|Author:||Amer, K. M. ; Hussien, T. M.|
|Book Group Author:||NA|
A study was carried out from 1993 to 1999 to evaluate reuse of drainage water for irrigation in the Nile Delta, Egypt, and to alleviate its negative impacts such as salt accumulation in profiles. The soil salinity study has been carried out in three different locations in the delta, and showed that soil salinity build-up and ionic levels were not constant - in some areas there was a clear link between the salinity of applied water and soil build-up. (Nubaria, with its light permeable soil was a good example). In areas with heavier, less permeable soils and shallow water tables (such as Hamoul) the links were less clear (due to the applied water salinity not being the main factor that controlled soil salinity). The study has shown that drainwater reuse does not necessarily lead to increased salinity build-up. The Hamoul drainwater area had lower soil salinity and ionic levels than the respective mixed and fresh water areas. This was attributed to: good natural drainage at the study area, the application of additional irrigation water for leaching, and good management. Strategies to minimize soil salinity levels and achieve sustainable agriculture development include:- (i) controlling soil salinity, in light soils with deep water table, by the quality and quantity of applied water, (ii) in heavy soils with shallow water table (where the situation is much more complicated by salt contribution coming from both the applied water and the saline water table), the use of a good sub-surface drainage system to prevent upward flow of saline water table to the root zone and also to collect the leached salts through soil profile and into the drains.
control, delta soils, drainage water, recycling, salts insoil, soil salinity, subsurface drainage, Egypt, North Africa, Africa,Mediterranean Region, Middle East, Developing Countries, Soil WaterManagement (Irrigation and Drainage) (JJ800) (Revised June 2002)[formerly Soil Water Management], Soil Chemistry and Mineralogy (JJ200)