Title:
Inoculated Biochar Fertiliser Production with Bio-oil derived Herbicidal, Pesticidal and Nematicidal Properties
Author(s):
van Tonder, G.C., Botha, W.N.
Document(s):
Paper
Abstract:
A novel fully-organic fertilizer was formulated by integrating biochar with nutrient-rich bio-waste and pyrolysis by-products. The approach utilizes biochar from mixed feedstock (wood and manure) inoculated with pyrolysis liquids (bio-crude oil and pyroligneous acid) and supplemented with organic additives to achieve competitive nutrient levels and added agronomic benefits. Key innovations include the use of bio-oil fractions containing natural herbicidal, pesticidal, and nematocidal compounds, and a slow-release nutrient matrix via biochar and polymerized heavy tar coating. Analytical results showed the formulated fertilizers reaching target N:P:K ratios (e.g. 5:1:2 and 2:1:1) with total N up to 5% and substantial secondary nutrients (Ca, Mg) and micronutrients. GC-MS and elemental analyses confirmed the presence of beneficial components such as organic acids, flavonoids, nitrogen-containing compounds (e.g. nitriles, amides) and bio-oil-derived biocides (e.g. furfural, fervently) in the fertilizer. These compounds contribute to immediate and sustained nutrient availability, enhanced soil microbiome activity, and suppression of pests and pathogens. Comparisons to conventional fertilizers indicate that the biochar-based fertilizer can provide similar macro-nutrient value while dramatically improving soil health and nutrient retention. The product is sourced entirely from sustainable waste streams, aligning with circular economy and climate-smart agriculture goals.
Keywords:
fertilization, pyrolysis, pyrolysis oil, biochar
Topic:
Biomass Conversion to Intermediate Bioenergy Carriers and Sustainable Biofuels
Subtopic:
Pyrolysis
Event:
33rd European Biomass Conference and Exhibition
Session:
5AV.4.12
Pages:
956 - 961
ISBN:
978-88-89407-25-7
Paper DOI:
10.5071/33rdEUBCE2025-5AV.4.12
Price:
FREE
