Sub-Saharan Africa faces an severe food security challenge driven by widespread soil degradation, severe nutrient mining, and erratic climate patterns. Smallholder farmers produce eighty percent of the region’s food on rapidly deteriorating soils while managing low mineral fertilizer inputs due to prohibitively high supply costs. Traditional agricultural intensification remains financially unreachable for most producers and environmentally risky for regional ecosystems. To determine sustainable alternatives, researchers synthesized evidence from 317 peer-reviewed studies published between 2010 and 2025 across 28 African nations. The meta-analysis systematically quantified how living bio-inputs and engineered advanced materials enhance crop productivity, nutrient use efficiencyNutrient use efficiency refers to how effectively plants can take up and utilize nutrients from the soil. Biochar can improve nutrient use efficiency by enhancing nutrient availability and retention in the soil.   More, and plant resilience against environmental stresses.

Across 8,641 paired comparisons, the overall random-effects model demonstrated a statistically significant treatment response over unamended controls. Standardized effect sizes measured through Hedges’ g showed that advanced agricultural inputs deliver large positive gains across diverse farming environments. Integrated soil fertility management systems combining organic amendments, mineral fertilizers, and microbial inoculants produced the highest pooled effect size of 1.47. Among single-technology categories, zinc oxide nanoparticles generated the second-highest individual effect size of 1.24 by improving cellular stress responses and plant hormone regulation under severe water scarcity and high heat. Plant growth-promoting rhizobacteria consortia achieved an effect size of 0.91, silicon dioxide nanoparticles reached 0.88, rhizobium inoculants scored 0.82, arbuscular mycorrhizal fungiThese are friendly fungi that form a partnership with plant roots. They act like an extension of the root system, helping plants access water and nutrients more effectively. Biochar can create a cozy habitat for these helpful fungi, boosting their growth and improving plant health.   More reached 0.75, and biocharBiochar is a carbon-rich material created from biomass decomposition in low-oxygen conditions. It has important applications in environmental remediation, soil improvement, agriculture, carbon sequestration, energy storage, and sustainable materials, promoting efficiency and reducing waste in various contexts while addressing climate change challenges. More amendments achieved 0.69.

Environmental and management factors significantly altered technology performance across the continent. Treatments deployed in semi-arid zones receiving under 400 millimeters of annual rainfall achieved the highest relative yield improvements, reaching a mean effect size of 1.18. Legume crops like soybean, cowpea, and common bean displayed the strongest responses to inoculants with a mean effect size of 1.12, supported by enhanced biological nitrogen fixationNitrogen is a crucial nutrient for plant growth, but plants can’t directly absorb it from the air. Nitrogen fixation is a process where certain bacteria convert atmospheric nitrogen into a form that plants can use. Biochar can provide a home for these nitrogen-fixing bacteria, enhancing More and improved microbial phosphorus solubilization. Combining seed and soil application methods proved vastly superior to single application routes. Furthermore, multi-year study durations correlated positively with expanding performance gains, confirming that long-term treatments progressively rebuild soil organic carbon, boost beneficial microbial populations, and enhance water-holding capacity over successive seasons.

In addition to expanding harvests, smart inputs delivered major physiological and environmental benefits. Across reported cereal trials, treatments increased agronomic nitrogen use efficiency by 28.4 percent and phosphorus use efficiency by 35.2 percent over conventional fertilization protocols. Foliar zinc nanoparticle treatments simultaneously achieved agronomic biofortification, increasing grain zinc content by up to 94 percent in drought-stressed sorghum and directly addressing widespread regional micronutrient deficiencies. Despite these documented advantages, adoption rates across Sub-Saharan Africa remain below five percent due to short inoculant shelf-lives, unstandardized product quality, high nano-synthesis expenses, and weak rural extension networks. Overcoming these distribution bottlenecks through national regulatory standards, local waste-based production, and updated subsidy frameworks offers a clear technical pathway toward sustainable food self-sufficiency.

Source: Mng’ong’o, M. E., & Shayo, P. (2026). Smart inputs for stressed soils: assessment of biofertilizers, nanomaterials, biochar, and biostimulants for sustainable crop productivity in Sub-Saharan Africa. Discover Agriculture, 4(1), 280.