الفهرس 
Material and methodsOnly 14 pages are availabe for public view
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Abstract
sUMIIARY
~he 1nve,stigation included two studies 1.e. the f~ret one
waS field experiment , whereas the second study waS carrled out
in pots •
Pirst study
Two field experiments were performed in the Agricultural
Experimental station of the National Research Center at Shalakan
, Kalubla Governorate during 1983 and 1984 seaSons to inveetigate
the effect of nitrogen and phosphorus fertilization
on growth , yield and its components , and chemical contents
of soybean calland cultlvar • The levels of nitrogen fertilization
were , zero ,20,40,60,80,100 and 120 Kg N/feddan t and
the levels of phosphorus fertilization were , zero,30 and 60
Kg p205’teddan -I... split-plot design with six repllcatiOD$ waS
used. The nitrogen lev•.•• occupied the main plots, whereas
I:
the phosphorus levels represented as 8ub-plot treatments •
Ten .plants were taken a8 random at 55,76 and 91 days after
so;,J.Dg to take the 4ata ot growth _asurements •
1- Growth measuremen’t.I-
1- Plant height (em).
2- .umber ot branches/plant.
3- Number ot ~eaves/plant. 4- Number or f1owers/pl~t •
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5-Number of podfJ/plant. 6~ry weight ot stems 1n g. Jplant.
7-Dry we1ght of leaves 1B gjplant •
a-Dry weight of peds in g /plaut •
9-Leat area(L_A~”cm2~. lQ-Leat area index (L.A.I~”cm2/cm2 ••
11-8pecitlc leat weight (S.L.WJ ”rng/em2n_
12-5pecltlc leat area! (S_L.A~ ”em2/~” •
At maturity” ten plan:ts were taken at random tram the three
middle ridges to take the data ot yield components, whereas the
seed and straw yield were calculated from the :yield of whole
plots •
11- Yie ld and yieId components :-
1- Plant height ”em” • 2- Humber of branches/plant •
J- Humber or pods/plant. 4- Humber ot seeds/pod •
5- Humber ot seeds/plant. 6- Weight ot pod ”g.~ •
7- Weight ot seeds 1n g’ IpOd. 8- Weight ot seeds in g: Jplant.
9- Weight ot 100 seeds ”g’w. 10- Seed yield in ”ton /teddan”.
ll-5traw yield in ”ton .Iteddan”.
111- Chemical contents a-
I-Photosynthetic pigmente. 2-B1trosen percentage.
J-Phosphorus percentage. 4-011 percentage •
5-Crude protein percentage waS calculated by multiplying nitrogen
content by 6.25.
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6- 011 yield ”kg/feddan” (calculated by multiplying 011 percentage
by seed yield/teddan) •
7- Protein yield ”Kg/ledden” (calculated by multiplying protein
percentage by seed yleld/feddan) •
The important results were summarized as follows •
1- Growth .Characters
A- The effect of nitrogen fertilizer levels :-
1- There waB a significant differences between the averages of
number of leaves/plant and dry weight of leaves/plant when
the nitrogen levels increased up to 100 Kg/feddatt, at 55
days after sowing •
2- The nitrogen fertilization resulted in increasing slgnirlcantly
.the number o~ flowers/plant as well as the Dumber ot
,
pods/plant when recelyed 80 Kg B/f’eddan, at 76 da)’B after
~
sowiDg •
J- The dry weight ot pod8/plant became great by increasing the
nl trogen level up to 100 Kg/redden, at 76 days afier sow1.Dg.
4- At 97 days atter sent_ , the nuaber o:r pods/plant and dry
weight ot pods/pl811t:ttere affected 81gniticant17 when received
100 Kg X/ledd” •
5- The differences between the averages of leaf area (L.A~ ,
..- .- .- -_. _.- ----
---+--._-- .
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leaf area index (L.A.IJ and specific leat area (5.L.A~ were
significant due to the level of nitrogen 120 Kg I/
fedden , at 55 days after sowing •
6- There was·s significant increase in leaf area (L.A~,leaf
area index (L.A.IJ , and specific leaf area (S.L.AJ when
nitrogen was added at the rate of 60 Kg/feddan, at 76 days
atter sowing as compared with the control.
7- There was insignificant effect for nitrogen fertilization
on leat area (L.A~ , leaf area index (L.A.IJ and specific
leaf area {S.L.A~ , at 97 days after sowing •
B- The effect of phosphorus fertilizer le-vela :-
1- The phosphorus had no significant effect on the plant height,
number of branches, leaves, flowers, and pods/plant, dry
weight of stemli1alnd leaves of soybean plant at 55, 76 and
97 days after sowing • Similar trend was also achieved concernniDg
dr1 weight ot pods/plant • at 76 and 97 days after
sowillg •
2- Application of phosphorus exhibited insignificant etfect an
leat area (L.AJ, leat .rea 1Ddex (L.A.I~ • specific leaf
weight (S.L~.~ t and .,.elfte lea.t area (S.L •.A~at 55 am!
97 days after sowing .,:ft.ere was a significant decrease in
leaf area index· (L.A~I.), .at 76 days after sowing by increasing
the phosphorus level •
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c- The effect ot 1nterac~lon t-
There waS a signlticsnt etfect on number ot pods/plant
due to the interaction between nitrogen and phosphorus tertilizers
t at 55 and 97 days after sowing •
11- Yield and yield icompanents
i
A- The effect of nitrogen ferti1izerlavels t-
1- The nitrogen resulted in increasing significantly the weight
of pod and weight of seeds/pod •
2- Weight of seeds/plant and seed index reached their peaks
when received nitrogen fertilizer up to 100 Kg/feddan •
3- There waS a tendency to insignificant increase in plant height
• number of pods/plant ,and number of seeds/plant with
increasing nitrogen leTe~ •
4- Seed yield of soybean as well as straw yield increased signlflcantly
up to the highest level. of applied nltrogen t and
this was true tor different years and the combined analysis
except straw yield in 1984
• ;~._ ••• ;”’L_~ __J”” _L •
B- The eftect of phosphO~ fertiliser ’levels 1-
- f.; ~-;;:d>
1- Phosphorus 1evels shoiiled 1nslpiflcdt etfect cOIlcernniDg
dll’l’orca.’t ;r1e1d compceen1:s o~ Boybeall p1ant at time harvest.
---~- -- ---- ----~-------’--~~~~~~~~-----~ --+--~~---
..:;
.~~
-s: .s
2- Seed yield ot soybean reached the significant level at 5~
in 1983 seaSon a8 well as the combined anal1Sis • The h1ghest
seed yield was obtained with 30 Kg P205/feddan •
c- The etfect ot interaction 1-
The interaction of nitrogen and phosphorus on seed yield
was significant • The highest seed y1eld (1.900ton/feddsn)
was achieved under 120 Kg N and 60 Kg P20S/feddan •
111- Chemical contents
A- The effect ot nitrogen fertilizer~eve1s :-
1- Chlorophyll ”a” in soybean leaves increased gradually and
significantly with increasing nitrogen up to 120 Kg/teddant
at 55 and 76 days after sowing •
2- Carotenoides became great as nitrogen level increased up
to 120,100 and 80 Kg Blteddan tor 55,76 and 97 days atter
Bowing respectively •
3- Chlorophyll nb” reached 1ts maxiamm value when nitrogen was
applied at the rate ot 80 Kg/feddan •
4- There was insignificant difterences between the averages
of ni trag en and pho~ percentage in stems alltl pods ot
soybean plant owing to n1 tragen application •
5- Phosphorus percentage in leaves trended to decrease significantly
by increasing n1 trogen level •
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6. Thehlghest values ot all percentage and protein percentage
in soybean seeds were detected at 40 and 80 Kg X/tedden •
Furthermore the nitrogen resulted 1n decreasing these values.
7- There waS a significant and gradually increase in oil yield
as well as protein yield Kg/teddan when received 120 Kg W/
f’eddan •
B- The effect of phosphorus fertilizer levels 1-
1- Different photosynthetic pigments showed insignificant trend
owing to different leveleof phosphorus •
2- The nitrogen and phosphorus percentage in stems leaves and
pods of soybean were not affected due to phosphorus applicatien
•
3- The oil and protein percentage in seeds of soybean were not
significantly affected due to application of phosphorus •
4- The highest value ot 011 7ie1d was 343.1 Kg/feddan and protein
yield was 517.9 Kg/fedden, obtained trom 30 Kg P205 /
teddan •
c- The eftect ot interaction 1-
1- The differences betw.. the averages of chlorophyll If a” and
carotenoldes were sila1flcant due to the interactian between
N % P ~.rti1i~atlOD.~ 76 dayS atter sowing •
--- -- -- -~._-’- ---_._--” ”,--
·’..’. ,~’.’ . .:. .....
118 .;-,-.,’ .•••- ,._ -,’”__ _”.t,’. ~ ”,:-.,. ...~,
. .,.
achieved with eo Kg •
--’. maximumvalue with 100 Kg B tu19. 60 Kg P205/teddan.
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