الفهرس 
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Abstract
The present study was carried out 011 ()pIJllIJU Fir.:lls-indicll and
Agave sisalana (Both arc xcrophyts) to get some clue information
about the following objecti yes:
A) Improving the seedling emergence of O. Ficus indica by
controlling its seed dormancy by using specific growth regulators,
growth co-factors,. moisture-cold stratification, scarification by
concentrated H2S04, and seed subjection under thermal alternation.
B) Growth behaviour of cladode, flowering, and fruit
development of O. Ficus indica.
e) Effect of some growth regulators on fruit growth and
development of O. Ficus indica.
D) Effect of different NxK rates on specific available mineral
accumlations and nitrate reductase activity of Agal’c sisal ana
Perine, seedlings.
To approach the aim of this investigation. series of studies were
carried out during the periods extended from 1992 till 1994,
improving the seedlings emergence of O. Ficus indica experiments
were carried out under the green house of Desert R,esearch Center,
Cairo. Also. the experiment of Agave sisalana nutrients uptake was
carried out on the same Center, while other experiments on the
\ growth pattern of cladodes or fruits were carried out in many
locations.
The following results may be summarized as follows:
A) Improving the seedling emergence of O. Ficus indica.
1- The highest germination percentage and index were gained
when seeds of O. FICUS indica soaked in mixture of L ppm,
NAA + 2 ppm BA + 5 ppm GAJ
2- All treatments with growth co-factors increased significantly
the net gain of O. Ficus indica seedling emergence.
3- The highest stimulatory effect on seedling emergence was
gained by:
a) The application of 1 ppm AA alone or by GA3 + SA (5+ I
ppm) without AA.
. b) When seeds were exposed to moist-cold stratification
for nine days only. this stimulatory effect decreased
with increasing the time of stratification.
c) Externally supplement by I ppm AA + 1 ppm colchicin
+ hydrolytic enzymes.
d) When seeds were soaked in KN03 solution containing
30 ppm followed by 5 ppm IAA.
B) Growth behaviour of cladode, flowering. and fruit development
of O. Ficus-indica.
1- The juvenile cladode reached fan expansion after 33
days, also, length and width reach the maximum after 3 1 days
from the beginning’ of bud stage.
2- The best growth and higher cladode formation was
gained under Maryut conditions than under Ras Sudr.
3- The plant gave two waves of flowering and fruiting under
Maryut conditions, while under Matariya conditions it gave
only one wave of flowering and fruiting.
4- The fruit development of O. Ficus indica look about
104 days from the instillation of flowering but . till full
narvcstabte maturity.
C) Effect of some growth regulators on fruit growth and
development of O. Ficus-indica:
1- Painting GA.~ or NAA affected slightly fruit growth parameters
of O. Ficus-indica.
2- Injection of GA3 or NAA and 8A affected on fruit growth
parameters of O. Ficus-indica were gave the following results:
a) The highest stimulatory effect on fruit length and fruit fresh
weight was gained when used 50 ppm GA3 in the presence
of 25 ppm 8A and 0.0 ppm NAA.
b). The highest proportion of fleshy edible portion was
obtained by using 50 ppm GA3 + 100 ppm NAA + 0.0 ppm
SA.
c) The formation of mature seeds per one fruit decreased
significantly under 100 ppm GA3 and 100 ppm NAA. This
decrement increased with increasing their used rate, while,
SA stimulated the seeds formntion.
d) There are negative correlation between seed number and
100 seed weight.
e) The high concentration (accumulation) of ascorbic acid and
fruit pigments were gained when plants treated with highest
concentrations of NAA and GA3 when applied alone or
when they used the three substances as combined treatment.
D) Effect of different NxK rates onspecific available mineral
accumulations and nitrate reductase activity of Agave
sisalana Prine, seedlings:
1- The dominant form of available inorganic nitrogen in both
tested seedling part was always the nitrate-No
2- K play apart in the accumulation of nitrate-ammonia-N.
3- K concentration mostly decreased with increasing N level.
4- The main dominant available cation in A. sisalana seedling
was N a followed by K. 1\1g. Fe, 7.11 and Mu
5- N application minimized the available Mg cocncntration
whi lc the moderate of K stimulated slightly.
6- The moderate N or K stimulated the accumulation of
available Fe.