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• W1766869630 abstract "Water saving in irrigation is a main issue in the Yellow River basin. Field studies were conducted in two areas: The Huinong Irrigation District (HID), Ningxia Province, in the upper reaches, where excess irrigation water is applied giving rise to water-logging and salinity problems, and the Bojili Irrigation District (BID), Shandong Province, in the lower reaches of the river basin, where water availability is insufficient and salinity is related to drainage reuse. To control such problems, improved irrigation scheduling may play an important role. The irrigation scheduling simulation model ISAREG was used to evaluate the current schedules and to generate improved ones. It computes the capillary rise from the watertable and deep percolation when excess water is applied, and considers the effects of salinity in crop evapotranspiration, crop water stress and yields, as well as the leaching requirements. The model has been previously calibrated and validated for North China. The model has been explored interactively with surface irrigation simulation models to consider the limitations imposed by the field systems concerning depths to be applied and irrigation performances. For HID, improvements consist of reducing the number of irrigations and adopting new calendars according to the depth of watertable and the soil salinity conditions. Percolation could then be reduced from the current 60% of the applied depths to only the volumes required for leaching. Water saving would represent more than 33%, salinity could be controlled and drainage would be improved. For BID, current schedules are appropriate and the main issues concern deficit irrigation to cope with present water shortages. For both applications, it is concluded that effectiveness of irrigation scheduling improvements highly depend on required betterment in the basin irrigation systems mainly relative to land leveling, inflow discharges and field sizes." @default.
• W1766869630 created "2016-06-24" @default.
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• W1766869630 date "2003-07-01" @default.
• W1766869630 modified "2023-09-24" @default.
• W1766869630 title "Water Saving in the Yellow River Basin, China. 1. Irrigation Demand Scheduling" @default.
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