A pot experiment was set up to test the effect of urban sewage sludge application on the "total" Ca, P, Fe, Al, Ni and Se fractions, estimated after digestion with cc. HNO 3 + cc. H 2O 2, and the NH 4-acetate + EDTA-soluble fractions of these elements in four experimental soils (acidic and calcareous sand, and acidic and calcareous clay). Soil analytical data were compared with the Ca, P, Fe, Al, Ni and Se contents in the grain and straw yield of the test plant, spring barley, to demonstrate the accumulation of these elements in the soil-plant system. For each soil, the application levels tested were 0, 2.5, 5, 10 and 20 g sludge/kg soil/year (amounting to 0, 7.5, 15, 30 and 50 g/kg soil over a period of 3 years) in terms of air-dry matter. The highest (20 g) rate was equivalent to ploughing in 60 t/ha air-dry material, representing a mass ratio of approx. 2%. The total number of pots (10-litre plastic buckets with perforated bottoms) was 80 (5 sludge treatments × 4 soils × 4 replications).
|Translated title of the contribution||Study on the effect of urban sewage sludge application in a pot experiment. III.|
|Number of pages||14|
|Journal||Agrokemia es Talajtan|
|Publication status||Published - Dec 1 2008|
ASJC Scopus subject areas
- Agronomy and Crop Science
- Soil Science