\documentclass[english,german]{scrartcl}
\usepackage[latin1]{inputenc}
\usepackage{geometry}
\geometry{verbose,a4paper,tmargin=1.75cm,bmargin=2cm,lmargin=2cm,rmargin=2cm,headheight=0.8cm,headsep=0.5cm,footskip=0.5cm}
\usepackage{babel}
\usepackage{url}
\urlstyle{same}
\newcommand\email{\begingroup \urlstyle{same}\Url}\usepackage{graphicx}
\usepackage{units}
\usepackage{tabularx}
\usepackage{wasysym} % enable use of \permil instead of \textperthousand
\usepackage{marvosym}
\usepackage{arabtex}
\usepackage{hyphenat}
\usepackage{booktabs}
\usepackage{mdwlist}
\renewcommand{\thefootnote}{\relax}
\usepackage{index}
\newindex{key}{kdx}{knd}{Keywords}
\newindex{author}{idx}{ind}{Authors}
\usepackage{fancyhdr}
\pagestyle{fancy}
\renewcommand{\headrulewidth}{0pt}
\fancyfoot{}
\usepackage{ifpdf}
\ifpdf
%\usepackage[activate]{pdfcprot}
%\usepackage[owner=Tapioka, print=true, copy=true, edit=false, annotate=false,set]{pdfcrypt}
%encryption: not supported any more (since pdftex 1.10)
\usepackage[pdftex]{thumbpdf}
\usepackage[pdftex]{hyperref}
\hypersetup{pdftitle={Evaluation of Growth Indices of Hemp (\textit{Cannabis sativa}) and Sesame (\textit{Sesamum indicum}) in Intercropping with Replacement and Additive Series},pdfauthor={Alireza Koocheki, Mehdi Nassiri Mahallati, Surur Khorramdel, Sepideh Anvarkhah, Mozhgan Sabet Teimouri, Sara Sanjani, Javad Shabahang},pdfsubject={Tropentag 2010: Abstract},pdfkeywords={Additive series, hemp, intercropping, replacement series, sesame},pdfpagemode=None,colorlinks=true}
\else
\usepackage{ae}
\usepackage{textcomp}
\fi
\begin{document}
\ifpdf
\parbox[b]{2.5cm}{\resizebox*{2.5cm}{!}{\includegraphics{dtt2010.jpg}}}
\else
\parbox[b]{2.5cm}{\resizebox*{2.5cm}{!}{\includegraphics{dtt2010.eps}}}
\fi
\hfill
\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{Evaluation of Growth Indices of Hemp (\textit{Cannabis sativa}) and Sesame (\textit{Sesamum indicum}) in Intercropping with Replacement and Additive Series\footnote{\textbf{Contact Address:} Surur Khorramdel, Ferdowsi University of Mashhad, College of Agriculture, Department of Agronomy, Azadi Sq., 91775-1163~Mashhad, Iran, \mbox{e-mail}: \email{su_khorramdel@yahoo.com}}\\[0.8ex]}}
\normalsize{\textsc{Alireza Koocheki, Mehdi Nassiri Mahallati, Surur Khorramdel, Sepideh Anvarkhah, Mozhgan Sabet Teimouri, Sara Sanjani, Javad Shabahang}}
\end{center}
\begin{itemize*}
\item[]{\small{\textit{Ferdowsi University of Mashhad, College of Agriculture, Department of Agronomy, Iran}}}
\end{itemize*}
\index[author]{Koocheki, Alireza}
\index[author]{Nassiri Mahallati, Mehdi}
\index[author]{Khorramdel, Surur}
\index[author]{Anvarkhah, Sepideh}
\index[author]{Sabet Teimouri, Mozhgan}
\index[author]{Sanjani, Sara}
\index[author]{Shabahang, Javad}
\begin{center}
\vspace{1.1cm}
\textbf{Abstract}
\begin{abstract}
\normalsize{
Intercropping is known as a practice, which can improve the utilisation of available resources and cause yield advantages and increased yield stability compared to sole cropping. In order to evaluate the effect of intercropping with replacement and additive series for hemp (\textit{Cannabis sativa}.) and sesame (\textit{Sesamum indicum}), a field experiment was conducted during growing season 2006--2007 at the Agricultural Research Station of Ferdowsi University of Mashhad, Iran. For purpose, a randomised complete block design with three replications was used. Treatments included different combinations of intercropping with replacement (\mbox{75\,\%} sesame+ \mbox{25\,\%} hemp, \mbox{25\,\%} sesame+ \mbox{75\,\%} hemp, \mbox{50\,\%} sesame+ \mbox{50\,\%} hemp) and additive (\mbox{50\,\%} sesame+ \mbox{100\,\%} hemp and \mbox{100\,\%} sesame+ \mbox{50\,\%} hemp) series and their monoculture. Results indicated that  the highest and the lowest leaf area index (LAI) of hemp were observed in monoculture (2.99) and \mbox{25\,\%} sesame+ \mbox{75\,\%} hemp (1.06) at 85 days after emergence, respectively. The maximum and the minimum lowest dry matter (DM) accumulation of hemp were obtained in \mbox{25\,\%} sesame+ \mbox{75\,\%} hemp (1921.7 gm$^{-2}$) and monoculture( 929.9 gm$^{-2}$) and  at 94 days after emergence, respectively. The highest and the lowest LAI and DM accumulation of sesame were observed in monoculture (1.34 and 551.27 gm$^{-2}$) and \mbox{25\,\%} sesame+ \mbox{75\,\%} hemp (0.23 and 51.73 gm$^{-2}$), respectively. The maximum and the minimum crop growth rate (CGR) were observed in monoculture (22.78 gm$^{-2}$day$^{-1}$) and 50\%sesame+ \mbox{100\,\%} hemp (0.09 gm$^{-2}$day$^{-1}$) at 85 days after emergence, respectively. It seems that the intercropped sesame with hemp reduced the growth indices of sesame due to increasing shading on it and decreasing the absorption of radiation.}

\vspace{0.5cm}
\end{abstract}
\end{center}
\noindent \textbf{Keywords:} Additive series, hemp, intercropping, replacement series, sesame
\index[key]{Additive series}
\index[key]{Hemp}
\index[key]{Intercropping}
\index[key]{Replacement series}
\index[key]{Sesame}
\end{document}