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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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    Journal Article (3.238Mb)
    Date
    2021
    Author
    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.
    Type
    Journal Article
    Review Status
    Peer Review
    Target Audience
    Scientists
    Metadata
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    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.
    https://dx.doi.org/10.1371/journal.pone.0238154
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/7039
    IITA Authors ORCID
    Komi Fiaboehttps://orcid.org/0000-0001-5113-2159
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1371/journal.pone.0238154
    Research Themes
    Natural Resource Management
    IITA Subjects
    Agronomy; Integrated Soil Fertility Management; Soil Fertility; Soil Health
    Agrovoc Terms
    Hermetia Illucens; Composting; Nutrients; Soil Parent Material; Wastes; Fertilizers
    Regions
    Africa; East Africa
    Countries
    Kenya
    Hubs
    Central Africa Hub
    Journals
    PLOS ONE
    Collections
    • Journal and Journal Articles4835
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