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Water Practice & Technology © IWA Publishing 2007 |
doi10.2166/wpt.2007.060
Agriculture and Groundwater Protection - a Common Effort to Tackle the Nitrate Problem in Northern Bavaria, Germany
Bettina Haas1, Heiko Lukas2, Axel Bauer3
1Bayerisches Landesamt für Umwelt, Referat 91, Hans-Högn-Str. 12, D-95030 Hof
2Amt für Landwirtschaft und Forsten Würzburg, Sachgebiet Agrarökologie und Boden (2.1A), von-Luxburg-Str. 4, D-97074 Würzburg
3Regierung von Unterfranken, Sachgebiet 52 - Wasserwirtschaft, Peterplatz 9, D-97070 Würzburg
ABSTRACT
Due to low groundwater recharge rates and intensive agricultural land use, elevated nitrate concentrations in groundwater are measured in Lower Franconia, Bavaria (Germany). Analysis of cultivation practice in this region showed that crops with high nitrogen-surplus were cultivated to a significant extent. By the example of a catchment area where drinking water is extracted, an approach for a change in agricultural land use was tested. Fields were classified according to soil quality and the type of sub-soil. Measures like conversion of arable land into grassland or changes in type of crop that is grown, were adjusted to the local (field) conditions. Thus nitrogen surplus could be reduced to half by the extensification of one third of the agricultural land. Due to the classification system, the measures are realised in the most cost-effective way as well.
Keywords: Agriculture, extensification, groundwater protection, nitrate, rehabilitation of groundwater quality
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