Nutrient loads to Lake Peipsi. Environmental monitoring of Lake Peipsi/Chudskoe 1998-99. Subproject report phase 2

acid deposition azote bassin versant biological production calidad del agua carga contaminante charge polluante cours d'eau cursos de agua estonia estonie eutrophication eutrophisation fosforo lac lagos lakes losses from soil monitoring nitrogen nonpoint pollution nutrientes nutrients perte par le sol phosphore phosphorus pollutant load pollution by agriculture pollution diffuse pollution par l'agriculture production biologique rivers russian federation seasonal variation sostenibilidad substance nutritive surveillance sustainability vigilancia water quality watersheds