الفهرس 
Material and methodsOnly 14 pages are availabe for public view
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Abstract
Two field experiments were conducted at Agricultural
Experiment Farm. Mallawy Research Station in 1991/ 1992 for
cane crop and 1992/ 1993 for first ratoon. The ailTIof this study
was to observe the effect of N sources, application time and
levels on growth, yield and its components and juice quality of
sugar cane variety G- T 54- 9.
Split- split plot design with three replications were applied.
Nitrogen sources i. e. ammonium sulphate, ammonium nitrate,
urea and slow release fertilizer were ranked the main plot. Two
application times as all amount after planting or the half after
complete germination and the other half after one month from
first dose occupied in sub plot. Nitrogen levels (zero, 80, 160
and 240 kg N/ fed.) were distributed in sub- sub plots. Planting
was done on March 12, 1991 using the dry method.
The results could be summarized as follows:
A. Growth characters
1- Ammonium nitrate gave the highest number of plants/ m.
Adding nitrogen fertilizer at two equal doses produced
the highest number of plants/m. The highest number of
plants/ m was obtained by using N fertilizer at 160 kg N/
fed.
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2- The tallest plant was obtained by usmg urea as when
compared with the other sources. The application of
nitrogen fertilization at one dose after planting gave the
highest plant. Plant height was increased as nitrogen level
was increased up to 240 kg N/ fed. at 180, 2 I0 and 240
days age.
3- The total soluble solids at 9 and 10 months ages were
increased when using urea, while slow release fertilizer gave
the highest total soluble solids at age 11 monthes. Adding
all amount of nitrogen at planting resulting in giving the
highest total soluble solids during growth stage.
The total soluble solids increased by increasing the
nitrogen levels. But the differences between the averages
were not significant except at 11 month age.
B- yield and its component characters
1- Slow release fertilizer was better than other sources as for
millable cane length. The nitrogen application time resulted
in increasing significantly the millable cane length.
Fertilization sugar cane by nitrogen in two equal doses gave
the highest millable cane length. There was a significant
Increase in this trait as N level increased up to 160 kg N/
fed.
2- The stalk diameter was not significantly affected by nitrogen
sources, application time and nitrogen levels.
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3- The number of internodes/ stalk was significantly affected by
nitrogen sources. Fertilization sugar cane by ammonium
nitrate or urea tended to produce more internodes. Time of
N fertilization did not affect significantly the number of
internodes. The number of internodes/ stalk was increased
as nitrogen levels were increased up to 240 kg N/ fed.
4- The stalk weight was significantly affected by nitrogen
sources and levels, while time of application did nit show
any significance effect on this trait. Using urea at 240 kg Nt
fed. gave the highest stalk weight.
5- Net cane yield (toni fed.) was significantly affected by
nitrogen sources, time of application and nitrogen levels.
The highest cane yield was obtained when received 240 kg
N/ fed.· of slow release fertilizer in two equal doses and
when received 160 kg N/ fed. in one dose but the difference
was not significant.
6- Juice weight / stalk (kg) increased by using ammonium
nitrate when compared with the other N sources, however
time of application and nitrogen levels did not significantly
affect this character.
7- Both time of application and nitrogen levels had significant
effect on sugar yield/ fed. However, this trait was not
significantly affected by N sources. The highest sugar yield
was produced by slow release fertilizer at 160 kg N/ fed. in
one dose.
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C: Juice characteristics
1- Total soluble solids (T.S.S) was not significantly affected by
the three factors under study.
2- The sucrose percentage was not significantly affected by
nitrogen sources or time of application. However, nitrogen
levels showed significant effect on sucrose percentage. The
highest value of sucrose % was obtained by applying 240 kg
N/ fed. in a form of urea at one dose but there was no
difference by slow release fertilizer when applying 160 kg
N/ fed. in one dose.
3- The purity percentage was significantly affected by nitrogen
sources. Ammonium sulphate improved purity of cane juice
when compared with the other sources. However, neither
time of application nor levels of nitrogen had significant
effect on purity percentage.
4- The three studied factors did not have any significant effect
on reducing sugars.