Source: 1. Royal Decree 1051/2022, which establishes rules for sustainable nutrition in agricultural soils 2. Decree 5/2020, which designates the Vulnerable Zones to water pollution by nitrates from agricultural and livestock sources, and approves the Code of Good Agricultural Practices 3. Regional Order of 22 November 1999, of the Minister of Agriculture, Livestock and Food, which publishes the Approval of the Code of Good Agricultural Practices of Navarre