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    Biochar and gypsum amendment of agroindustrial waste for enhanced black soldier fly larval biomass and quality frass fertilizer

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    Authors
    Beesigamukama, D.
    Mochoge, B.
    Korir, N.K.
    Fiaboe, K.K.
    Nakimbugwe, D.
    Khamis, F.M.
    Dubois, T.
    Subramanian, S.
    Wangu, M.M.
    Ekesi, S.
    Tanga, C.M.
    Date
    2021
    Language
    en
    Type
    Journal Article
    Review status
    Peer Review
    ISI journal
    Accessibility
    Open Access
    Usage rights
    CC-BY-4.0
    Metadata
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    Citation
    Beesigamukama, D., Mochoge, B., Korir, N.K., Fiaboe, K.K., Nakimbugwe, D., Khamis, F.M., ... & Tanga, C.M. (2020). Biochar and gypsum amendment of agro-industrial waste for enhanced black soldier fly larval biomass and quality frass fertilizer. PloS One, 15(8), e0238154, 1-25.
    Permanent link to cite or share this item: https://hdl.handle.net/10568/111330
    DOI: https://doi.org/10.1371/journal.pone.0238154
    Abstract/Description
    Black soldier fly (BSF) (Hermetia illucens L.) is one of the most efficient bio-waste recyclers. Although, waste substrate amendments with biochar or gypsum during composting process are known to enhance nutrient retention, their impact on agro-industrial waste have not been documented. Hence, this study focuses on a comparative effect of agro-industrial waste amended with biochar and gypsum on BSF larval performance, waste degradation, and nitrogen (N) and potassium retention in frass fertilizer. Brewery spent grain was amended with biochar or gypsum at 0, 5, 10, 15 and 20% to determine the most effective rates of inclusion. Amending feedstock with 20% biochar significantly increased wet (89%) and dried (86%) larval yields than the control (unamended feedstock). However, amendment with 15% gypsum caused decrease in wet (34%) and dried (30%) larval yields but conserved the highest amount of N in frass. Furthermore, the inclusion of 20% biochar recorded the highest frass fertilizer yield and gave a 21% increase in N retention in frass fertilizer, while biomass conversion rate was increased by 195% compared to the control. Feedstock amendment with 5% biochar had the highest waste degradation efficiency. Potassium content in frass fertilizer was also significantly enhanced with biochar amendment. At maturity, frass compost with more than 10% inclusion rate of biochar had the highest cabbage seed germination indices (>100%). The findings of this study revealed that initial composting of biochar amended feedstocks using BSF larvae can significantly shorten compost maturity time to 5 weeks with enhanced nutrient recycling compared to the conventional composting methods.
    CGIAR Author ORCID iDs
    Komi Fiaboehttps://orcid.org/0000-0001-5113-2159
    Notes
    Open Access Journal; Published online: 27 Aug 2020
    Other CGIAR Affiliations
    Agriculture for Nutrition and Health
    AGROVOC Keywords
    hermetia illucens; composting; nutrients; soil parent material; wastes; fertilizers
    Subjects
    AGRONOMY; INTEGRATED SOIL FERTILITY MANAGEMENT; SOIL FERTILITY; SOIL HEALTH
    Countries
    Kenya
    Regions
    Africa; Eastern Africa
    Organizations Affiliated to the Authors
    International Centre of Insect Physiology and Ecology; Kenyatta University; Busitema University; International Institute of Tropical Agriculture; Makerere University
    Investors/sponsors
    International Development Research Centre; Australian Centre for International Agricultural Research; Ministry of Foreign Affairs, the Netherlands; Department for International Development, United Kingdom; Swedish International Development Cooperation Agency; Swiss Agency for Development and Cooperation; Federal Ministry for Economic Cooperation and Development, Germany; Government of Ethiopia; Government of Kenya
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