\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={Response of a Traditional Sweetpotato (\textit{Ipomoea batatas} [L]) Variety to Fertilisation in Leyte, Philippines},pdfauthor={Luz Asio, Nemesio Tamayo, Nenita Dela Cruz},pdfsubject={Tropentag 2018: Abstract},pdfkeywords={Fertilisation, Philippines, sweetpotato, traditional variety, tropical rootcrops  },pdfpagemode=None,colorlinks=true}
\else
\usepackage{ae}
\usepackage{textcomp}
\fi
\begin{document}
\ifpdf
\parbox[b]{2.5cm}{\resizebox*{2.5cm}{!}{\includegraphics{dtt2018.jpg}}}
\else
\parbox[b]{2.5cm}{\resizebox*{2.5cm}{!}{\includegraphics{dtt2018.eps}}}
\fi
\hfill
\parbox[b]{13.4cm}{\centering \large{\textbf{Tropentag, September 17-19, 2018, Ghent}}\\[1ex] \Large{``Global food security and food safety:\\The role of universities''\\[2ex]}}
\hspace{0.1cm}
\begin{center}
\Large{\textbf{Response of a Traditional Sweetpotato (\textit{Ipomoea batatas} [L]) Variety to Fertilisation in Leyte, Philippines\footnote{\textbf{Contact Address:} Luz Asio, Visayas State University, Dept. of Agronomy, College of Agriculture and Food Science, 6521~Baybay City, Philippines, \mbox{e-mail}: \email{luz.asio@vsu.edu.ph}}\\[0.8ex]}}
\normalsize{\textsc{Luz Asio$^{1}$, Nemesio Tamayo$^{2}$, Nenita Dela Cruz$^{3}$}}
\end{center}
\begin{itemize*}
\item[]{\small{\textit{$^{1}$Visayas State University, Dept. of Agronomy, Philippines}}}
\item[]{\small{\textit{$^{2}$Central Luzon State University, Dept. of Crop Science, Philippines}}}
\item[]{\small{\textit{$^{3}$Central Luzon State University, Dept. of Soil Science, Philippines}}}
\end{itemize*}
\index[author]{Asio, Luz}
\index[author]{Tamayo, Nemesio}
\index[author]{Dela Cruz, Nenita}
\begin{center}
\vspace{1.1cm}
\textbf{Abstract}
\begin{abstract}
\normalsize{
In the Philippines, very few agronomic studies have been done on traditional sweetpotato varieties despite the fact that these are very popular by local consumers. This study evaluated the response of a traditional variety (var. Siete Flores) to NPK fertilisation. Three separate N, P and K fertilisation experiments were laid out arranged in RCBD with 3 replications. The N experiment had 7 levels: 0 (no N), 40, 80, 120, 160, 200, \mbox{240\,kg} ha$^{-1}$ N while there were 6 levels for the P experiment: 0 (no P), 20, 40, 60, 80, \mbox{120\,kg} ha$^{-1}$ P$_{2}$O$_{5}$ and 9 levels for the K experiment: 0 (no K), 30, 60, 90, 120, 160, 200, 240, \mbox{280\,kg} ha$^{-1}$ K$_{2}$O. Results revealed that application of different rates of N, P$_{2}$O$_{5}$ and K$_{2}$O significantly increased the dry matter yield, weight of marketable and non"=marketable roots, and total root yield. Regardless of fertilisation, the traditional variety had low harvest index of $<$ \mbox{20\,\%} (0.20) indicating its low yielding characteristic. The study found that \mbox{30\,\%} of the maximum yield of the crop was supplied by the inherent soil N, \mbox{50\,\%} by the inherent soil P and \mbox{60\,\%} by the inherent soil K. It proved that inherent soil fertility considerably affects the yield of sweetpotato thus, use of blanket fertiliser recommendations as is currently practised in the Philippines, could result in either under or over fertilisation. Optimum rates of NPK application for the soil used were 118, 38 and \mbox{90\,kg} ha$^{-1}$ of N, P$_{2}$O$_{5}$ and K$_{2}$O. NPK fertilisation did not significantly influence the nutritional quality of sweet potato (crude protein, total carbohydrates and crude fiber). Average crude fiber was \mbox{20\,\%} indicating that this variety can be promoted as a health food.}

\vspace{0.5cm}
\end{abstract}
\end{center}
\noindent \textbf{Keywords:} Fertilisation, Philippines, sweetpotato, traditional variety, tropical \linebreak{rootcrops}
\index[key]{Fertilization}
\index[key]{Philippines}
\index[key]{Sweetpotato}
\index[key]{Traditional variety}
\index[key]{Tropical rootcrops}
\end{document}
