『Abstract
　Mediterranean Spain is a region with intensive agricultural production combined with an important seasonal water demand for water supply. High application rates of inorganic nitrogen fertiliser, input of plant protection products and intensive irrigation, sometimes with treated wastewater, is a common practice. As a result, most aquifers show nitrate contamination problems of agricultural origin. Data on pesticide residues is scarce, as systematic monitoring is not currently done. In Majorca Island, values up to 700 mg/l of nitrate in groundwater have been observed. To analyse the current situation derived from non-point pollution, several actions have been taken at different scales: declaration of a nitrate vulnerable zone, field experiments to evaluate nitrogen transport to the aquifer and the development of a GIS-simulation model to generate nitrate risk maps.

Keywords: Groundwater; Vadose zone; Nitrate pollution; Majorca』

Introduction
Groundwater and agriculture in Mediterranean Spain
The Majorca island case study
　Geological setting
　Hydrogeological context
Non-point pollution of groundwater: research on nitrate sources and evaluation
　The Sa Pobla sub-basin
　Nitrate leaching research using experimental plots
　Results from experimental plot
　Risk evaluation of nitrate leaching using GIS and coupled models
Conclusion
Acknowledgments
References