الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Biennial bearing, i.e., alternate yea1 cropping
of certQin fruit plants is a pr oblem of great economic
importance in commerical fruit gro .. ing orchards allover
the world. Trees ·,.hich ho.ve acquired this biennial
rhythm carry a heavy crop in one year (called the ” on”
year) and followed by a little or no crop in the next
(the ”off” year). The fruits of the ”on” year tend to
be overcrowded, small ana of poor qmlity while the few
fruits tho.t are formed in an ”off” yeQT <�.re usually
above normal size anu often relatively too large.
Biennio.l bearing has been reported by severo.l
workers in many Kinds of fruits. In A.R.E., it is
especially serious in mand<J.rin trees through it is also
serious in certain fruits of other tree species.
This work was origin:..lly conducted to evaluate
possible caues for the alternate bearing phenomenon.
This study m ay shed more light o n facing such phenomenon
from the academic ana applic:.ttion points of view. Thus,
the nutrit ional status of the ”Balady” mndarin tree
(macro & micro elements and charbohydrates), beside the
endogenous hormons content during th e period of flower
formation was studied.- 2 -
In addition, the effect of ringing and defoliation
of shoots and GA3 appliction on the flowering percentage
anu bearing behaviour was also investigated.