|Author:||Marlet, S. ; Vincent, B. ; Vidal, A. ; Bouarfa, S. ; Wu, J. ; Yang, J. ; N'Diaye, M. K. ; Kuper, M. ; Zimmer, D.|
|Book Group Author:||NA|
Trends in water management and soil salinity are assessed through studies in China, Mali, Pakistan and Uzbekistan. In China, the upper valley of the Yellow River (Huinong irrigation district) is characterized by aridity, good water availability, over-irrigation, but also secondary salinisation due to elevated water-tables; in the lower valley, shortage of irrigation water has lead to reuse of low quality drainwater to assist leaching. In Mali, soils are affected by sodification due to irrigation water quality. Perennial irrigation is creating a shallow water table. In Pakistan, shortage of irrigation surface water has lead to a increased conjunctive use of low quality groundwater. Although the water table has lowered and soil salinity has decreased under improved leaching, soil sodicity has worsened. In Uzbekistan (Fergana Valley), a deep drainage system to reduce waterlogging and control soil salinity has seen its benefits strongly offset by the mobilisation of highly saline groundwater and consequent salinisation of plains irrigated by the receiving waters of the saline drainwater. The paper identifies that salinity management requires methodologies appropriate to the involved process, and to the impact on the system.
|Journal:||Transactions of the 19th International Congress on Irrigationand Drainage, Beijing, China, 2005. Vol 1B: Water quality, salinitymanagement|
distribution, drainage systems, drainage water, groundwater,irrigation systems, irrigation water, saline water, salinity,salinization, salts, sodic soils, soil alkalinity, soil salinity, soiltypes, trends, water management, water quality, China, Mali, Pakistan,Uzbekistan, East Asia, Asia, Developing Countries, West Africa, AfricaSouth of Sahara, Africa, Least Developed Countries, ACP Countries,Francophone Africa, South Asia, Commonwealth of Nations, West Asia,Developed Countries, Central Asia, salt water, water composition andquality, water resource management, Water Resources (PP200), Soil WaterManagement (Irrigation and Drainage) (JJ800) (Revised June 2002)[formerly Soil Water Management], Soil Fertility (JJ600), Soil Physics(JJ300), Soil Chemistry and Mineralogy (JJ200)