Whilst objectivist epistemologies have been dominant in productivist agriculture, the local, cultural and environmental contexts of sustainable agriculture are more fully informed by constructivist epistemologies. Within constructivism, tacit knowledge -an intuitive knowledge that cannot be formalised -is explored empirically. Six types of tacit knowledge were identified as a result of working closely with a sustainable food network: the Brighton and Hove Food Partnership. Customs cohere around integrating food with other sustainable activity; developing a complex unregulated organisation requires savoirfaire. The unique character of Brighton has developed an operational folklore, and network identity is important, particularly in relation to conventional agriculture and to the city as a whole. A confidence in people's roles has helped define network development and using different discourses, communicating the network in diverse contexts, is important for understanding the network. All these tacit knowledge elements have a strong influence over the network but have to be assimilated knowledge rather than learned.
Environmental policies in agriculture have now been fully incorporated into policy throughout Europe both within and outside of the European Union. One of the cornerstones to the successful implementation of these policies is both the willingness and ability of farmers to implement them. Many actors in uence both the formulation and implementation of such policies, from governments, through pressure groups and the agricultural knowledge networks (AKNs) in various countries, to farmers themselves. In assessing the principal objectives of all of these actors, it can be seen that none has environmental goals as their principal objective, and the development of policies is thus both dif cult and a residual priority. This situation is likely to be ameliorated not through a focus on more effective policy instruments for agri-environmental polices, but through adjustments of administrative structures for both their development and in carrying them out.
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