South Africa’s agri-chemical dependency persists despite rhizobia tech: structural barriers block agroecological transition

Indigenous South African farming systems, such as those of the amaXhosa and amaZulu, historically relied on nitrogen-fixing plants (e.g., *Vicia faba* and *Cajanus cajan*) and microbial-rich compost to maintain soil fertility without synthetic inputs. These practices were systematically undermined by colonial land dispossession and apartheid-era policies that criminalized communal farming, replacing them with extractive monocultures. Modern rhizobia-based technologies echo these traditional methods but are framed as 'innovative' rather than as reclaimed indigenous knowledge, reinforcing a colonial epistemic hierarchy.

The slow adoption of rhizobia fertilisers in South Africa is rooted in a century-long trajectory of agricultural policy that prioritized chemical inputs, beginning with colonial 'scientific farming' experiments in the late 1800s and accelerating under apartheid-era state-led industrialization. Post-apartheid land reform programs failed to address the structural barriers to agroecological transition, instead reinforcing export-oriented, high-input agriculture through subsidies and trade agreements. Historical parallels exist in India, where the Green Revolution’s chemical dependency displaced traditional seed systems, and in Brazil, where soy monocultures expanded at the expense of indigenous and peasant farming.

Across Africa, indigenous soil management practices—such as the use of *Mucuna pruriens* in West Africa or *Tephrosia vogelii* in East Africa—demonstrate that rhizobia-based fertility enhancement is not a novel concept but a reclaimed traditional knowledge. In contrast, Western agricultural science often frames soil health as a problem requiring external technological intervention, a paradigm that has led to the current global soil degradation crisis. Comparing South Africa’s situation to Cuba’s post-Soviet agroecological transition reveals how policy shifts and farmer-led innovation can drive systemic change, even in resource-constrained contexts.

Rhizobia bacteria form symbiotic relationships with leguminous plants, converting atmospheric nitrogen into bioavailable forms that reduce or eliminate the need for synthetic fertilisers. Meta-analyses show that rhizobia inoculation can increase crop yields by 10–30% while reducing greenhouse gas emissions by up to 50% compared to conventional systems. However, the scientific literature often underemphasizes the socio-economic barriers to adoption, such as access to rhizobia inoculants, farmer training, and policy support for smallholders. Additionally, most studies focus on yield outcomes rather than long-term soil health or biodiversity benefits.

In many African cosmologies, soil is not merely a resource but a living ancestor (*inkosi yezibulo* in Zulu thought), requiring reciprocity and care rather than exploitation. Traditional farming songs and rituals, such as the *ukubuyisa* ceremonies of the amaZulu, encode knowledge about seasonal planting and soil enrichment, linking agricultural practice to spiritual well-being. Modern agroecology could reclaim this holistic perspective by integrating indigenous cosmologies with scientific soil microbiology, fostering a more regenerative relationship with the land.

Scenario modelling suggests that a 50% reduction in synthetic fertiliser use in South Africa by 2035 is achievable through policy incentives, farmer cooperatives, and rhizobia technology scaling, but requires dismantling input subsidies and investing in rural extension services. Without structural reforms, South Africa’s agricultural sector risks further soil degradation, water pollution, and climate vulnerability, with smallholder farmers bearing the brunt of these crises. Comparative case studies from Ethiopia and Malawi show that agroecological transitions can reduce poverty by 20–30% while improving food sovereignty, but success depends on equitable land tenure and market access.

Smallholder farmers, particularly women and indigenous communities, are systematically excluded from decision-making in agricultural policy, despite being the primary stewards of seed and soil knowledge. The narrative’s focus on 'farmers' as a homogenous group obscures the gendered division of labour in farming, where women—who perform 60–80% of agricultural work in South Africa—are often denied access to land, credit, and technology. Additionally, the framing ignores the role of informal seed networks and women-led cooperatives in preserving and adapting rhizobia-based practices, which are critical to agroecological resilience.