Effects of Domestic Sewage Sludge, Conifer Bark Ash and Wood Fibre Waste onSoil Characteristics and the Growth of Salix aquatica

1988

24 S.

6 Abb., 12 Tab., 42 Lit. Ang.

Bandaufführung

9767

The experiments were established at Haeaedetjaervi, in the Parkano Research Area of the Finnish Forest Research Institute, in 1981 and 1982. The limestone sludge caused marked alterations in the chemical, microbiological and physical properties of the soil and changes in the water balance, which were otherwise beneficial except that the low concentration of potassium andhigh concentration of iron in the sludge evidently restricted the growth of th e willows. Total soil nitrogen, soil ammonium, nitrate, soil soluble phosphorusand N and P concentration in the leaves and bark of the willows increased due to the limestonde sludge application. Denitrification was at a high level in the limestone sludge treated soil. This sludge enhanced also cellulose decomposition activity in soil during the first growing season. The effects of the chemically treated sludge in soil were marginal due to the low amount applied. Conifer bark ash raised the soil pH and Ca content and soil P, K and Mg concentration. The ash raised the P and K content in the leaves and bark of the willows also. Wood fibre waste was found to be unsuitable for rapidly growing willows.