1575;\&\#1585;\&\#1583;.\&\#1575;\&\#1605;\&\#1585;\&\#1608;\&\#1586;\&\#1607; \&\#1587;\&\#1593;\&\#1610; \&\#1583;\&\#1585; \&\#1578;\&\#1607;\&\#1610;\&\#1607; \&\#1608;\&\#1575;\&\#1585;\&\#1610;\&\#1578;\&\#1607; \&\#1607;\&\#1575;\&\#1610; \&\#1711;\&\#1604;\&\#1585;\&\#1606;\&\#1711; \&\#1576;\&\#1575; \&\#1583;\&\#1585;\&\#1589;\&\#1583;  \&\#1575;\&\#1587;\&\#1610;\&\#1583; \&\#1604;\&\#1610;\&\#1606;\&\#1608;\&\#1604;\&\#1574;\&\#1610;\&\#1603; \&\#1576;\&\#1575;\&\#1604;\&\#1575; \&\#1580;\&\#1607;\&\#1578; \&\#1575;\&\#1587;\&\#1578;\&\#1601;\&\#1575;\&\#1583;\&\#1607; \&\#1583;\&\#1585; \&\#1605;\&\#1589;\&\#1575;\&\#1585;\&\#1601; \&\#1570;\&\#1588;\&\#1662;\&\#1586;\&\#1610; \&\#1605;\&\#1610; \&\#1606;\&\#1605;\&\#1575;\&\#1610;\&\#1606;\&\#1583;.( 13   )



\&\#1603;\&\#1604;\&\#1610;\&\#1606;\&\#1711;\&\#1575;\&\#1578;\&\#1606; (1993) \&\#1576;\&\#1610;\&\#1575;\&\#1606; \&\#1605;\&\#1610; \&\#1603;\&\#1606;\&\#1583; \&\#1603;\&\#1607; \&\#1585;\&\#1608;\&\#1594;\&\#1606; \&\#1711;\&\#1604;\&\#1585;\&\#1606;\&\#1711; \&\#1580;\&\#1607;\&\#1578; \&\#1607;\&\#1610;\&\#1583;\&\#1585;\&\#1608;\&\#1688;\&\#1606;\&\#1607; \&\#1588;\&\#1583;\&\#1606; \&\#1608; \&\#1578;\&\#1608;\&\#1604;\&\#1610;\&\#1583; \&\#1603;\&\#1585;\&\#1607; \&\#1548;\&\#1576;\&\#1587;\&\#1610;\&\#1575;\&\#1585; 



\&\#1585;\&\#1608;\&\#1594;\&\#1606; \&\#1711;\&\#1604;\&\#1585;\&\#1606;\&\#1711; \&\#1575;\&\#1605;\&\#1585;\&\#1608;\&\#1586;\&\#1607; \&\#1583;\&\#1585; \&\#1605;\&\#1589;\&\#1575;\&\#1585;\&\#1601; \&\#1594;\&\#1584;\&\#1575;\&\#1610;\&\#1610; \&\#1548; \&\#1587;\&\#1575;\&\#1604;\&\#1575;\&\#1583; \&\#1608; \&\#1603;\&\#1585;\&\#1607; \&\#1605;\&\#1575;\&\#1585;\&\#1711;\&\#1575;\&\#1585;\&\#1610;\&\#1606; \&\#1583;\&\#1585; \&\#1588;\&\#1605;\&\#1575;\&\#1604; \&\#1570;\&\#1605;\&\#1585;\&\#1610;\&\#1603;\&\#1575; \&\#1603;\&\#1575;\&\#1585;\&\#1576;\&\#1585;\&\#1583; \&\#1583;\&\#1575;\&\#1585;\&\#1583;. \&\#1575;\&\#1610;\&\#1606; \&\#1711;\&\#1610;\&\#1575;\&\#1607; \&\#1576;\&\#1575; \&\#1583;\&\#1575;\&\#1585;\&\#1575; \&\#1576;\&\#1608;\&\#1583;\&\#1606; \&\#1576;\&\#1610;\&\#1588; \&\#1575;\&\#1586; 90 \&\#1583;\&\#1585;\&\#1589;\&\#1583; \&\#1575;\&\#1587;\&\#1610;\&\#1583; \&\#1607;\&\#1575;\&\#1610; \&\#1670;\&\#1585;\&\#1576; \&\#1594;\&\#1610;\&\#1585; \&\#1575;\&\#1588;\&\#1576;\&\#1575;\&\#1593; \&\#1576;\&\#1607; \&\#1582;\&\#1589;\&\#1608;\&\#1589; \&\#1575;\&\#1587;\&\#1610;\&\#1583; \&\#1604;\&\#1610;\&\#1606;\&\#1608;\&\#1604;\&\#1574;\&\#1610;\&\#1603;(70 \&\#1583;\&\#1585;\&\#1589;\&\#1583;) \&\#1608; \&\#1575;\&\#1587;\&\#1610;\&\#1583; \&\#1575;\&\#1608;\&\#1604;\&\#1574;\&\#1610;\&\#1603;(20 \&\#1583;\&\#1585;\&\#1589;\&\#1583;) \&\#1576;\&\#1575;\&\#1593;\&\#1579; \&\#1580;\&\#1604;\&\#1608;\&\#1711;\&\#1610;\&\#1585;\&\#1610; \&\#1575;\&\#1586; \&\#1711;\&\#1585;\&\#1601;\&\#1578;\&\#1711;\&\#1610; \&\#1587;\&\#1585;\&\#1582;\&\#1585;\&\#1711; \&\#1607;\&\#1575; \&\#1605;\&\#1610; \&\#1711;\&\#1585;\&\#1583;\&\#1583;.\&\#1585;\&\#1608;\&\#1594;\&\#1606; \&\#1711;\&\#1604;\&\#1585;\&\#1606;\&\#1711; \&\#1576;\&\#1607; \&\#1593;\&\#1606;\&\#1608;\&\#1575;\&\#1606; \&\#1610;\&\#1603; \&\#1585;\&\#1608;\&\#1594;\&\#1606; \&\#1586;\&\#1608;\&\#1583; \&\#1582;\&\#1588;\&\#1603; \&\#1588;\&\#1608;\&\#1606;\&\#1583;\&\#1607; \&\#1583;\&\#1585; \&\#1578;\&\#1607;\&\#1610;\&\#1607; \&\#1585;\&\#1608;\&\#1594;\&\#1606; \&\#1580;\&\#1604;\&\#1575; \&\#1603;\&\#1575;\&\#1585;\&\#1576;\&\#1585;\&\#1583; \&\#1583;\&\#1575;\&\#1585;\&\#1583;.\&\#1575;\&\#1605;\&\#1585;\&\#1608;\&\#1586;\&\#1607; \&\#1587;\&\#1593;\&\#1610; \&\#1583;\&\#1585; \&\#1578;\&\#1607;\&\#1610;\&\#1607; \&\#1608;\&\#1575;\&\#1585;\&\#1610;\&\#1578;\&\#1607; \&\#1607;\&\#1575;\&\#1610; \&\#1711;\&\#1604;\&\#1585;\&\#1606;\&\#1711; \&\#1576;\&\#1575; \&\#1583;\&\#1585;\&\#1589;\&\#1583;  \&\#1575;\&\#1587;\&\#1610;\&\#1583; \&\#1604;\&\#1610;\&\#1606;\&\#1608;\&\#1604;\&\#1574;\&\#1610;\&\#1603; \&\#1576;\&\#1575;\&\#1604;\&\#1575; \&\#1580;\&\#1607;\&\#1578; \&\#1575;\&\#1587;\&\#1578;\&\#1601;\&\#1575;\&\#1583;\&\#1607; \&\#1583;\&\#1585; \&\#1605;\&\#1589;\&\#1575;\&\#1585;\&\#1601; \&\#1570;\&\#1588;\&\#1662;\&\#1586;\&\#1610; \&\#1605;\&\#1610; \&\#1606;\&\#1605;\&\#1575;\&\#1610;\&\#1606;\&\#1583;.( 13   )



\&\#1603;\&\#1604;\&\#1610;\&\#1606;\&\#1711;\&\#1575;\&\#1578;\&\#1606; (1993) \&\#1576;\&\#1610;\&\#1575;\&\#1606; \&\#1605;\&\#1610; \&\#1603;\&\#1606;\&\#1583; \&\#1603;\&\#1607; \&\#1585;\&\#1608;\&\#1594;\&\#1606; \&\#1711;\&\#1604;\&\#1585;\&\#1606;\&\#1711; \&\#1580;\&\#1607;\&\#1578; \&\#1607;\&\#1610;\&\#1583;\&\#1585;\&\#1608;\&\#1688;\&\#1606;\&\#1607; \&\#1588;\&\#1583;\&\#1606; \&\#1608; \&\#1578;\&\#1608;\&\#1604;\&\#1610;\&\#1583; \&\#1603;\&\#1585;\&\#1607; \&\#1548;\&\#1576;\&\#1587;\&\#1610;\&\#1575;\&\#1585; 



\&\#1585;\&\#1608;\&\#1594;\&\#1606; \&\#1711;\&\#1604;\&\#1585;\&\#1606;\&\#1711; \&\#1575;\&\#1605;\&\#1585;\&\#1608;\&\#1586;\&\#1607; \&\#1583;\&\#1585; \&\#1605;\&\#1589;\&\#1575;\&\#1585;\&\#1601; \&\#1594;\&\#1584;\&\#1575;\&\#1610;\&\#1610; \&\#1548; \&\#1587;\&\#1575;\&\#1604;\&\#1575;\&\#1583; \&\#1608; \&\#1603;\&\#1585;\&\#1607; \&\#1605;\&\#1575;\&\#1585;\&\#1711;\&\#1575;\&\#1585;\&\#1610;\&\#1606; \&\#1583;\&\#1585; \&\#1588;\&\#1605;\&\#1575;\&\#1604; \&\#1570;\&\#1605;\&\#1585;\&\#1610;\&\#1603;\&\#1575; \&\#1603;\&\#1575;\&\#1585;\&\#1576;\&\#1585;\&\#1583; \&\#1583;\&\#1575;\&\#1585;\&\#1583;. \&\#1575;\&\#1610;\&\#1606; \&\#1711;\&\#1610;\&\#1575;\&\#1607; \&\#1576;\&\#1575; \&\#1583;\&\#1575;\&\#1585;\&\#1575; \&\#1576;\&\#1608;\&\#1583;\&\#1606; \&\#1576;\&\#1610;\&\#1588; \&\#1575;\&\#1586; 90 \&\#1583;\&\#1585;\&\#1589;\&\#1583; \&\#1575;\&\#1587;\&\#1610;\&\#1583; \&\#1607;\&\#1575;\&\#1610; \&\#1670;\&\#1585;\&\#1576; \&\#1594;\&\#1610;\&\#1585; \&\#1575;\&\#1588;\&\#1576;\&\#1575;\&\#1593; \&\#1576;\&\#1607; \&\#1582;\&\#1589;\&\#1608;\&\#1589; \&\#1575;\&\#1587;\&\#1610;\&\#1583; \&\#1604;\&\#1610;\&\#1606;\&\#1608;\&\#1604;\&\#1574;\&\#1610;\&\#1603;(70 \&\#1583;\&\#1585;\&\#1589;\&\#1583;) \&\#1608; \&\#1575;\&\#1587;\&\#1610;\&\#1583; \&\#1575;\&\#1608;\&\#1604;\&\#1574;\&\#1610;\&\#1603;(20 \&\#1583;\&\#1585;\&\#1589;\&\#1583;) \&\#1576;\&\#1575;\&\#1593;\&\#1579; \&\#1580;\&\#1604;\&\#1608;\&\#1711;\&\#1610;\&\#1585;\&\#1610; \&\#1575;\&\#1586; \&\#1711;\&\#1585;\&\#1601;\&\#1578;\&\#1711;\&\#1610; \&\#1587;\&\#1585;\&\#1582;\&\#1585;\&\#1711; \&\#1607;\&\#1575; \&\#1605;\&\#1610; \&\#1711;\&\#1585;\&\#1583;\&\#1583;.\&\#1585;\&\#1608;\&\#1594;\&\#1606; \&\#1711;\&\#1604;\&\#1585;\&\#1606;\&\#1711; \&\#1576;\&\#1607; \&\#1593;\&\#1606;\&\#1608;\&\#1575;\&\#1606; \&\#1610;\&\#1603; \&\#1585;\&\#1608;\&\#1594;\&\#1606; \&\#1586;\&\#1608;\&\#1583; \&\#1582;\&\#1588;\&\#1603; \&\#1588;\&\#1608;\&\#1606;\&\#1583;\&\#1607; \&\#1583;\&\#1585; \&\#1578;\&\#1607;\&\#1610;\&\#1607; \&\#1585;\&\#1608;\&\#1594;\&\#1606; \&\#1580;\&\#1604;\&\#1575; \&\#1603;\&\#1575;\&\#1585;\&\#1576;\&\#1585;\&\#1583; \&\#1583;\&\#1575;\&\#1585;\&\#1583;.\&\#1575;\&\#1605;\&\#1585;\&\#1608;\&\#1586;\&\#1607; \&\#1587;\&\#1593;\&\#1610; \&\#1583;\&\#1585; \&\#1578;\&\#1607;\&\#1610;\&\#1607; \&\#1608;\&\#1575;\&\#1585;\&\#1610;\&\#1578;\&\#1607; \&\#1607;\&\#1575;\&\#1610; \&\#1711;\&\#1604;\&\#1585;\&\#1606;\&\#1711; \&\#1576;\&\#1575; \&\#1583;\&\#1585;\&\#1589;\&\#1583;  \&\#1575;\&\#1587;\&\#1610;\&\#1583; \&\#1604;\&\#1610;\&\#1606;\&\#1608;\&\#1604;\&\#1574;\&\#1610;\&\#1603; \&\#1576;\&\#1575;\&\#1604;\&\#1575; \&\#1580;\&\#1607;\&\#1578; \&\#1575;\&\#1587;\&\#1578;\&\#1601;\&\#1575;\&\#1583;\&\#1607; \&\#1583;\&\#1585; \&\#1605;\&\#1589;\&\#1575;\&\#1585;\&\#1601; \&\#1570;\&\#1588;\&\#1662;\&\#1586;\&\#1610; \&\#1605;\&\#1610; \&\#1606;\&\#1605;\&\#1575;\&\#1610;\&\#1606;\&\#1583;.( 13   )



\&\#1603;\&\#1604;\&\#1610;\&\#1606;\&\#1711;\&\#1575;\&\#1578;\&\#1606; (1993) \&\#1576;\&\#1610;\&\#1575;\&\#1606; \&\#1605;\&\#1610; \&\#1603;\&\#1606;\&\#1583; \&\#1603;\&\#1607; \&\#1585;\&\#1608;\&\#1594;\&\#1606; \&\#1711;\&\#1604;\&\#1585;\&\#1606;\&\#1711; \&\#1580;\&\#1607;\&\#1578; \&\#1607;\&\#1610;\&\#1583;\&\#1585;\&\#1608;\&\#1688;\&\#1606;\&\#1607; \&\#1588;\&\#1583;\&\#1606; \&\#1608; \&\#1578;\&\#1608;\&\#1604;\&\#1610;\&\#1583; \&\#1603;\&\#1585;\&\#1607; \&\#1548;\&\#1576;\&\#1587;\&\#1610;\&\#1575;\&\#1585; 



}

\vspace{0.5cm}
\end{abstract}
\end{center}
\noindent \textbf{Keywords:} \&\#1605;\&\#1601;\&\#1610;\&\#1583; \&\#1608; \&\#1575;\&\#1586; \&\#1662;\&\#1575;\&\#1610;\&\#1583;\&\#1575;\&\#1585;\&\#1610; \&\#1576;\&\#1575;\&\#1604;\&\#1575;\&\#1610;\&\#1610; \&\#1576;\&\#1585;\&\#1582;\&\#1608;\&\#1585;\&\#1583;\&\#1575;\&\#158
\index[key]{\&\#1605;\&\#1601;\&\#1610;\&\#1583; \&\#1608; \&\#1575;\&\#1586; \&\#1662;\&\#1575;\&\#1610;\&\#1583;\&\#1575;\&\#1585;\&\#1610; \&\#1576;\&\#1575;\&\#1604;\&\#1575;\&\#1610;\&\#1610; \&\#1576;\&\#1585;\&\#1582;\&\#1608;\&\#1585;\&\#1583;\&\#1575;\&\#158}
\end{document}