الفهرس 
review of literatureOnly 14 pages are availabe for public view
 |  | from | 187 |  |  |
| | | from | 187 | | |
Abstract
The importance of increasing wheat production in Egypt
needs no more emphasize. The yield of grains per unit area
depends on number of tillers and number of spikes per unit
area, number of grains per spike and the average weight of
the grain. The life period of wheat plant expands for about
160 days during which all the developmental changes occur.
Such period may be divided into two phases, namely the
vegetative stage where number of tillers and number of
spikes may be determined and the reporductive stage where
number of grains per spike and grain weight may be affected.
Growth of wheat grain, from initiation to maturity, has the
more pronounced effect on the yield per unit area. During
such period, i.e. grain filling period, the potential
storage capacity of photosynthetes and their translocation
to the developing grains are considerably affected by the
environmental conditions prevailing during maturity period
among which are water and nutrient supply.
Water stress i.e. number of irrigations during the life
period of wheat plant may affect considerably the capacity
of the source to assimilate photosynthetes translocated to
the sink, i.e. developing grains through filling rate,
filling period and the effective period. Also, nitrogen
status in the tissues of wheat plant may prolong and