Effets des contraintes mécaniques du sol sur la limitation des rendements du tournesol

TL;DRAbstract

The sunflower production takes place throughout complex interactions between the genotype, the crop management and the environment. Sunflower rooting depth is strongly related with soil structural behavior and gravimetric water availability. Soil compaction represents an important issue in the actual context of agricultural system durability, and is characterized by a decrease of soil available water, an increase of bulk density and soil resistance to the penetration. Variation of root system exploration and their consequences on above ground growth and development under soil mechanical constraints have been explored for many crops (Maize Zea mays, Wheat Triticum durum, or Soybean Glycine max), but only few researches have been carried out on sunflower (Helianthus annuus L.). Among them only few includes kinetic aspects and less quality of production. The aim of this work is to study i) the root system modifications caused by soil compaction, ii) the above ground system alteration caus

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