(fig 2), for two years with contrasting rainfall. The relationships between yield components, observed in the wet year and for high levels of nitrogen supply had similar patterns compared with those established for wheat grown in temperate regions (table I). However, the values of fitted parameters (table III) were appreciably different. In "Tell" soil, the maximum levels of all yield components were reached during the wet year for nitrogen fertilization as low as 60 kg ha -1 , applied at tillering and beginning of the stem elongation; in "Hamri" soil, the maximum levels could not be reached, even for a total nitrogen amount of 100 kg ha -1 ; yield components had very low levels during the dry year in the two soils, with no appreciable effect of fertilization (
Résumé Notre recherche s’intéresse à la naissance de la fonction ‘risk manager’. Nous proposons de montrer pourquoi et comment émerge et se construit cette fonction dans les grandes entreprises industrielles françaises. Dresser l’histoire récente de la gestion des risques nous permet de dater et expliquer la création de la fonction, d’identifier les acteurs de l’émergence et de mettre en perspective les évolutions à venir.
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