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Marginal Value of Irrigation Water in Wheat Production Systems of Central Tunisia

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  • Frija, Aymen
  • Chebil, Ali
  • Cheikh M'Hamed, Hatem

Abstract

Recent studies on the economics of agricultural water management in Tunisia report a low water productivity of some presently widely cultivated crops such as durum wheat. The objective of this study is to estimate water productivity and marginal value of irrigation water applied to durum wheat in central Tunisia, region of Kairouan. We develop a production function, in which the irrigation revenue of farmers per hectare is expressed in terms of the used water volume in addition to other production factors. Results show that 31.7 % of farmers were applying water volumes above the economic optimal volume (more than 2900 mm/ha). Moreover, 50 % of farmers were found to be applying less irrigation water than this optimal volume. Applying water above the optimal volume means that the benefit farmers generate from each supplementary unit of irrigation water is lower than the market price of irrigation water currently applied in the region (0.110 TND/m3). Water is then wasted. However, using less water than this optimal volume means that farmers can make further supplementary irrigations and generate more benefit from it (extra-yield). The study also shows that most of farmers in the study area are not performing the irrigation scheduling and the appropriate irrigation doses. Improving these irrigation performances will surely preserve the water resources and enhance the food security in Tunisia.

Suggested Citation

  • Frija, Aymen & Chebil, Ali & Cheikh M'Hamed, Hatem, 2013. "Marginal Value of Irrigation Water in Wheat Production Systems of Central Tunisia," 2013 Fourth International Conference, September 22-25, 2013, Hammamet, Tunisia 160525, African Association of Agricultural Economists (AAAE).
    • Handle: RePEc:ags:aaae13:160525
    DOI: 10.22004/ag.econ.160525
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    References listed on IDEAS

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    1. Dhehibi, Boubaker & Lachaal, Lassaad & Elloumi, Mohamed & Messaoud, Emna B., 2007. "Measuring irrigation water use efficiency using stochastic production frontier: An application on citrus producing farms in Tunisia," African Journal of Agricultural and Resource Economics, African Association of Agricultural Economists, vol. 1(2), pages 1-15, September.
    2. Molden, David & Oweis, Theib & Steduto, Pasquale & Bindraban, Prem & Hanjra, Munir A. & Kijne, Jacob, 2010. "Improving agricultural water productivity: Between optimism and caution," Agricultural Water Management, Elsevier, vol. 97(4), pages 528-535, April.
    3. Dugan, Patrick & Dey, Madan M. & Sugunan, V.V., 2006. "Fisheries and water productivity in tropical river basins: Enhancing food security and livelihoods by managing water for fish," Agricultural Water Management, Elsevier, vol. 80(1-3), pages 262-275, February.
    4. Playan, Enrique & Mateos, Luciano, 2006. "Modernization and optimization of irrigation systems to increase water productivity," Agricultural Water Management, Elsevier, vol. 80(1-3), pages 100-116, February.
    5. Wesseling, J.G. & Feddes, R.A., 2006. "Assessing crop water productivity from field to regional scale," Agricultural Water Management, Elsevier, vol. 86(1-2), pages 30-39, November.
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    1. Houda Mazhoud & Fraj Chemak & Hatem Belhouchette & Roza Chenoune, 2022. "A Bio-Economic Model for Improving Irrigated Durum Wheat Performance and Regional Profits under Mediterranean Conditions," Agriculture, MDPI, vol. 12(5), pages 1-25, April.

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