Amylolytic activity of soil degraded after sewage sludge application

Abstract

The aim of this study was to analyse the effect of dehydrated and thermally treated sewage sludge on the amylolytic activity of degraded soils. Amylase activity and amylolytic bacterial abundance in the rhizosphere of grasses were monitored twice during the growing season in June and October in the first year after sludge application. The highest number of amylolytic bacteria was observed in October from variants to which S2 was applied at a rate of 29 t DM/ha and was 44.62 x 10⁶ cfu/g DM of soil. The amylolytic activity in soil treated with S1 the highest average value has been reached in June - 2.12 mg Glc/g d.m. x∙24 h, while in soil treated with S2 it was stable during in studied period from 1.65 to 2.18 mg Glc/g d.m.∙24 h.