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\hypersetup{pdftitle={Impact of Super Absorbent Polymer on Yield and Growth Analysis of Corn (\textit{Zea mays} L.) under Different Irrigations Intervals and Water Requirements},pdfauthor={Shapour Kouhestani, Naser Askari Rabori, Mahdieh Amirinejad},pdfsubject={Tropentag 2010: Abstract},pdfkeywords={Corn Yield, drought stress, Irrigation intervals, Super absorbent hydro gel, Water requirements},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{Impact of Super Absorbent Polymer on Yield and Growth Analysis of Corn (\textit{Zea mays} L.) under Different Irrigations Intervals and Water Requirements\footnote{\textbf{Contact Address:} Mahdieh Amirinejad, University of Tehran, College of Aburaihan, 20th km of Imam Reza Blvd, Tehran, Iran, \mbox{e-mail}: \email{mahdiehamiri@ut.ac.ir}}\\[0.8ex]}}
\normalsize{\textsc{Shapour Kouhestani$^{1}$, Naser Askari Rabori$^{2}$, Mahdieh Amirinejad$^{3}$}}
\end{center}
\begin{itemize*}
\item[]{\small{\textit{$^{1}$Jiroft University, Plant Horticulture, }}}
\item[]{\small{\textit{$^{2}$Jiroft University, Plant Horticulture, }}}
\item[]{\small{\textit{$^{3}$University of Tehran, College of Aburaihan, Iran}}}
\end{itemize*}
\index[author]{Kouhestani, Shapour}
\index[author]{Askari Rabori, Naser}
\index[author]{Amirinejad, Mahdieh}
\begin{center}
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\textbf{Abstract}
\begin{abstract}
\normalsize{
Drought stress as one of the most important environmental stress plays an effective role in reducing crop yield all around the world. In order to investigate the effects of super absorbent hydro gels on drought stress condition, an experiment was carried out during the spring and summer seasons of 2007 at the Agriculture Engineering Research Farm of Jiroft University. The experiment was split plot based on completely randomised block design (RCB) with three replications. Drought stress was applied to the main plots at three levels, irrigation of \mbox{100\,\%} of crops water requirement (no stress), \mbox{75\,\%} (mild stress) and \mbox{50\,\%} (severe stress) and super absorbent levels were applied to the sup"=plots at three levels (0, 200 and \mbox{300\,kg} ha$^{-1}$). Corn cultivar SC. 704 was used. The tested superabsorbent polymer was A200. For best control of irrigation, drip irrigation with volume controller and class A. pan was used .Drought stress reduced grain yield, yield components and biological yield. Yield reduction was higher at \mbox{50\,\%} crop water requirement. On the contrary, super absorbent hydro gels particularly at \mbox{300\,kg} ha$^{-1}$ diminished the detrimental effects of water stress on yield. Application of super absorbents caused higher number of rows per ear only under drought stress condition. Mean while, grain yield, biological yield, grain weight and number of grains per row were under both stress and non"=stress conditions. It was concluded that application of super absorbent hydro gels can increase yield and yield components through increasing soil water holding capability for a long time.}

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\noindent \textbf{Keywords:} Corn Yield, drought stress, Irrigation intervals, Super absorbent hydro gel, Water requirements
\index[key]{Corn Yield}
\index[key]{Drought stress}
\index[key]{Irrigation intervals}
\index[key]{Super absorbent hydro gel}
\index[key]{Water!requirements}
\end{document}