What does this research mean for the field?

High-value vegetable crops generate significantly greater economic returns and superior risk-adjusted margins of safety compared to low-value crops or diversified portfolios, demonstrating that smallholder economic transformation depends on closing profitability gaps rather than yield gaps. Novelty: ClaimNovelty.CONTRADICTORY. Consensus alignment: ConsensusAlignment.CHALLENGES_CONSENSUS.

What question did this study set out to answer?

This research investigates the profitability dynamics and crop choices among smallholder vegetable farmers in Nigeria.

June 8, 2026Open Access

Profitability and crop choice dynamics in Nigerian smallholder vegetable systems and implications for intervention design in Benue State

Key Points

This research investigates the profitability dynamics and crop choices among smallholder vegetable farmers in Nigeria.
Conducted a full-cost profitability analysis of six vegetable crops among 30 smallholders under a specific intervention.
Calculated Economic Farm Income (EFI) and Return on Investment (ROI) using full-cost accounting methods.
Used ANOVA with Tukey HSD and break-even analysis to assess profitability and risk resilience.
High-value crops like pepper and tomato showed EFI values significantly greater than low-value crops like ewedu, with pepper yielding ₦447,600/ha.
All crops displayed similar risk profiles with coefficients of variation ranging from 0.20 to 0.25, negating the advantage of safer low-value crops.
Pepper provided the largest margins of safety (44.7%) and specialized pepper achieved higher risk-adjusted returns compared to diversified portfolios.

Abstract

Agricultural development in sub-Saharan Africa remains trapped in a yield-centric paradigm that confuses biological output with economic welfare. This study conducted a comparative, full-cost profitability analysis of six vegetable crops: Amaranthus, Okra, Cucumber, Ewedu, Pepper, and Tomato, cultivated by 30 smallholders under the Sasakawa Africa Association’s Family Business Garden intervention in Benue State, Nigeria. Economic Farm Income (EFI) and Return on Investment (ROI) were calculated using full-cost accounting. ANOVA with Tukey HSD assessed profitability differentials; break-even and portfolio variance examined risk resilience. Three paradigm-shifting findings emerge. First, high-value crops (pepper: ₦447600/ha; tomato: ₦424,100/ha) generate EFI values 2.8 times greater than low-value ewedu (₦158,400/ha), rejecting the low-cost, short-cycle advantage hypothesis. Profitability is driven by unit price ( r = 0.89), not yield ( r = 0.31). Second, coefficients of variation are statistically indistinguishable across all six crops (CV = 0.20–0.25), revealing constant proportional risk (σ = kµ, k ≈ 0.25). Low-value crops offer no proportional safety advantage. Third, specialized pepper achieves superior risk-adjusted returns (mean/SD = 4.43) versus diversified portfolios (4.15), rejecting diversification advantage under constant relative risk. Break-even analysis delivers the final policy reversal: pepper (44.7%) and tomato (42.1%) provide the largest margins of safety, while ewedu offers only 13.5% downside protection. Education is the strongest profitability correlate (ROI: r = 0.41, p < 0.001). Closing profitability gaps, not yield gaps, emerges as the singular pathway to smallholder economic transformation.

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