This article concerns the study of the agricultural policy of the Belgian State in the period of 1844-1845. Behind the technical formulations of diverse and even contradictory laws and regulations, the interest is to reveal the political and economical interests and strategies of the main political actors. This period is at the end of the well-known belgian "Unionism" that means the alliance of the dominant farces, catholics and liberals. The study shows that this period is not exempt of conflicts between those farces, with behind them respectively agricultural and industrial interests, with a more predominant wheight of the latters than the usual theory of modernization usually had assessed.