http://inspire.ec.europa.eu/codelist/SoilDerivedObjectParameterNameValue/nitrogenContentINSPIRE Registry teamJRC-INSPIRE-SUPPORT@ec.europa.euhttp://inspire.ec.europa.eu/registry2015-08-18 17:37 PM CEST2015-08-18 17:37 PM CESTnitrogen contentTotal nitrogen content in the soil, including both the organic and inorganic forms.NOTE 1 Nitrogen is one of the most important plant nutrients and forms some of the most mobile compounds in the soil-crop system, and as such, is commonly related to water-quality problems. Total N includes both organic and inorganic forms. SOURCE Soil survey laboratory methods manual version 4.0. Soil Survey Investigations Report No. 42. USDA, USA. NOTE 2 The nitrogen content is a parameter to be taken into account for meeting the (i) Council Directive 91/676/EEC of 12 December 1991 concerning the protection of waters against pollution caused by nitrates form agricultural sources