الفهرس 
Material and methodsOnly 14 pages are availabe for public view
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Abstract
The present investigation was carried out to study the effect of irrig.
treatment and N application time on growth, yield and its components and
protein content in maize grains cultivar Ftah cultivar.
Two field experiment were conducted at the Agricultural Research and
Experiment Center of the Faculty of Agrriculture Moshtohor, Kalubia , Egypt
in 1992 and 1994 seasons. Each experiment included four levels of irrgation
(200,300,400 and 500 m3 water Ifed for each irrig. in the first season,
250.300,350 and 400 m3 water Ifed in the second season) and nine
application times of nitogen fertilizer as follows :-
T1 = 1/3N at planting + 1/3N at 1 s t irrig. + 1/3 N at 2nd irrig.
T2 = 1/3N at planting + 1/3N at 1 s t irrig. + 1/3N at 3rd irrig.
T3 = 1/3 Nat 1 st irrig.+ 1/3 Nat 2 nd irrig. + 1/3 Nat 3rd irrig.
T4 = 1/2 N at planting + 1/2 N at 1 st irrig.
T5 = 1/2N at planting +112 N at 2 nd irrig.
T6 = 1/2 N at planting + 1/2N at 3 rd irrig.
T7 = 1/2 Nat 1 st irrig. + 1/2 Nat 2 nd irrig.
T8= 1/2 N at 1 st irrig. + 1/2N at 3 rd irrig.
T9 = 1/2N at 2 nd irrig. + 1/2N at 3rd irrig.
The treatments in the two growing seasons were arranged in split
plot design in four replications .The irrig. treatments were assigned at
random in the main plots whereas the sub plots were occupied at random
with nine times of nitrogen fertilizer application.Nitrogen was applied at a
rate of 105 kg NI fed., in from of ammonium nitrate (33.5% N). The area
of each plot was 10.5 m2 (11400fed). Planting dates were June 15 and
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Summary
88
7 in 1992 and 1994 seasons, respectively. Harvesting dates were on
october th and in the first and second seasons, respectively .
Characters studied:-
I Growth characters :-
1- Plant height (em)
2- Ear height (cm)
3- Stem diameter (nun)
4- Number of leaves per plant.
5- Time of tasseling.
6- Time of silking.
7-Ear leaf area (em”).
8- Chlorophyll content and carotenoids in the leaves after 90
days from planting.
II Yield and yield components :_
1- Percentage of lodged plants.
2- Percentage of barren plants.
3- Percentage of plants carried one ears.
4- Percentage of plants carried two ears.
5- Ear length (em).
6- Ear diameter (mm).
7- Number ofrows/ear.
8- Number of grains/row.
9- Number of grains/ear.
10- Ear weight (gm).
11- Weight of 100- grain.
12- Shelling percentage.
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Summary
89
I3-Biological yield (kg) fed..
14- grain yield (kg) Ifed.
15- Straw yield (kg) /fed.,
16- Protein content in grain.
17- Protein yield (kg) /fed..
The results could be summarized as follows :-
I Growth characters :-
A-Effect of irrigation treatments:-
1- Plant height, stem diameter and ear leaf area were
significantly increased by increasing the amount of water up to
400 m3 Ifed at every irrig. in the two growing seasons.
2- The heighest valueof ear height was recorded when
irrigated maize plants with 500 m3 water in the first season
and at 400 m3 water Ifed in the second season
3- Irrig. treatments had no significant effect on number of
leaves Iplant ,time of tasseling chlorophyll a and carotenoids
content.
4- The mean values of chlorophyll b significantly increased by
increasing the amount of water up to 300 m3 Ifed.
5- There was a significant delay time by decreasing the
amount of water .
B- Effect of N app6catioD time :-
1- Time of N: application significantly effected plant height
.ear height .stem diameter,time of siUongand ear leaf area . Early
addition of nitrogen fertilizer in the two or three equal doses
gave the highest wiues of growth characters.
Summary
90
2- Number of leaves/plant, time of tasseling and chorophyll
content in leaves of maize were not significantly effected by
different times of nitrogen application.
c- Interaction effect :-
1- The tallest plant was obtained from irrig. at 400 m3 waterwith
addition of nitrogen fertilizer(1/2 Nat 1 st irrig. + 1/2 N at 3 rd
irrig.or 1/2 N at 1st irrig. 1/2N at 2 nd irrig. or 1/2N at 2 nd
irrig +1/2 N at 3 rd irrig)
2- The highest ear position was obtained from irrig. with high
amount of water in both seasons with addition of nitogen
fertilizer in two equal doses starting from the 1st irrig..
3- Application of nirogen ferilizer in the two equal protions
(1/2 N at planting + 1/2N at 3 rd irrig. or 1/2N at 1 s t irrig.+
1/2N at 2 nd irrig.) gave the maximum stem diamter with
irrigated plants at 400 m3 waterlfed. .
4- Number of days to 50% siking was increased by decreasing the
amount of water and delaying addition of nitrogen fertilizer .
5- The largest area of ear leaf was obtained from adding 500 m
3
water Ifed. with addition of 1/2N at planting + 1/2N at 3 rd
irrig. in the first season. Whereas irrigated plants with 350 or
400 m3 water/fed with spliting nitrogen application (1/2 Nat
planting +112 Nat 1 st irrig.) gave the maximum ear leaf area in
the second season.
Summary
91
II Yield and yield components :-
A-Effect of irrig. treatment :-
_The precentage of lodged plants. plants carried one and two ears
were significantly increased by increasing the amount of water
Ifed in the first season only .Whereas in the second season. the
differences did not reach the 5% level of significance.
_The lowest percentage of barren was obtained from irrigated
plants at 400 m3 water/fed,
_Ear length ear diameter n~ber of rows lear .number of grains per row
and ear • ear weight .shelling % • biological yield .grain yield and
~’ -:’: ’
protein yield per fed. .yveresignificantly increased by increasing
water supply up to 40Qm3 /fed, in the first season and up to 350
m3 /fed, in the second season.
{:>
-Protein content in maize grains was significantly decreased by
increasing the amountof irrig..
B- Effect of N application time :-
_The perrentage of lodged plants. barran plants. carried one and two
ears were siginficant affected by different times ofN application
in one season only. The highest values of lodged plants. plants
corried one and two ears obtained from early addition of nitrogen
(112N at planting +1/2 N at 2nd irrig . )
_Times ofN fertilizer application significantly affected the ear
characters • 100 - grain weight. shelling percentage.
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Summary
92
biological yield, grain yield, straw yield, protein content and
protein yield in the two growing seasons.
3- Splitting the amount ofN fertilizer in two or three equal doses
applied at early stage gave the highest yield and yield
compoments .
4- Addition of nitrogenfetilizer in two equal portions at late stage
(112 N at 2ndirrig. + 1/2 Nat 3 rd irrig.) gave the maximum
protein content in mai~~ grains and protein yield Ifed. in
both season.
\
t·
!
ears.
c- Interaction effect :-
1- Early eddition of nitrogen fertilizer with increasing the amount
of water up to 400 m3lfed gave the lowest barren plants
percentage and highest percentage of plants carried one and two
2-The tallest ear was produced from irrigated plants with 400 m3
_
water/fed with esplitting application of nitrogen (1/2 N at
planting + 1/2N at 2nd irrig.) in the 1 st season. Whereas
addition nitrogen fertilizer in the three equal doses 1/3N at 1st
irrig. + 1/3N at 2nd irrig.+ 1/3 Nat 3 rd irrig. with applied
irrig. at 350 m3Jfed.gave the tallest ear in the 2nd
season.
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Summary
93
3- Addition of nitrogen fertilizer in the two equal portions (112N
at 2nd irrig.+1/2 Nat 3rd irrig.) with irrig. with 400 and 350
m3 water/fed. gave the maximum ear diameter in the Is t and
2nd seasons, respectively.
4- The highest number of rows I ear was produced from the
interaction between addition 1/2N at planting + 1/2 Nat 3rd
irrig. with the application of 400 m3 fed in the first season
and between addition 1/2 N at 1st irrig + 1/2N at 3rd irrig
with irrigation with 350 m3 / fed in the second season.
5- No significont diffemces were observed on number of grainsl
row by irrigation with 400 m3 , Ifed in the 2nd season with
different times of N- application.
6- The maximum number of grains per row and per ear were
obtained from addition 1/2N at planting + 1/2N at 2nd irrg .
with irrig. at 400 m3 I fed in the first season. Whil in the
2nd season, addition 1/2N at 1 st irrig + 1/2N at 3rd irrig with
applied 350 m3 water I fad gove the highest values.
8- 100 - grain weight was decreased by irrigated plants atlowor
high amount of water with different times ofN application.
7- Ear weight was increased by increasing the amount of waterup to
400 and 350 m3 I fad in the first and second seasons ,respectively
with addition 1/2N at 2 nd irrig + 1/2N at 3!”d irrig
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Summary
94
9- The highest shelling percentage was found fro~ addition ~ 1/3N
at planting + 1/3N at 1st irrig + 1/3 Nat 3rd irrig or 1/2N at
planting + 1/2N at 2nd irrig with application of 300 m3 water/
fed. in the 1st season and addition 1/2 N at plantsing + 1/2N
at 1st irrig with irrigated plants with 350 m3 water / fad in
the 2nd season.
10- The greatest grain and protein yield / fed. were produced from
addition 1/2 at 2nd irrig + 1/2 Nat 3 rd irrig with increasing
the amount of water up to 400 and 350 m3 / fed in the first
and second season respectively.
11- Protein content in maize grains was decreased by increasin
the amount of water with early addition of nitrogen fertilizer. .