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Please use this identifier to cite or link to this item: http://hdl.handle.net/10400.5/2687

Title: Assessing economic impacts of deficit irrigation as related to water productivity and water costs
Authors: Pereira, L.S.
Rodrigues, G.S.
Keywords: deficit irrigation
water produtivity
water costs
economic impact
Issue Date: 2009
Publisher: Elsevier
Citation: "Biosystems Engineering". ISSN 1537-5110. 103(2009) 536-551
Abstract: This study aims at assessing the feasibility of deficit irrigation of maize, wheat and sunflower through an analysis of the economic water productivity (EWP). It focuses on selected sprinkler-irrigated fields in Vigia Irrigation District, Southern Portugal. Various scenarios of water deficits and water availability were considered. Simulations were performed for average, high and very high climatic demand. The potential crop yields were estimated from regional climatic data and local information. Using field collected data on yield values, production costs, water costs, commodity prices and irrigation performance, indicators on EWP were calculated. Results show that a main bottleneck for adopting deficit irrigation is the presently low performance of the irrigation systems used in the considered fields, which leads to high water use and low EWP. Decreasing water use through deficit irrigation also decreases the EWP. Limited water deficits for maize are likely to be viable when the irrigation performance is improved if water prices do not increase much, and the commodity price does not return to former low levels. The sunflower crop, despite lower sensitivity to water deficits than maize, does not appear to be a viable solution to replace maize when water restrictions are high; however it becomes an attractive crop if recently high commodity prices are maintained. With improved irrigation performance, wheat deficit irrigation is viable including when full water costs are applied, if former low prices are not returned to. However, under drought conditions full water costs are excessive. Thus, adopting deficit irrigation requires not only an appropriate irrigation scheduling but higher irrigation performance, and that the application of a water prices policy would be flexible, thus favouring the improvement of the irrigation systems.
Description: Research Paper:SW-Soil and Water
Peer Reviewed: yes
URI: http://hdl.handle.net/10400.5/2687
ISSN: 1537-5110
Publisher version: www.elsevier.com/locate/issn/15375110
Appears in Collections:DER - Artigos de Revistas

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