Why many South African small-scale farmers hesitate to adopt sustainable biological fertilisers
Amid growing concerns over the environmental and economic impacts of chemical fertilisers, sustainable alternatives such as biological fertilisers are gaining attention. However, research shows that many small-scale farmers in South Africa remain reluctant to replace synthetic fertilisers with eco-friendly options like rhizobia-based products.
The promise of biological fertilisers
Rhizobia bacteria naturally fix atmospheric nitrogen into forms accessible to plants, especially legumes such as soybeans, common beans, and bambara nuts. Biological fertilisers harness this process, enriching soil nutrients, boosting crop growth, and improving soil microbial diversity. Unlike chemical fertilisers, they persist longer in the soil and reduce negative impacts such as eutrophication — the oxygen depletion of water bodies caused by nutrient runoff.
Moreover, rhizobia can enhance drought tolerance and even improve the medicinal properties of some plants like the cancer bush, a traditional anti-inflammatory remedy and immune booster in South Africa.
Barriers to adoption
Despite awareness of their benefits, small-scale farmers often face significant hurdles in adopting biological fertilisers. Fieldwork in Phiring village, Limpopo Province, highlighted that many farmers have limited access to these products and insufficient knowledge about their use. They typically rely on chemical fertilisers supplied for free by government programmes, such as the Comprehensive Agricultural Support Programme.
Farmers also voiced concerns and misconceptions — for instance, assuming that biological fertilisers cause slower plant growth or lower yields, discouraging experimentation. Peer influence and traditional practices also weigh heavily, while many farmers do not conduct regular soil analysis, making appropriate fertiliser choices difficult.
Opportunities for change
Integrating biological fertilisers into existing government support schemes could boost uptake significantly. Training and extension services are essential to educate farmers on proper application and dispel misconceptions.
Furthermore, biological fertilisers benefit not only legumes but also non-legume crops through intercropping and crop rotation, improving overall soil fertility and farm productivity.
Conclusion
Addressing financial constraints, improving availability, and enhancing farmer knowledge are critical steps to help South African small-scale farmers transition toward sustainable fertiliser use. This shift aligns with wider goals of sustainable agriculture, environmental protection, and climate resilience, contributing to stronger rural livelihoods and healthier ecosystems.
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