Fertilising effect of sewage sludge ash inoculated with the phosphate-solubilising fungus Penicillium bilaiae under semi-field conditions

TitleFertilising effect of sewage sludge ash inoculated with the phosphate-solubilising fungus Penicillium bilaiae under semi-field conditions
Publication TypeJournal Article
Year of Publication2019
AuthorsRaymond N.S, Jensen L.S, van der Bom F., Nicolaisen M.H, Muller-Stover D.
JournalBiology and Fertility of SoilsBiology and Fertility of SoilsBiology and Fertility of Soils
Volume55
Pagination43-51
Date PublishedJan
Type of ArticleArticle
ISBN Number0178-2762
Accession NumberWOS:000454615900005
KeywordsAgriculture, availability, BIOAVAILABILITY, biochar, Fertiliser, Fieldexperiment, functional diversity, gasification, INCUBATION, long-term fertilization, P-solubilising microorganisms, phosphorus, quality, Sewage sludge ash, soil, soil microbial communities, WASTE-WATER, wood-ash
Abstract

Sewage sludge ashes provide interesting possibilities to recycle phosphorus (P) to soil, although the immediate plant availability is often low. The objective of this work was to increase the P-fertilising effect of sewage sludge ash through inoculation with the phosphate-solubilising fungus Penicillium bilaiae. In a soil incubation study, ash amendment enhanced the content of water-extractable P, but in contrast to previous in vitro experiments, inoculation with P. bilaiae did not further increase P availability, probably due to limited competitiveness of the fungus in soil. In a micro-plot field trial, a moderate P fertiliser effect of the ash was found without any additional effect of P. bilaiae ash inoculation on plant biomass and P-uptake. However, soil microbial functions determined by the MicroResp method were not negatively affected by the ash amendment. In conclusion, inoculation with P. bilaiae did not prove to be a suitable strategy to enhance P availability from sewage sludge ash. A better insight into the fungus' ecology and colonisation ability in soil and rhizosphere as well as into its interactions with ash P is needed to further develop such alternative P-fertilising approaches.

Short TitleBiol. Fertil. SoilsBiol. Fertil. Soils
Alternate JournalBiol. Fertil. Soils