Contaminant sources and types contributing with nitrogen and phosphorus to stream Table A2 – water in the Umia River basin. Literature references: (a) Ryding and Rast (1992); (b) Directiva 200/660/CE (2008); (c) and (d) Reports of Galicia municipalities (BNAE, 2008). The yields relative to contaminant source and type are the mean values of all other “Agriculture” “Other” contaminant types of the same source. Contaminant type Literature Contaminant source Nitrogen yield Phosphorus yield reference (yield unit) Domestic sewage (a) (kg.capita–1.y–1) 4.75 0.73 Human activities Leachates from animal excreta (b) Livestock production (kg.head–1.y–1) Cattle 65.11 32.91 Sheep 6.47 0.96 Goat 8.71 1.29 Pig 9.37 2.7 28.02 30.02 Poultry 0.69 0.21 Leachates from farmland fertilizers (c) Agriculture (kg.ha–1.y–1) Cereal 9.02 25.51 Fodder 62.60 92.90 Pataca 63.36 32.26 Leguminous 5.33 -6.67 Horticultural 49.87 12.26 Fruit tree –48.28 –55.11 Chestnut tree 0.00 0.00 Vineyard –16.86 –72.40 Grazing 33.98 43.58 Other 17.7 8.0 Runoff from areas with < 10% occupation by (d) agriculture plus urban area (kg.ha–1.y–1)
Table A2 – Contaminant sources and types contributing with nitrogen and phosphorus to stream water in the Umia River basin. Literature references: (a) Ryding and Rast (1992); (b) Directiva 200/660/CE (2008); (c) and (d) Reports of Galicia municipalities (BNAE, 2008). The yields relative to contaminant source “Agriculture” and type “Other” are the mean values of all other contaminant types of the same source. Contaminant source Contaminant type Nitrogen yield Phosphorus yield Literature reference (yield unit) Domestic sewage (a) (kg.capita–1.y–1) Human activities 4.75 0.73 Livestock production Leachates from animal excreta (b) (kg.head–1.y–1) Cattle 65.11 32.91 Sheep 6.47 0.96 Goat 8.71 1.29 Pig 9.37 2.7 28.02 30.02 Poultry 0.69 0.21 Agriculture Leachates from farmland fertilizers (c) (kg.ha–1.y–1) Cereal 9.02 25.51 Fodder 62.60 92.90 Pataca 63.36 32.26 Leguminous 5.33 -6.67 Horticultural 49.87 12.26 Fruit tree –48.28 –55.11 Chestnut tree 0.00 0.00 Vineyard –16.86 –72.40 Grazing 33.98 43.58 Other 17.7 8.0 Runoff from areas with < 10% occupation by agriculture plus urban area (d) (kg.ha–1.y–1)
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