This article is concerned with the process of agriculture's economic normalisation in nineteenth-century France. The manuals published for rural inhabitants and for use in primary schools between the July Monarchy and the end of the Second Empire are taken here as a means of analysing a process of economic rationalisation underway during this period, in particular as it would affect the peasantry. Drawing attention to the content of agricultural manuals-with a specific focus on those awarded prizes within a competition for agriculturalmanual writing announced in 1837-this article sheds light on the educational forms in which economic precepts and accounting techniques were presented and the manner in which those techniques were employed to promote 'best practices', thus orienting and rationalising farm management and the farmer's decisions. It highlights the social work of ideological production and behavioural guidance that unfolded in the first part of the nineteenth century. It stresses the ethic embodied in these agricultural manuals, one directed toward a greater rationality of economic behaviour on the part of the small and medium-scale peasantry in tandem with an idea of disciplined and prudent personal and professional conduct.