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Book of Abstracts <strong>First</strong> <strong>Legume</strong> <strong>Society</strong> <strong>Conference</strong> 2013: A <strong>Legume</strong> Odyssey Novi Sad, Serbia, 9-11 May 2013<br />

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Are durum wheat-grain legume and sunflower-soybean intercropping efficient solutions<br />

to produce legume in low input systems?<br />

Laurent Bedoussac 1,2 , Etienne-Pascal Journet 2,3 , Hélène Tribouillois 2,4 , Grégory Vericel 2,4 , David<br />

Champclou 2,4 , Nathalie Lande 5 , Eric Justes 2,4<br />

1 ENFA, Castanet-Tolosan, France<br />

2 INRA, UMR1248 AGIR, Castanet-Tolosan, France<br />

3 CNRS, UMR2594 LIPM, Castanet-Tolosan, France<br />

4 Université Toulouse, INPT, UMR AGIR, Toulouse, France<br />

5 CETIOM, F-78850 Thiverval Grignon, France<br />

Intercropping (IC) - growing simultaneously two or more species in the same field - could<br />

increase resources use efficiency by interspecific complementarity due to species differences in<br />

aerial and root system architecture, in growth dynamics and to legume N 2 fixation. The main<br />

objective was to analyse the dynamic functioning of durum wheat-grain legume (pea or faba<br />

bean) winter IC and sunflower-soybean summer IC in order to evaluate their potential<br />

advantages for global yield, grain quality and N acquisition depending upon cultivars, species and<br />

sowing patterns. Experiments have been carried out in SW France : i) durum wheat-grain legume<br />

IC at INRA Toulouse since 2005 using a wide range of IC combinations (varieties and N<br />

treatments) and ii) sunflower-soybean IC at CETIOM and INRA in 2010-2011 with cultivars<br />

showing various precocities and differing row patterns. Our work demonstrates that IC is<br />

particularly suited to low N input systems (no or low amounts of N fertilizer) due to the<br />

complementary use of N sources for both winter and summer intercrops. Cereal-grain legumes<br />

IC grain yield was higher than the SC mean value and wheat grain protein content was improved.<br />

For sunflower-soybean IC, 2 rows of the earlier sunflower combined with 4 rows of the later<br />

soybean was the more efficient pattern. IC is also efficient to produce legume, which is<br />

sometimes difficult in SC. However, before optimising these systems, further research is still<br />

needed to analyse the effects of precocity, aerial architecture, row structure and N management.<br />

238

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