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Fig. 3 | Environmental Sciences Europe

Fig. 3

From: Spring waters as an indicator of nitrate and pesticide pollution of rural watercourses from nonpoint sources: results of repeated monitoring campaigns since the early 2000s in the low mountain landscape of Saarland, Germany

Fig. 3

Nitrate content of springs outside agricultural influence (farmland < 1%); median of 12 monthly measurements (dark blue = 2002; light blue = 2011–12; red = 2018; dotted line = target value 14.2 mg/L; short gray lines = median of 3 periods; gray line = median of all values)

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