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== Fertilising ==
Fertilising is fundamental to keep the soil fertile. In the past, animal manure was commonly used for that purpose<ref name="ftn3">The production of manure in the barns was discussed in an earlier volume of the Ethnographic Atlas, the one on ''Livestock Farming and Shepherding in the Basque Country''. Bilbao: Etniker Euskalerria; Eusko Jaurlaritza; Government of Navarra, pp. 230-233.</ref>. Down through the decades, mineral and synthetic fertilisers grew in importance and their use became widespread and has only recently been limited by their cost.
== Use of ash ==