Composted sewage sludge: container experiments with Norway spruce (Picea abies) and Austrian pine (Pinus nigra var. austriaca)

Krapfenbauer, A.; Sieghardt, M.; Buchleitner, E.

Centrablatt fur das Gesamte Forstwesen 96(3): 162-174


Accession: 000845290

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Two-yr-old P. abies and P. nigra seedlings were grown for 9 months on 6 substrates: (a) siliceous soil; (b) calcareous soil; (c) siliceous soil mixed with 20% composted sewage sludge (CSS); (d) calcareous soil with 20% CSS; (e) pure CSS; and (f) shredded logging slash mixed with 33% CSS. The av. contents of N, P, K, Ca, Mg and Na in needles, stems and roots were higher for both species grown in (c), (d) and (e) than in (a), (b) and (f). The NaCl content of the applied CSS was relatively low, but caused injury to the needles of treated plants at the beginning of the growing season. Because the Cu, Zn, Pb and Cd contents of the CSS were above the commonly tolerated range, the use of CSS is not recommended (except in special cases) in either agriculture or forestry without further research on the long-term effects of heavy metals.