Agriculture produce commodities and but also influence the environment. However, even if the value of commodities is easy to determine, it is difficult to assess the efficiency of agricultural production at site level. Furthermore, the valuation of environmental impact is complex. Non-parametric approaches such as DEA allow for an assessment of environment and economic performance. We implement a plot-specific approach combining GIS and DEA models. This allows a spatially explicit assessment of agricultural land use for different subjects such as ecology and economy. In a second stage DEA-model, the impact of farm- and site-specific characteristics on efficiency is analysed.