Oilseeds & fats Crops and Lipids OCLAbstract -Very early sowing: an agronomic strategy to improve soybean performance in France ? This study was carried out on very early sowing of soybean in order to improve potential yield and/or reduce water requirements. Three varieties belonging to different maturity groups were selected to identify varietal traits of interest in very early sowing. A set of multi-location irrigated trials consisting in two sowing dates was performed from 2010 to 2014. Yield and water requirements were determined; crop development and growth was monitored on cv. Santana. The combined effects of low temperatures and photoperiod in very early sowing resulted in limited aboveground biomass production during vegetative period and increased grain filling duration. Maximal values for yield were observed in very early sowing modality, although yield was slightly lower in very early sowing compared to conventional one (3.7 t/ha vs. 3.9 t/ha).
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