الفهرس 
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Abstract
SUMMARY
Two field experiments were carried out at the Research
and Experimental Farm of the Faculty of Agriculture of
Moshtohor. Kalubia Governorate. Egypt. during 1990 and 1991
seasons to study the response of maize plants to skipping
irrigation and nitrogen fertilization as foliar application
on growth. yield and yield components and chemical properties
of maize grains. Each experiment included 20 treatments
which were the combination of 4 treatments of irrigation
(At- irrigation every 14 days, A2- irrigation every 14 days.
skipping 4th irrigation and A3- irrigation every 14 days and
skipping 6~h irrigation and A4- skipping 4th and 6th irrigations
together) and 5 levels of nitorgen as foliar application
at flowering stage (0.0. 5.52. 11.04. 16.56 and 22.08
kg N/faddan). The nitrogen was applied in a form of urea (46
~ N). The treatments in the two seasons were arranged in
split plot design with four replications. The main plots
were devoted to the irrigation treatments and the nitorgen
fertilizer levels occupied the sub- plots. The area of each
sub- plot was 10.5 m2 (3.5 x 3 m) 1/400 faddan contained 5
ridges which were 70 em apart and 3.0 m length. The distance
between hills were 30 cm apart. The outer two rows (1~ and
5th) were considered as border rows. The vegetative samples
were taken from 2rd row to determine the dry matter and
growth measurements. The grain and straw yields and yield
components were taken fromn five rows of each plot. which
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equal to 10.5 m2 and calculated per faddan (4200 m
2
). The
phosphorus fertilizer was applied at level of 32 kg P20~ per
faddan in a from of calcium super-phosphate (16 ~ P20S) to
all treatments before sowing time. Every treatment received
105 kg Nj faddan. splited into two parts. The first dose was
applied just before the first irrigation. the second part
was added before the second irrigation. The nit- rog
en
fertilizer was applied in a form of ammonium nitrate (33.5 ~
N) •
Characters studied:
1- Growth measurements:
The following data were recorded for determining charqcters
of 10 plants (chosen at random for each treatment of
every replication at 95 days from sowing during the two successive
seasons of the experiment to estimate the following
characters :
1- Plant height in cm.
2- Ear height in cm.
3- stem diameter in cm.
4- Number of green leaves per·plant.
5- Leaf area index.
6- Total dry weight per plant in gm.
7- Time of 50 ~ tasseling per days.
B- Time of 50 ’I. silking per dayS.
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11- Yield and yield components
1- Ear length in em.
2- Ear diameter in em.
3- Number of rows per ear.
4- Number of grains per row.
5- Number of grains per ear.
6- 100- grain weight in gm.
7- Grain weight per ear in gm.
8- Shelling percentage .
9- Grain yield ardab per faddan.
10- Straw yield ton per faddan.
111- Chemical properties:
1- Crude protein percentage.
2- Protein yield (kg/ faddan).
The following are the most important results
r- Growth measurements:
A- Effect of the irrigation treatments : (A)
The plant height and leaf area index at 95 days from
sowing, ear height, number of green leaves per plant, total
dry weight, time of 50 ~ tasseling and silking were significantly
affected by the irrigation treatments in the combined
analysis of the two seasons.
The highest values of the plant height, ear height,
number of green leaves and leaf area index at 95 days were
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obtained when received the all irrigations. However. the
highest values of the time of 50 ~ silking were obtained
when skipping the 4th and 6th irrigations. whereas the time
of 50 ~ tasseling was obtained when skipping the fourth
irrigation.
The stem diameter was not significantly affected by
the irrigation treatments in the combined analysis of the
two seasons.
B- Effect of the nitro en foliar a lication: B
The plant height at 95 days. ear height. number of
green leaves. time of 50 ~ tasseling and total dry weight at
95 days. time of silking were significantly affected by the
nitrogen fertilizer levels as foliar application in the combined
analysis of the two seasons.
The highest values of the plant height at 95 days. ear
height. numbr of green leaves, time of 50 $ tasseling and
total dry weight at 95 days. ear height and time of 50~
silking were obtained when applied 22.08 kg Nt faddan level.
The stem diameter and leaf area index were not significantly
affected by the nitrogen levels as foliar application
in the combined analysis of the two seasons.
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.B- Eff~ct of the nitrog~~ foliar application: (B)
The ear length. number of grains per row, number of
grain per ear and 100- grains weight were significantly affected
by the nitrogen fertilizer levels as foliar application
in the combined analysis of the two seasons.
The highest values of the ear length. number of grain
per row, 100- grains weight and numbr of grains per ear were
obtained at 22.08 kg N/ faddan level. whereas the 100-grains
weight was obtained at 16.56 kg NI faddan.
The differences between the averages of ear diameter.
number of rows per ear, grain weight per ear, as well as
shelling percentage were not significant as affected by the
nitrogen levels as foliar application in the combined
analysis of the two seasons.
The grain yield ardab per faddan was significantly
affected by the nitrogen foliar application levels in the
two seasons as well as in the combined analysis of the two
seasons.
The highest value of the grain yield was obtained at
22.08 kg NI faddan (Bs) in the combined analysis of the two
seasons.
The straw yield was not significantly affected in two
seasons as well as in the combined analysis of the two
seasons.
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c- Effect of the interaction: CAB)
The ear length. ear diameter. number of rows per ear.
numbr of grains per row and per ear. 100- grain weight.
grain weight per ear and shelling percentage were not significantly
affected by the interaction between the irrigation
treatments and the nitrogen fertilizer as foliar application
in the combined analysis of the two seasons.
The differences between the average of grain yield
was significant in two seasons as well as in the combined
analysis of the two seasons due to the interaction between
the irrigation treatments and the nitrogen foliar application.
The highest value of the grain yield per faddan was
obtained when received the all irrigations with 22.08 kg N/
faddan (B5). whereas the lowest one was obtained when
skipping the 4th and 6th irrigation with unferti1izer treatment.
The straw yield per faddan was not significantly
affected in the combined analysis of the two seasons due to
the interaction between the irrigation treatments and the
nitrogen fertilizer as foliar application.
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111- Chemical properties:
A- Effect of the irrigation treatments : CA)
The differences between the averages of crude protein
and protein yield (kg/ faddan), were significant as affected
by the irrigation treatments in the combined analysis of the
two seasons.
The highest value of crude protein percentage and protein
yield (kg! fad.) were obtained when received the all
irrigations (Ai).
B- Effect of the nitrogen foliar application :(B)
The crude protein percentage and protein yield (kg!
fad.) were significantly affected by the nitrogen levels as
foliar application in the combined analysis of the two
seasons.
The crude protein percentage and protein yield (kg/
fad.) increased by increasing the nitrogen levels as foliar
application .
The highest value of crude protein percentage and protein
yield (kg! fad.) were obtained when received 22.08 kg
N/ faddan.
c- Effect of the interaction: (AB)
The differences between the average crude protein was
not significant due to the interaction between the irrigation
treatments and the nitrogen fertilizer levels as foliar
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application in the combined analysis of the two seasons. On
the other hand the differences of protein yield significantly
affected by the interaction between irrigation treatments
and nitrogen foliar application in the combined analysis of
two seasons. The highest value was 345.55 kg/ fad. when
received the all irrigations with 22.08 kg N/ fad. as foliar
application.