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\hypersetup{pdftitle={Water Use and Yield of Wheat Genotypes as Affected by Water and N-supply},pdfauthor={Helmut Herzog, Marco Grabe, Klaus-Peter Goetz},pdfsubject={Tropentag 2010: Abstract},pdfkeywords={Drought adaptation, N-side-dressing, spring wheat genotypes, water use efficiency},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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\begin{center}
\Large{\textbf{Water Use and Yield of Wheat Genotypes as Affected by Water and N-supply\footnote{\textbf{Contact Address:} Helmut Herzog, Humboldt-Universität zu Berlin, Department of Crop Science in the Tropics and Subtropics, Albrecht-Thaer-Weg 5, 14195~Berlin, Germany, \mbox{e-mail}: \email{helmut.herzog@agrar.hu-berlin.de}}\\[0.8ex]}}
\normalsize{\textsc{Helmut Herzog, Marco Grabe, Klaus-Peter Goetz}}
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\begin{itemize*}
\item[]{\small{\textit{Humboldt-Universität zu Berlin, Department of Crop Science in the Tropics and Subtropics, Germany}}}
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\index[author]{Herzog, Helmut}
\index[author]{Grabe, Marco}
\index[author]{Goetz, Klaus-Peter}
\begin{center}
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\textbf{Abstract}
\begin{abstract}
\normalsize{
Water resources are a constraint in agriculture not only in semiarid, but also in subhumid climates. Hence, we investigated water use of 4 wheat genotypes from mediterranean (cvs. Golia \& Gönen) and temperate climate (cvs. Monsun \& Taifun) and their response to water deficit after heading and to late N-application.







All plants were raised in pots under a rain shelter from April to August 2007 receiving the same optimum"=treatment apart from late N-application  before heading (N: approx. 30 vs. \mbox{60\,kg} ha$^{-1}$) and water supply during 3 weeks after heading (W: soil moisture was either maintained at field capacity  or was lowered and  kept at half of available FC by deficit irrigation).







VA3 of the 3-factorial experiment (cvs\,$\times$\,N\,$\times$\,W, n = 5) revealed many significant interactions, particularly of water supply with late N-application and genotypes. High compared to low N-doses increased biomass, grain yield, protein content of grains, water use efficiency (WUE) and evapotranspiration efficiency (ETE) at well"=watered conditions, but failed to do so at deficit irrigation. Grain yield and WUE of well"=watered plants declined from Monsun over Taifun and Golia to Gönen with significant differences between each of the genotypes; and deficit irrigation reduced yield in 3 genotypes, but not in Taifun. WUE was improved by deficit irrigation in Taifun, but lowered in Gönen and did not respond in the other 2 genotypes.







There were several interactions cvs\,$\times$\,N\,$\times$\,W; \textit{e.g.}: high N-Dosis induced yield inreases in well"=watered plants and low ones under deficit irrigation in 3 geno"=types, whereas  Golia did not respond to high dosis, irrespective of water supply.







It is concluded that increasing the late N-application, which favours yield protein content and WUE under well"=watered conditions, is less or not effective under deficit irrigation   after heading. The 2 genotypes from mediterranean climate (Golia and Gönen) produced less biomass and yield than those from temperate climate (Monsun and Taifun) and displayed a similar or even higher yield reduction under deficit irrigation; since their WUE, ETE and HI was also lower, they appeared even less adapted to lack of water after heading.



}

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\noindent \textbf{Keywords:} Drought adaptation, N-side"=dressing, spring wheat genotypes, water use efficiency
\index[key]{Drought adaptation}
\index[key]{N-side"=dressing}
\index[key]{Spring wheat genotypes}
\index[key]{Water!use efficiency}
\end{document}