Science you can trust, results you can see. Independent university trials confirm what regenerative growers already know — healthy soil starts with biology, not bottles.
Evidence library
Explore peer-reviewed studies and international research programs that document how BSFL frass performs in vegetables, turf, tree nurseries, and modern CEA systems — plus how diverse, sustainable feedstocks like olive waste, seaweed, and dairy byproducts are shaping the future of insect agriculture.
Peer-reviewed evidence
The library below tracks experiments that quantify yield, nitrogen efficiency, microbiome shifts, and tree-restoration outcomes — plus cutting-edge research into sustainable feedstocks and circular bioeconomy applications, and programs translating the science into practice.
These open-access papers span field cereals, greenhouse herbs, hemp, tree nurseries, and soil ecology. Click through for full methods and statistics.
Wageningen University PhD, 2023
Wantulla showed that BSF frass and exuviae only suppressed Delia radicum when they primed resident Pseudomonas communities; efficacy and larval mortality were soil-type specific yet achieved without compromising cabbage biomass.
Read dissertationbioRxiv, 2023
Green et al. found winter wheat shoots were 11% taller and heavier after frass drenches even though the material contained only trace N:P:K. Enterococcus species were traced from larval guts into the rhizosphere as the likely plant-growth trigger.
Read studyInsects (MDPI), 2021
Borkent & Hodge measured up to 25% more shoot dry weight across herbs and vegetables when 3 g/pot of BSF frass was mixed into organic media, matching chicken manure pellets but stalling at higher doses.
Read studyHeliyon, 2021
Menino et al. ran seven BSF frass rates and saw total ryegrass fresh weight climb from 42 g/pot in the control to 62 g/pot at 150 kg N ha−1, alongside higher soil P, K, and dehydrogenase activity.
Read studyJ. Insects as Food & Feed, 2022
Treating greenhouse maize with BSF frass boosted grain yield by 2–25% over NPK or brewer’s grain compost and raised net income 163% when frass was paired 50:50 with mineral N.
Read studyFrontiers in Plant Science, 2020
Beesigamukama et al. reported that 7.5 t/ha of BSF frass produced 14% more maize grain than a commercial organic fertiliser and 7% more than urea, while increasing N uptake by 76% and doubling agronomic N-use efficiency.
Read studyAgronomy (MDPI), 2020
Klammsteiner et al. showed frass matched NH4NO3 for ryegrass production, increased nitrate and dissolved N, and did not elevate coliform counts after soil incorporation.
Read studyFrontiers in Microbiology, 2022
Fuhrmann et al. tracked Rwandan grass–clover pots and saw BSF residues lift plant yield 17% and basal respiration 16% over controls while enriching Bacillus and Mortierella populations.
Read studySustainability (MDPI), 2025
Malagasy trials found half- and single-rate BSF frass doubled Dodonaea height growth and kept survival at 95%, whereas NPK cut survival to 5%; overdosing (2× rate) was lethal, underscoring the need for calibrated applications.
Read studyInsects (MDPI), 2025
Kavanagh et al. evaluated six monoecious and dioecious hemp cultivars and found low HexaFrass™ doses (3 g/pot) increased shoot growth in both male and female plants with no marginal gains at higher rates, mirroring other organic fertilisers.
Read studyBlack soldier flies don't just make great frass — they can thrive on an impressive range of organic byproducts that would otherwise go to waste. These studies show how everyday leftovers from olive mills, dairy farms, seafood processors, and coastal harvests are being turned into high-quality insect nutrition, closing the loop on waste across multiple industries.
Food Microbiology, 2020
Researchers tested seaweed as a feed ingredient for black soldier fly larvae and mapped the food-safety steps needed to make it work. When seaweed was dried at the right temperatures, harmful bacteria were eliminated — proving that ocean-harvested plants can be a safe, nutrient-rich addition to insect diets when handled correctly.
Read studyAnimal Feed Science & Technology, 2025
This study explored feeding BSF larvae with milk whey and other dairy processing leftovers — the kind of material most farms have in abundance. The larvae converted these byproducts into protein- and fat-rich biomass, suggesting that common dairy waste could fuel a new generation of sustainable insect farming.
Read studyHeliyon, 2024
Scientists evaluated a range of unconventional feed materials — including agricultural residues and food-processing byproducts — and found that BSF larvae adapted well to varied diets, producing nutrient-dense biomass and high-quality frass regardless of the starting material. That versatility is key to scaling insect farming sustainably.
Read studyWaste Management, 2024
A landmark study showed BSF larvae efficiently broke down municipal organic waste and the resulting proteins were processed into biodegradable plastic films — a real-world example of circular bioeconomy in action. The entire supply chain, from waste collection to bioplastic production, proved economically viable.
Read studyJ. Insects as Food & Feed, 2025
This paper examined the full potential of insect frass as more than just a soil amendment — highlighting its role in plant health promotion, disease suppression, and as a safe, nutrient- rich input for sustainable agriculture. The takeaway: frass is a multitool for growers, not a single-purpose product.
Read studyMajor European Union research initiatives are advancing insect agriculture on a global scale. These programs bring together dozens of universities, farms, and food companies to prove that insect-based products — from animal feed to organic fertilizers — can be produced sustainably using local waste streams.
EU Horizon / PRIMA Programme
This EU-funded project unites 25 partners across six Mediterranean countries to turn olive mill waste into valuable products. BSF larvae convert olive byproducts into protein-rich animal feed, while the remaining residues produce biogas for clean energy. The goal: a zero-waste olive industry that cuts food loss by at least 25%.
Visit OLIWA projectEU Horizon Europe Programme
Seventeen partners across ten countries are developing locally produced alternative proteins from insects, microalgae, legumes, and fermentation. By using agricultural byproducts as feed, CIPROMED aims to cut Europe's dependence on imported protein while producing food and feed with 30–50% lower greenhouse gas emissions than conventional farming.
Visit CIPROMED projectPrograms below show how BSFL frass is being commercialised in North America and Africa—from broiler feed safety to urban microgreen substrates and tree nurseries.
The big picture
These aren't just lab results — they're proof that nature-based solutions work at every scale. Here are the practical takeaways you can use today.
BSF larvae can thrive on olive mill leftovers, dairy whey, seaweed, brewery grain, and city food scraps — turning waste streams into premium frass for your garden. That closed loop means every bag you buy supports a cleaner food system.
Research shows frass doesn't just deliver nutrients — it activates soil microbes within 48 hours, suppresses root pests, boosts plant immune defenses through chitin, and even improves soil structure over time. It's a full-spectrum soil health tool.
Insect-based products generate 30–50% fewer greenhouse gas emissions than conventional protein and fertilizer sources. EU programs like OLIWA and CIPROMED are proving that local insect farming can replace imported inputs while keeping communities self-sufficient.
From seaweed drying temperatures to frass microbial safety, these studies establish clear quality standards. Proper handling eliminates pathogens, and every batch can be traced from feedstock to finished product — so you know exactly what's going into your soil.
Trial snapshots
Translate the studies above into clear agronomy talking points for crews, retailers, or funding partners.
Field maize responded best to 2.5–7.5 t/ha of frass, with the 7.5 t/ha rate adding 14% grain and +76% N uptake over urea; pairing lower rates 1:1 with mineral N kept ROI positive.
Greenhouse herbs, lettuce, and hemp all peaked when 3 g/pot (≈5% of media) of HexaFrass™ was blended into peat mixes; higher doses plateaued or suppressed growth, so keep additions light.
Malagasy reforestation nurseries doubled Dodonaea height growth and held 95% survival with half- and single-rate frass (0.325–0.65 g N/plant); synthetic NPK dropped survival to 5%.
BSF residues increased basal respiration 16%, plant yield 17%, and encouraged Bacillus/Mortierella populations while matched NH4NO3 for ryegrass yields—evidence that frass feeds microbes before plants.
Downloads & links
These resources pair well with the studies above when pitching clients or writing grant proposals.
We collaborate with universities and private labs to design plots, capture microbial data, and translate findings into SOPs.