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• W2168940403 abstract "The Guadalquivir river marshes in southwest Spain, are situated in a former estuary that has now been drained. They cover some 140 000 ha. Soils formed in this zone are alluvial, very clayey, salinesodic, and of vertic character with a shallow, very-saline water table. An area within these marshes, reclaimed in 1979, is the object of this detailed study which looks at some physical and chemical properties of soil, and also the influences of sprinkler and furrow irrigation on drainage and salt leaching. These studies were conducted between 1988 and 1990. A 1 ha experimental plot was used for this purpose. The plot is situated within an area of the marshes being used for standard agricultural practices, equipped with a drainage system of ceramic pipes buried 1 m deep and spaced 10 m apart, ending at an open ditch collector which is perpendicular to them. The following measurements have been carried out: soil bulk density changes with water content, hydraulic conductivity and sorptivity, soil water content and water tension profiles changes, water table level, drainage outflow and salt content of soil, soil solution and drainage water. Cotton was used as the crop. The results obtained show that after ca. 10 years in reclamation the electrical conductivity and exchangeable sodium percentage decreased in the 0–90 cm layer of this soil, particularly in the top 50 cm, that reduces the adverse effects of salinity on crop development. During both sprinkling and furrow irrigation a rapid response of the drain pipes was observed because of the soil fissures and crack network that resulted from the shrinking and swelling processes. Maximum drainage outflow was reached when the irrigation stopped. Water movement in this soil is characterized by an initial rapid phase, due to the soil fissures and cracks, followed by a second slow one controlled by the soil matrix. The efficiency of irrigation in salt leaching was higher in the case of furrow irrigation (16 g of salt leached per litre of applied water) than in the case of sprinkling irrigation (10 g l−1), owing to the use of more water in the latter. The salinity of soil and soil solution decreases after irrigation starts, the time taken to reach a minimum value for the different soil layers and the irrigation method used were different. In 1989 due to water restrictions at some time of the crop period, the irrigation schedule was different to that normally used, and the crop was affected by water stress and capillary rise of saline water." @default.
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• W2168940403 date "1995-04-01" @default.
• W2168940403 modified "2023-10-18" @default.
• W2168940403 title "Water movement and salt leaching in drained and irrigated marsh soils of southwest Spain" @default.
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• W2168940403 doi "https://doi.org/10.1016/0378-3774(95)01128-6" @default.
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