Opportunity Brief Black Solider Fly Agriculture Waste to frass to fertiliser

This briefing by GreenCape explores the potential of using Black Soldier Fly (BSF) larvae to convert organic waste into frass, a nutrient-rich excrement that can be processed into organic fertilisers and bio-stimulants for regenerative horticulture in South Africa.

• Black Soldier Fly (BSF) larvae can be used to upcycle organic waste into high-value products, specifically frass, which is a mixture of "larvae faeces, exoskeleton sheds, and remaining undigested feed substrate".
• Frass offers several advantages over synthetic fertilisers, including the presence of chitin, which can "stimulate growth of beneficial bacteria and mycorrhizal fungi" and "supressing plant pathogens". It also contains humic acid, which increases the cation exchange capacity (CEC) of soils to reduce nutrient leaching and improve micronutrient uptake.
• South Africa's reliance on synthetic fertilisers presents a supply chain risk; in 2021, the country imported approximately 2.6 million tonnes of fertiliser, with R17 billion of the R24 billion total import value coming from only five countries: Saudi Arabia, Russia, Qatar, Oman, and China.
• There is significant potential for frass production from South Africa's food waste. Of the ~22.8 million tonnes of food produced or imported in 2021, ~10.3 million tonnes were wasted. Using a conversion rate of 20-30%, this could yield between 2.1 and 3.1 million tonnes of wet frass annually, with an optimistic value potential of R3.1 to R12.4 billion per year.
• The primary market opportunity for frass is providing organic waste producers and handlers with a "landfill alternative disposal solution". The most promising feedstock sources are in the production stage of the value chain, particularly within the eight metropolitan areas of South Africa, due to the presence of large, consistent waste streams.
• Several barriers hinder the growth of the frass market, including the difficulty for BSF farmers to scale operations to meet large-farmer demand and significant regulatory delays. The Department of Agriculture Land Reform and Rural Development (DALRRD) has turnaround times for product registration "in excess of 18 months".
• Fertilisers in South Africa are regulated under the Fertilisers, Farm Feeds, Agricultural Remedies and Stock Remedies Act (Act 36 of 1947). Products are registered in three groups: Group 1 (≥100g/kg NPK), Group 2 (<100g/kg NPK), and Group 3 (substances that improve soil condition). Frass marketed only for NPK typically falls under Group 2, while those claiming bio-stimulant benefits require the more "onerous" Group 3 certification.
• Industry insights suggest that frass producers should develop dry products to prevent rot and ensure easier storage, and should engage the sector to curate nutrient profiles based on specific crop needs.

APA

GreenCape (n.d.). Opportunity Brief Black Solider Fly Agriculture Waste to frass to fertiliser. https://greencape.co.za/wp-content/uploads/2024/01/OPP-FRASS-Report-FINAL-DIGITAL.pdf

Chicago

GreenCape. Opportunity Brief Black Solider Fly Agriculture Waste to frass to fertiliser. n.d. https://greencape.co.za/wp-content/uploads/2024/01/OPP-FRASS-Report-FINAL-DIGITAL.pdf.

Wikipedia

{{cite report |author=GreenCape |title=Opportunity Brief Black Solider Fly Agriculture Waste to frass to fertiliser |url=https://greencape.co.za/wp-content/uploads/2024/01/OPP-FRASS-Report-FINAL-DIGITAL.pdf |access-date=17 August 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{greencapendopportunity, author = {{GreenCape}}, title = {{Opportunity Brief Black Solider Fly Agriculture Waste to frass to fertiliser}}, institution = {GreenCape}, url = {https://greencape.co.za/wp-content/uploads/2024/01/OPP-FRASS-Report-FINAL-DIGITAL.pdf}, urldate = {2026-08-17}, note = {Indexed by Climate Insights Directory} }