Short-Term Effect of Biochar on Microbial Biomass, Respiration and Enzymatic Activities in Wastewater Irrigated Soils in Urban Agroecosystems of the West African Savannah

TitleShort-Term Effect of Biochar on Microbial Biomass, Respiration and Enzymatic Activities in Wastewater Irrigated Soils in Urban Agroecosystems of the West African Savannah
Publication TypeJournal Article
Year of Publication2021
AuthorsAsirifi I., Werner S., Heinze S., Saba C.KS, Lawson I.YD, Marschner B.
JournalAgronomy-BaselAgronomy-Basel
Volume11
Pagination15
Date PublishedFeb
Type of ArticleArticle
Accession NumberWOS:000621965800001
KeywordsAgriculture, biochar, Fertilization, microbial activities, Plant Sciences, urban agriculture, wastewater
Abstract

Irrigated urban agriculture (UA) supports the economy and health of urban inhabitants in low-income countries. This system is often characterized by high nutrient inputs and mostly utilizes wastewater for irrigation. Biochar has been proposed to increase crop yields and improve soil properties. In this study, we assessed the transient effect of rice husk biochar (20 t ha(-1)) and/or fertilizer (NPK: 15-15-15) on microbial respiration, microbial biomass carbon and enzyme activities of irrigated (wastewater and tap water) soil from an UA field experiment in the Guinea savannah zones of Ghana. Our results showed an increase by up to 123% in soil organic carbon (SOC) after a year of biochar application, while hot water extractable carbon (HWEC) was increased by only 11 to 26% and microbial biomass carbon (MBC) by 34%. Basal respiration was significantly increased in mineral fertilized soil by up to 46% but decreased by 12-45% under wastewater irrigation. Overall, the metabolic quotient (qCO(2)) indicated less stress for the microbial community and increased carbon use efficiency with biochar application and wastewater irrigation. Total enzymes activity was increased under wastewater irrigation and biochar treated soils exhibit a more diverse composition of C-cycling enzymes and a higher activity of aminopeptidases. Biochar and wastewater showed positive effects on biological soil properties and contributed to soil fertility. Our results suggest beneficial effects of biochar on non-biochar SOC stocks in the long term.

Short TitleAgronomy-BaselAgronomy-Basel
Alternate JournalAgronomy-Basel
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Cited Reference Count: 65
Asirifi, Isaac Werner, Steffen Heinze, Stefanie Saba, Courage K. S. Lawson, Innocent Y. D. Marschner, Bernd
German Federal Ministry of Education and Research (BMBF)Federal Ministry of Education & Research (BMBF); German Federal Ministry for Economic Cooperation and Development (BMZ) under the GlobE initiative [FKZ: 031A242-A, FKZ: 031A242-B]
The research was funded by German Federal Ministry of Education and Research (BMBF) and the German Federal Ministry for Economic Cooperation and Development (BMZ) under the GlobE initiative (FKZ: 031A242-A,B).

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Asirifi, I (corresponding author), Ruhr Univ Bochum, Inst Geog, Soil Sci & Soil Ecol, Univ Str 150, D-44801 Bochum, Germany.
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