In the present paper an application of Spanish farmland portfolio management is been carried out. The farmland returns are composed of two effects, the land appreciation effect and the cash-flow effect. The study is performed for crops and regions. The most certain of financial concepts is that risk and return are related. Systematic differences in returns must relate to differences in risk. The returns and risk for every crop and region have been calculated. From Sharpe's model, the Beta index has been estimated for every crop and region and the efficient Spanish farm land portfolio has been built.