This project aims to develop an expert system for precision irrigation scheduling (OpIRIS) using the results obtained in previous Framework Programme (FP) projects on water and fertiliser productivity in fruit trees and hydroponic crops in greenhouses. In countries with scarce water resources and where irrigation requires more than 70% of water, competition for this resource is intensifying and will continue to do so as long as water demand increases and water quality decreases. In 2012, the EU report on the potential for water savings in EU countries noted that improving water efficiency would save 15-60% (BIO Smart Service, 2012).