الفهرس 
Material and methodsOnly 14 pages are availabe for public view
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Abstract
6·TII’JO field experiments were conducted. at the
Research and Experimental Station of the Faculty of
Agriculture at Moshtohor, Zagazi09Unlverslty in the two
success ive 9 rowing seasons of 1981 and 1982.
SolI texture of the experimental plots was clay,
with pH value of 7.9 and an organic matter content of 2%
and containing 5.0 ppm Zn snd 11.6 ppm Mn.
The objective of this study is to find out the
effect of two growth regulators (GA3 and lAA) at two
concentrations (20 and 40 ppm) with or without Zn, Mn or
Zn+Mn at 0.5% level in the spray solution of each of these
micro-nutrients on the gn)wth. quantitative and qualitative
characters of maize plants.
The commercial distributed double hybrid maize
cultivar Pioneer 51. was used in this study.
fertilizer was applied at a rate of 90 kg/fed.
Nitrogen
The applied treatments, war,e:
A. Micro-nutrients:
1. Distilled water to represent the control.
2. ZnS04 0.6%
3. MoSO. 0.61
4. ZnS04 + MnS04 each l!t’t 0 .•6%
B. Growth regulato rs :
1. Distilled water to represent the control.
2. GA3 - 20 ppm
3. GA3 - 40 ppm
4. IAA - 20 ppm
5. IAA - 40 ppm
The experiments were designed ~n a complete
randomized block design with four replicates. Plants
we re sp rayed twice with the growth regulato rs a fte r 30
and 55 dave from planting. VA111e micronutrients were
sprayed once which was 10 days after the first spray
with growth regulators (40 days from planting). Plants
wore sp rayed with dist illed wa te r fa r the cont rol
tr~atment,
The main results could be summarized as follows:
1. The application of GA3 at 40 ppm and lAA at 20 ppm
delayed time of tasseling, while GA3 at 20 ppm induced
earlier tasseling than lAA at the same concentration.
Applied Zn produced a significant earlines6 in
tasseling then the control by 0.70 end 1.16 days froa
plant!ag in ~he first and 8econd growing S88S0ns
respectively.
2. Growth regulators showed no significant effect on
silking date 10 the both seasons. On the other hand,
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(( micronutrient effected on silking date in the first
season. Zn reduced silking by 0.65 days then the
con t roL;l’’ v ’(’
3. Plant height of maize was significantly affected by
)} the growth regulators and micronutrients application.
GA3 at 40 ppm significantly produced the tallest
plants than 0 ther 9 rowth regula tors , Whe reas I the
shortest plants were obtained by the application of
lAA at 20 and 40 ppm in the two studied seasons respectively.
The application of Mn at 0.6% significantly
increased the plant heights of maize than with 0, Zn
and Zn+Mn respectively in the two growing seasons.
4.,Earheight was significantly affected by the application
of growth regulators in both the studied seasons.
The application of GA3 at 40 ppm produced the highest
ear position. The effect of micro-nutrients on the
ear position was significant in the first sesson only.
The application of Zn and Mn produced significantly
higher ear posi~1on then the control.
5. The effect of growth regulators on stell diameter was
significant on!y in the second season. The appliestion
of lAA at 20 pp. significantly produced thicker
plants than G~ at 20 end 40 ppll.
The applied of aicronutrients insignificantly increased
8tea di ••• ter 0 f lle1ze plants than the control.
.• 71
6. Leaf area was significantly affected by the applied
growth regulators only in the first season. Leaf area
decreased by GA3 application with a significant
difference at 40 ppm. However leaf area was slightly
increased by applying lAA at 20 and 40 ppm as compared
to the control and GA3 without any significant
..y
Jdifference. L.af area significantly increased by
applying Zn as compared to the control in the first
season. The interaction between the applied growth
regulators and m1cronutrients on the leaf area was
significant in the first season. The highest leaf
area was produced by applying Zn+Mnwithout growth
},I/ regulators •. v v
7. Ear length and diameter were not significantly
affected by the applied growth regulators or micronutrients
in the two successive seasons.
8. The effect of the applied growth regulators end mlcronulrients
snd their interaction were not significant on
the nullber 0 f rows pe r 88 r in the two 9 rowing seasons.
9. Number 0 f gre ins per ea r d1d not respond signj.f1cantly
to any of the applied growth regulators or the lIicronutrients
1n the two seasons.
10. There was • ~fic8nt eff.ct of the applied growth
re9u~.tDrs on~he nu~er of ears per plant in the first
9row~ season. But GA3 a. 1M at «> pp. significantly
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increased the number of ears per plant as compared
to the control. Also the effect of micronutrients on
the number of ears per plant was significent in the
first season. Zn 0 r Mn application produced lower
number of ears per plant than the control.
11. Ear weight was not significantly affected by either
the growth regulato rs 0 r roicranut rients in the two
growing seaso ns •
12. Grain weight per ear was significantly affected by
the applied growth regulators and micronutrients in
~ second growing season. The application of lAA at
20 ppm 6ign~ficantly increased the average grain weight
per ear then the contn)! in the second season. However,
the lAA at 40 ppm significantly decreased the grain
wetgh.t pe r ee r than the lower level 0 f 20 ppm.
Also, the averagegraln weight per ear was significantly
effected by micronutr1ents application of Zn and Mn
either elone or together produced lower grain weight
per ear as collpsred to the control. The interaction
effect of the growth regulators and Micronutrlents
was significant in the second season only. The highest
grain weight per ear IISS obtained by applying lAA at
4D ppm without .1cronutrients.
13. Shelling percentage was not significantly affected
by the application of growth regulators and .1cronur
r1.ents 1.n bo th the 9rowing seaeons.
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14. We19ht :Q}; 1.90 kernels was, significantly affected by
th~. appLac e t aon o:f- growt,h regul~tors and micrnutrients . . . ,.” - .
in the firDt season only. The application of GA3 at
20 PP.~,p,”:o,duced the ~,ighest weight of lOP kernels •.
Applying manganese alone produced h.igher lOO”,:”kernel • _ .: : ••’ .’ • L •
weight than applying Zn+Mn toge,t.her.. Significantly
higher weight c.f 100 kernels was obt aane d. by applying
GA
3 at 20 ppJ1l wi tho ut mic r,o.nut. r ien~s app 1 aca tion in
the first season.
15. Grain, weigh,t per pl~Dt was not s19nific.antly effected
b,y t;h,e gr()wth ~~9culators application in the fir$t and
s~cond gr~wing 6eas9n~ The aR~licat1on ~f lAA at 40
ppm prod~c.~d h~gh~r grain weight p,~r plant 1n the
jirs~ 888$On ~han the ~~~~rql~ The appl~c,~~~n of
ei~her Z~ ~r Zn+Mn together ~~gn1f1pantly pr9du~ed ~ .< - .” ’.’ _. , • •
~ower g~1n weight ~er pl~nt. in th~ se~ond growing
seeson than the cQntrol. The inter.action between . . -- ’. ’;. ..!.’ ! ~ . - ;’.;’: ’
_~~ron~trien~s ~nd gnow~h r.eg~latQrs was significant . - -.’ . . . ,. . ’.
~11 the sec.ond growirag S8$1sqn only, and the .,19hest - ~., .~ _.’. . -.” .
~r~~nwe~gh~ per plant was pr~d~C~~ b~ applylng GA3
at 4Q pp. w~!hg~~~~y of ~h~ app~~ed micronutr~e~t
t~atments!
16~ There was no s~nifl~ant effecF pf the epp118~
_icrnnutrients .nd growth reg~~8to~s on the grain ”- ’. .•... - .
y 1~J.ds pe rf.~. n 1n the ,two ~t~dJ.ed seasons. The ,~- .’.” - . ’- . -. ’;.- .... . . .
74
application of lAA at 40 ppm produced the highest
grain yields per faddan (2975 kg/fa) over the application
of GA3 at 20 ppm, GA3 at 40 ppm, lAA at 20 ppm
and the control which were 2805, 2935# 2880 and 2905
kg/fa in the first growing season respectively, being
3595, 3600# 3615 and 3635 kg/fa. in the second growing
season. Also, the highest grain yield was obtained by
the application of IAA at 40 ppm (3675 kg/fa) in the
second growing season. The highest grain yields were
obta~ned by applying Mn in the first season and Zn in
the second growing season whereas the grain yields
were 2948 and 3672 kg/fa. respectively. The interac
t aon of growth regulators and micronutrients on the
grain yield. was not significant in both of the
cultivated seasons.
l~ Results of the effect of the applied m1c~nutrients
end growth regulators on the nitrogen, phosphorus,
~
pots8siu., zinc snd ••ngenes. con~.nt8 of .size leaves
and ke~nels was not s-ignificant 1n the two studied
seasons. )1
(r
18. Further studies are suggested for us1ng higher concentrations
of lIicronutr1ents and growth regulators to be
applied earlier.