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Title: Sustainable Reclaimed Water Management by Subsurface Drip Irrigation System: a study case for forage production
Authors: Palacios Díaz, María Del Pino 
Mendoza Grimón, Vanessa Reyes 
Fernandez, F.
Fernández Vera, Juan Ramón 
Hernandez-Moreno, J. M.
UNESCO Clasification: 310307 Cultivos forrajeros
310391 Uso (manejo) combinado del agua y fertilizantes
330810 Tecnología de aguas residuales
Keywords: Advanced Treatment
Reclaimed-Water Management
Sdi, et al
Issue Date: 2008
Journal: Water Practice and Technology 
Abstract: In the Canary Islands the price fluctuation of groundwater (0.3 to 0.7 (sic)/m(3)), which is a private resource, often limits the recovery of the agricultural investments. Availability of alternative resources (reclaimed water: RW, desalinized seawater: DW and desalinized reclaimed water: DRW) at a foreseeable price will allow people to design the optimal infrastructures adapted to their needs The pumping cost is included in the "public" water price of DW (0.6 (sic)/m(3)), RW (0.2 (sic)/m(3)) and DRW (0.42 (sic)/m(3)), but only if it is under 300 m of altitude. As a subsurface irrigation system (SDI), uses the soil as a natural advanced (but not high cost) water treatment, the in situ reuse of RW produced by lower tech wastewater plants would provide a valuable resource for the small villages.A successful study case is presented here. A 2-year SDI experiment was performed using RW, cultivating alfalfa (Medicago sativa) and Sudan grass hybrid (Sorghum bicolor ssp sudanense). Although a saline (EC: 2.24 dS/m) and sodic (SAR: 6.9) water was used, irrigation with SDI led to high forage yields (between 8.4 and 11.9 kg of fresh matter/m2 obtained by 8 harvests per year). However, sand filter and drip lines have to be cleaned weakly and every 6 months respectively. As a conclusion of this study, adequate plant germination and yields, and feasibility of SDI using a secondary effluent was demonstrated. Besides, water cost represents only 24 to 17 % from the gross income.
ISSN: 1751-231X
DOI: 10.2166/WPT.2008049
Source: Water Practice And Technology [ISSN 1751-231X], v. 3 (2), (Junio 2008)
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