الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
 |  | from | 105 |  |  |
| | | from | 105 | | |
Abstract
INTRODUCTION
Improved-on-~arm irrigation systems is considered an
important part for Egyptian Agriculture development. Tha
ability of thes~ systems to deliver adequate timely
irrigation to all field plots is necessary to ensure good
yield and allieviate any water stress. In parallel,
conveyance and operational losses should be kept to a
minimum if the ef~iciency of this part of the whole
irrigation system (which also includes the main system)
is to be maximized. Increasing system efficiency is
viewed as a key issue to conserve water from old land and
avail it to new land. Future of land reclamation projects
and vertical expenasion depend on ensuring irrigation
water from the country·s presently exchausted water
resources.
Trickle irrigation is the newest of all commercial
methods of water application. It is a system where water
and fertilizer are applied directly to a part of the
plant root zone. Water is applied on a frequent, often
daily basis, to prevent moisture stress in the plant by
maintaining favorable soil moisture conditions. In trickle
irrigation the water is applied to the soil through
mechanical devices called emitters or drippers located at
selected points along the water lines. Most emitters are
placed on the ground, but they can be under the ground.
The emitters dissipate the pressure from the distribution
1