Journal of Rural Research

Journal of Rural Research

Water Scarcity, Irrigation Infrastructure, and Smallholder Citrus Viability under Climate Stress in South Africa’s Limpopo Province: A Stochastic Frontier Analysis

Document Type : Research Paper

Author
Samuel Joseph
CAES, University of South Africa (UNISA)
10.22059/jrur.2026.417716.2132
Abstract
A B S T R A C T
Water scarcity represents the most binding biophysical constraint on agricultural production in Limpopo Province, South Africa, yet its quantitative impact on the profit efficiency and long term viability of smallholder citrus producers remains inadequately documented. This study employs stochastic frontier analysis to estimate the production and profit efficiency implications of water quantity constraints and water cost escalation among 220 citrus smallholder production units surveyed across five district municipalities in Limpopo Province. Maximum likelihood estimation results for the normalised profit frontier model reveal that water quantity is the dominant negative predictor of production outcomes (coefficient beta = 0.671, p < 0.001), while water cost is the second largest positive predictor in the profit function (beta = 0.365, p < 0.001) after fertiliser cost (beta = 0.380, p < 0.001), together explaining over 40% of the explained variance in normalised profit. Mean profit efficiency is estimated at 0.74, with water access insecurity identified as the primary driver of profit efficiency shortfalls in the sub group of farmers scoring below the 0.60 viability threshold. Analysis of irrigation infrastructure conditions reveals that 62.3% of sampled production units operate below optimal irrigation system efficiency, and that inadequate water access was rated the most severe adaptation barrier in the dataset, with a mean Likert severity score of 4.2 out of 5.0. Ordinal logistic regression confirms that water access insecurity is the second strongest negative predictor of climate adaptation intensity (OR = 0.51, p < 0.001). These results carry direct implications for the South African National Water and Sanitation Master Plan, agricultural water pricing reform, and the integration of irrigation infrastructure investment into the country’s climate adaptation strategy for commercial horticulture.
Keywords
Citrus Production
Profit Efficiency
Water Governance
Water Pricing Reform
South Africa Agriculture
Climate Change Adaptation.
Subjects
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Journal of Rural Research
Volume 17, Issue 2
Summer 2026
Pages 15-28

  • Receive Date 17 April 2026
  • Revise Date 04 June 2026
  • Accept Date 29 June 2026