The aim of this paper consists on analysing the evolution of the production of major agricultural commodities in Spain during the period 1990-2009. The main raw materials are defined by calculating the percentage of the following ratio: the value of production of each raw material to the value of total production of its agriculture sub-sector. Subsequently, the decreasing order of those values lets us consider the main raw materials as the first ones of that order for each sub-sector. Then we can examine, using multivariate statistical techniques, the relation between changes in the production of each major raw material and other variables such as the prices got by farmers, the CAP reforms and the changes in other relevant variables like the area harvested or the crop yield. The results show us that those which best explain the Value of Spanish Agricultural Production are the land variables and the price received.