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\hypersetup{pdftitle={Light Interception and Radiation Use Efficiency of Rapeseed under Different Row Spacing as Second Crop},pdfauthor={Hosseinzadeh Mohammad Hadi, Esfahani Masoud},pdfsubject={Tropentag 2016: Abstract},pdfkeywords={Grains Yield, Growth Indices, light Interception, Radiation Use Efficiency, Rapeseed (Brassica napus L.), Row spacing},pdfpagemode=None,colorlinks=true}
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\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]}}
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\begin{center}
\Large{\textbf{Light Interception and Radiation Use Efficiency of Rapeseed under Different Row Spacing as Second Crop\footnote{\textbf{Contact Address:} Hosseinzadeh Mohammad Hadi, Tarbiat Modares University, Dept. of Agronomy, Jalal-Al-Ahmad, 1411713116~Ttehran, Iran, \mbox{e-mail}: \email{m-hosseinzadeh@modares.ac.ir}}\\[0.8ex]}}
\normalsize{\textsc{Hosseinzadeh Mohammad Hadi$^{1}$, Esfahani Masoud$^{2}$}}
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\begin{itemize*}
\item[]{\small{\textit{$^{1}$Tarbiat Modares University, Dept. of Agronomy, Iran}}}
\item[]{\small{\textit{$^{2}$University of Guilan, Agronomy \& Plant Breeding Department, }}}
\end{itemize*}
\index[author]{Mohammad Hadi, Hosseinzadeh}
\index[author]{Masoud, Esfahani}
\begin{center}
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\textbf{Abstract}
\begin{abstract}
\normalsize{
Production of dry matter, as a function of absorbed light during crop growth period and radiation use efficiency (RUE), is a function of canopy structure. Steady distribution of plant is effective on suitable distribution of light inside the canopy, therefore, important effect of planting arrangment on producing of the product, is mainly because of difference in quality of solar energy distribution that consequently, leads to increase in light absorption and higher yield. One of the techniques for this objective, is change in row space. For this purpose, we examined the effect of row space on quantitative and qualitative assesment, Light Interception and radiation use efficiency four rapeseed (\textit{Brassica napus} L.) cultivars was investigated in a paddy fields as second crop after rice at Rice Research Institute of Iran (Rasht), during two growing seasons. The experiment was conducted as a split plot in randomised complete block design with four replications. The main plots consisted of four rapeseed cultivars: Hyola308, RGS003, PF7045/91 and Hyola401 and the subplot were three row spacing: 20, 25 and \mbox{30\,cm} at constant plant densities (\unitfrac[40]{plant}{m}2).



Results showed that PF7045/91 produced the highest grain yield (\unitfrac[2043]{kg}{ha}), oil content (\mbox{34.19\,\%}), oil yield, biologic yield, number of siliques per plant and number of first and secondry branches and plant height. The highest grain yield (\unitfrac[1777]{kg}{ha}), oil content (\mbox{33.35\,\%}), and oil yield were obtained in \mbox{20\,cm} row spacing. Results also showed that PF7045/91 ranked the first in light interception (LI\%) (\mbox{75.5\,\%}) and radiation use efficiency (RUE) (\unitfrac[2.33]{g}{MJ}) and row spacing of \mbox{20\,cm} showed the highest light interception (\mbox{68.5\,\%}). Results showed that PF7045/91 produced the highest crop growth rate (CGR) (\unitfrac[5.45]{g}{m}2.9GDD), leaf area index (LAI) (2.02) and net assimilation rate (NAR) (8/\unitfrac[31]{g}{m}2.9GDD), which were significantly higher than the rests. Row spaces of \mbox{20\,cm} ranked the first in CGR (\unitfrac[3.76]{g}{m}2.9GDD), LAI (1.94), NAR (\unitfrac[5.23]{g}{m}2.9GDD) which were significantly different with other row spaces in LAI and NAR indices.



}

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\end{abstract}
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\noindent \textbf{Keywords:} Grains Yield, Growth Indices, light Interception, Radiation Use Efficiency, Rapeseed (\textit{Brassica napus} L.), Row spacing
\index[key]{Grains Yield}
\index[key]{Growth!Indices}
\index[key]{Light Interception}
\index[key]{Radiation Use Efficiency}
\index[key]{Rapeseed (Brassica napus@\textit{Brassica napus} L.)}
\index[key]{Row spacing}
\end{document}
