Farm livestock slurries - a short review of the situation in Portugal

Abstract

Many environmental problems associated with the livestock production in Portugal are identified in terms of the load of organic material and nutrients. Their effect has been reflected in the variable quality of ground and surface water and, to some extent, in the soil characteristics. Several approaches to livestock management have been adopted and practised in the last few years as a result of the implementation of both specific and general environmental legislation. However, the existing legislation on pig slurry standards for discharge in water bodies, for example, is unrealistic when compared to the river water quality requirements. Research, which has been undertaken recently on pollution prevention due to livestock farming indicates that the most sustainable option for the majority of Portuguese livestock farms is the application of both slurry and manure onto land. A more detailed assessment on a local/farm basis is needed in order to confirm this potential.