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Environmental Sciences Europe
Fig. 2 | Environmental Sciences Europe

Fig. 2

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. 2

Nitrate content of 22 springs influenced by agriculture (median and standard deviation of 12 monthly measurements) and average of all forest springs; comparison of three measurement periods (dark blue = 2002; light blue = 201120–12; red = 2018; dotted line = target value 14.2 mg/L; dotted line = Nitrate Directive threshold 50 mg/L)

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