Table 7.4 - Main anthropogenic sources of diffuse pollution by heavy metals to agricultural land

Source: RIVM, 1992

Notes: ­ no contribution, + slight contribution, ++ moderate contribution, +++ high contribution.

1. Large differences between countries occur: copper compounds, for instance, are sometimes registered as fertiliser and sometimes as pesticide; differences also occur between and within countries in distinctions between arable land and grassland.