Ladies Asparagus Farm in Ficksburg in the Free State recently played host to a groundbreaking agricultural demonstration that could reshape how small-scale farmers approach crop nutrition.
By Maile Matsimela, digital editor at African Farming
On 5 February, the Agricultural Research Council (ARC) conducted a Bioslurry Living Lab Farmer Field Day at the farm, showcasing the potential of biogas liquid byproducts as a sustainable alternative to conventional fertilisers.
Research in Action
Dr Ntobeko Mchunu, a researcher with the ARC’s Farmer Support Division, and Dr Dikonketso Matjuda from the ARC’s Animal Production Research department presented compelling evidence for bioslurry’s agricultural potential. The event featured on-farm field trials comparing potato yields across four different treatments: control plots with no fertiliser, farm manure, synthetic NPK and bioslurry applications.
The results were striking. Bioslurry not only matched synthetic fertiliser performance but often produced higher total tuber yields, while demonstrating superior plant growth parameters including increased leaf number, larger leaf size and enhanced plant height. Perhaps most importantly for resource-constrained farmers, bioslurry showed better soil integration and reduced disease risk compared with raw manure, which exhibited nematode problems during the trials.
Also watch: From waste to wealth: ARC experts guide farmers on the biogas opportunity
Circular Economy Benefits
What makes bioslurry particularly attractive is its origin as a waste-derived product that fits perfectly into circular economy principles. As the liquid byproduct of biogas production, it transforms agricultural waste into valuable fertiliser, offering farmers a locally produced alternative to expensive synthetic inputs – a crucial advantage given recent global supply chain disruptions and price volatility.
The demonstration at Ladies Asparagus Farm provided practical insights into real-world application methods and crop response outcomes, showing attendees how bioslurry can be successfully integrated into existing farm operations without affecting crop maturity timelines.
Also read: Lower fertiliser prices expected, says Omnia
Looking Forward
The research team plans to conduct further analyses including nutrient balancing and comprehensive soil and tissue studies to quantify efficiency and develop final recommendations. For the small-scale farmers in attendance, the field day represented more than just a research presentation, as it offered a glimpse into a more sustainable and economically viable future for South African agriculture.
As farmers face increasing pressure from rising input costs and environmental concerns, innovations like bioslurry show that solutions often lie in reimagining waste as resource, turning yesterday’s agricultural byproducts into tomorrow’s crop nutrition solutions.
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