|Author:||Kume, T. ; Nagano, T. ; Watanabe, T. ; Mitsuno, T. ; Chaolunbagen|
|Book Group Author:||NA|
The EIM (Electromagnetic Induction Method) was used to track the salt dynamics of poorly drained fields during leaching irrigation in China's Hetao irrigation district. In a 0.3 ha study area, soil salinity and micro-topographical observations at over 700 points, with groundwater level and salinity at 17 points, were spatially analysed to determine the inter-relationships between soil salinity, irrigation water path, and groundwater. The results showed that leaching irrigation is not efficient for eliminating soil salinity problems in poorly drained areas. The heterogeneous distribution of soil salinity may be reduced if land is levelled more carefully, but the lack of drainage is the main constraint. There is an urgent need to classify the entire Hetao irrigation district according to how well areas are drained and to determine the fundamental movement of groundwater and salinity on a large scale.
|Journal:||Transactions of the 19th International Congress on Irrigationand Drainage, Beijing, China, 2005. Vol 1B: Water quality, salinitymanagement|
drainage, groundwater flow, groundwater level, irrigation,leaching, leaching requirement, levelling, microrelief, soil salinity,spatial distribution, China, Nei Mongol, East Asia, Asia, DevelopingCountries, Northern China, China, countries, watering, Soil Chemistryand Mineralogy (JJ200), Soil Fertility (JJ600), Soil Physics (JJ300),Soil Water Management (Irrigation and Drainage) (JJ800) (Revised June2002) [formerly Soil Water Management]