Fig. 2. Variations of Cu and Zn concentrations in runoff from 11 field sites in 2001. The term n refers to the number of water samples. Standard deviations are placed above each bar.
Fig. 2. Variations of Cu and Zn concentrations in runoff from 11 field sites in 2001. The term n refers to the number of water samples. Standard deviations are placed above each bar.