The aim of the study was to examine the effect of livestock production on the economic efficiency of investments in irrigation projects. The study was based on a model focused on field crop/livestock production using the data of crop yields in field crop production with or without irrigation, financial results of cattle fattening and milk production and the input and output price relationship.

The study demonstrates the methodological approach to the determination of the upper limit of land value and analyzes the influence of the mode of determination of the economic effect of land use and the level of ground waters on its amount. A model was developed based on the business results of an agricultural enterprise involved in a field crop/livestock production over the past few years, which had planned to erect a drainage system in order to manage the excess of water on the available land area.