Impact of management tools on nursery crop production. This paper aims to show the impact of using management tools on nursery crop production. It is based on more general research carried out in a large nursery which had introduced tools for employee performance specification and assessment, in order to "rationalise" the organisation of production. Since the cultivation of plants in pots (living, perishable products) is a series of long, unstable procedures undertaken in a dynamic environment, this analysis covers the impact the tools had on the work of employees involved in cultivation and dispatch, as well as on the sustainability of the company. Furthermore, analysis of the interviews and observations reveals that the conditions for time management are typified by uncertainties and unknown factors, whereas the deadlines constitute imperatives in a business with a significant physical component. The situation is made worse by the new specification and assessment tools, which are rigid, simplistic, and run counter to the demands of the job. They hamper the development of activities within an individual and collective dynamic, and prevent the possible emergence of actions that would coherently integrate efficiency targets. The consequences are apparent in terms of potential threats to health and safety, quality and the sustainability of the production system. KEY WORDS agriculture, management tools, risks, time management, activity development

Éditeur ARPACT-Association Recherches et Pratiques sur les ACTivités Référence électronique Valérie Zara-Meylan, « Quelles conceptions temporelles pour analyser l'activité ? Une proposition issue de recherches en ergonomie dans l'horticulture »,

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Comment faire face aux imprévus sans être pris au dépourvu ? Cette question est au cœur du métier de chef de culture que nous avons observé au cours d’interventions ergonomiques dans de petites entreprises de l’horticulture ornementale. En mettant en évidence des configurations redoutées par des chefs de culture dans leur activité, nous analysons les modalités par lesquelles ils gèrent et anticipent les risques pour leur santé et celle des ouvriers qu’ils encadrent. Cette analyse permet de comprendre que certaines contraintes qui sembleraient inévitables peuvent pourtant faire partie du champ des transformations de l’organisation du travail.

Modalidades de gestão do meio temporal em uma condução de processos múltiplos em situação dinâmica : uma pesquisa em empresas de horticultura Modalidades de gestión de la esfera temporal en la conducción de procesos múltiples en situación dinámica : una investigación en empresas hortícolas Modalités de gestion du milieu temporel dans une conduite de processus multiples en situation dynamique : une recherche dans des entreprises horticoles Management modalities of the temporal dimension in conducting multiple processes in a dynamic situation: a research at horticultural enterprises