الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 259 |  |  |
| | | from | 259 | | |
Abstract
Most of the northeastern parts of the Nile Delta include areas with complicated problems. They are considered problematic areas. The main problems are distinguished with low-lying areas, clay to heavy clay soils with low permeability, saline to saline-sodic soils, shallow and saty ground water, and artesian zone. Drainage is an important factor to overcome these interference problems. It should be sid that the calculated spacing between tile drainage laterals is usually too narrow which not economically used. Therefore, wider spacing accompanied with auxiliary treatments should be tested to increase the efficiency of subsurface drainage.
The aim of the present work is to study soil properties as affected by drainage types of evaluating improvement soil condition to sustain land use for maximizing crop production and prevent soil deterioration.
For this purpose, a representing area was chosen at the farm belongs to El-Serw research station, Agriculture research center, in the northeastern Delta, Dakahlia governorate. The field trials were carried out at 20 feddan (1feddan = 4200m2) during winter 1996 – 1997, summer 1997 and winter 1997 – 1998 seasons. The cultivation crops were wheat, sorghum, and clover, respectively. The split plot desin was used with three replicates. The experimental field was designed with three-drain spacing treatments, 15m., 30m. and 60 metre separated by buffer zones. The sub-main treatments represented two types of subsoiling, parallel and net subsoiling with 1.5 metre apart and 5 cm depth.