\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={The Effect of Pre"=Crop Duration from Subsoil Layer to the Following Growth of Spring Wheat},pdfauthor={Idri Hastuty Siregar,  Jonharnas, Andriko Noto Susanto},pdfsubject={Tropentag 2016: Abstract},pdfkeywords={Biological nitrogen fixation, chicory, crop rotation, lucerne},pdfpagemode=None,colorlinks=true}
\else
\usepackage{ae}
\usepackage{textcomp}
\fi
\begin{document}
\ifpdf
\parbox[b]{2.5cm}{\resizebox*{2.5cm}{!}{\includegraphics{dtt2016.jpg}}}
\else
\parbox[b]{2.5cm}{\resizebox*{2.5cm}{!}{\includegraphics{dtt2016.eps}}}
\fi
\hfill
\parbox[b]{13.4cm}{\centering \large{\textbf{Tropentag, September 18-21, 2016, Vienna, Austria}}\\[1ex] \Large{``Solidarity in a competing world ---\\fair use of resources''\\[2ex]}}
\hspace{0.1cm}
\begin{center}
\Large{\textbf{The Effect of Pre"=Crop Duration from Subsoil Layer to the Following Growth of Spring Wheat\footnote{\textbf{Contact Address:} Idri Hastuty Siregar, University of Bonn, Institute for Organic Agriculture, Sternenburgstr 10, 53115~Bonn, Germany, \mbox{e-mail}: \email{hastuty_idri@yahoo.com}}\\[0.8ex]}}
\normalsize{\textsc{Idri Hastuty Siregar$^{1}$,  Jonharnas$^{1}$, Andriko Noto Susanto$^{2}$}}
\end{center}
\begin{itemize*}
\item[]{\small{\textit{$^{1}$University of Bonn, Institute for Organic Agriculture, Germany}}}
\item[]{\small{\textit{$^{2}$Indonesian Ministry for Agriculture, Assesment Institute for Agricultural Technology, }}}
\end{itemize*}
\index[author]{Siregar, Idri Hastuty}
\index[author]{Jonharnas, }
\index[author]{Susanto, Andriko Noto}
\begin{center}
\vspace{1.1cm}
\textbf{Abstract}
\begin{abstract}
\normalsize{
A pot experiment to investigate the previous crops effect of Lucerne (\textit{Medicago sativa} L.) and Chicory (\textit{Cichorium intybus} L.) to the following growth of spring wheat at subsoil layer has been established in greenhouse located at Wiesengut, Hennef - Germany. Subsoil layer from a depth of 41--\mbox{75\,cm} was excavated to the greenhouse to be used to grow spring wheat. The treatment was also combined with 5 level of N mineral fertiliser. Total number of pots were 80 consisted of 4 (four) subsoil previously grown with pre"=crops (Lu1y, Lu3y, Chi1y, Chi3y)  $\times$ 5 (five) level of N mineral fertiliser (0, 40, 80, 120 and \mbox{160\,kg} ha$^{-1}$) $\times$ 4 (four) replicates. The result showed that the longer pre"=crop duration (Lu3y, Chi3y) had more prominent effect to the performance growth of spring wheat. The total biomass, plant height, shoot weight, and N uptake of spring wheat after pre"=crops Lu3y and Chi3y were higher than of spring wheat grown after pre"=crops Lu1y and Chi1y for almost N mineral fertiliser level . The higher accumulation of soil organic matter in longer pre"=crop duration attributed to this result. Lucerne as leguminous crop did now show prominent effect to enhance the performance of spring wheat. This was presumably due to unfavourable soil condition for Biological Nitrogen Fixation (BNF) process in the subsoil layer resulting low microbial activity in the nodules of Lucerne. However, further research to investigate the factors that influence microbial activity such as \textit{Rhizobium} bacteria in subsoil layer need to be carried out.}

\vspace{0.5cm}
\end{abstract}
\end{center}
\noindent \textbf{Keywords:} Biological nitrogen fixation, chicory, crop rotation, lucerne
\index[key]{Biological nitrogen fixation}
\index[key]{Chicory}
\index[key]{Crop!rotation}
\index[key]{Lucerne}
\end{document}
