The aim of this article is to measure the advance of agricultural productivity in South Navarra between 1780 and 1900. The construction of several indices of agricultural commodities and factor prices allows us to apply the methodology of Total Factor Productivity (TFP). As distinguished from the thesis of stagnation, our estimate of the annual rate of TFP growth in the long run is close to 0.42 %. This rate was particularly high between 1817 and 1850, in a context of deflation and institutional change. During the second half of the century the cyclical evolution of the curve reveals the obstacles derived from the capital resources supply, especially fertilizers and animal traction.