Composting is both for the 1996 separately in Austria collected biological "waste" as well as for the increasing and of sludge quantities, a central and appropriate re possibility dar. In this regard, urges again and again to the extent on agricultural by this compost heavy metals and trace elements soils are applied and how they accumulate in soil and the plants and thus in food and feed. In Styria, to a grassland experiment, with 4 year term (1994-1998) and an arable crop rotation experiment with six-membered (term applied since 1996). Exemplarily chosen for the experiments some of heavy metals (lead, cadmium, mercury) and trace elements (arsenic, chromium, copper, nickel, molybdenum, selenium, zinc), which at regular intervals over the bottom and were also analyzed in plant parts / are. In this work, differences in base budgets and levels in plant parts at different fertilization are (unfertilized, bio-compost, manure compost, mineral fertilizer, granules of bio-compost and sewage sludge) identified and compared.