الفهرس 
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Abstract
Summary
Two pot experiments were conducted to study the effect of Padded
alone or combined with either molybdenum or boron beside the control on
growth, nodules formation and contents of N, P and Mo or B in soybean
plants.
Surface soil samples (O--15cm) collected from EL- Sharkeia (alluvial),
Burg EL- Arab (calcareous) and Inshas (sandy) beside man made soil
(mixture of sandy +clayey at ratio of 5:1) were used to perform this study .
The results obtained can be summarized as follows :
A: Effect of P combined with or without Mo on soybean plants grown
on alluvial and calcareous soils.
Application of P alone or combined with Mo significantly increased
the dry matter yield of soybean plant , number of nodules and its contents of
N, P and Mo.The effect of P was more pronounced when P was combined
with Mo.
Average values of nodules increased from 13 and 10 nodules I pot in
the absence of Mo to 18 and 14 noduleslpot with 5ppm Mo and 25 and 17
nodules/pot with 10 ppm Mo in the alluvial and calcareous soils,respectively.
The greatest number of nodules was produced when plants fertilized with 60
kg P/fed.and 10 ppm Mo.
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Uptake of Mo,N and P increased due to increasing the rate of applied
P alone or when combined with Mo .Average values ofMo, N, and P uptake
in the absence ofMo were 0,48 and 0.4 ug Molpot , 86.3 and 45.7 mg N/pot
and 21.4 and 9.5 mg Plpot in the alluvial and calcareous soils,respectively.
These values increased to 1.4 and 1.2 ug Mol pot, U5.8 and 50 mg N fpot
and 27 and 13.6 mg P/pot with 5 ppm Mo in the same soils, respectively.
Upon application of 10 ppm Mo, these values increased to 1.9 and 1.5 ug
Molpot, 131 and 63.9 mg N/pot and and 32 and 16.9 mg Plpot for the
abovementioned soils, respectively .
B: Effect of P combined with or without Mo on so bean
a sandy and a mixture of the sandy + clayey soils.
Increasing the rate of both P and Mo increased growth of soybean,
nodules formation and soybean contents of Mo, N and P.
Dry matter yield of soybean increased from 3.05 and 3.91 g/ pot in the
absence of Mo to 3.85 and 6.41 g/pot with 5ppm Mo and 5.98 and 7.49
g/pot at 10ppm Mo in the sandy and the mixture of sandy + clayey soils ,
respectively .
Number of nodules on soybean roots increased with increasing the rate
of applied P or Mo and the highest value was obtained when 60kg P/fed.was
combined with 10 ppm Mo.
Average values of nodules number increased from 11and 15 nodules/
pot in the absence of Mo to 14 and 18 nodules/pot at a rate of 5ppm Mo and
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17 and 23nodules/pot upon application of 10ppm Mo in the sandy and the
mixture of sandy + clayey soils, respectively .
Contents of Mo, N and P in soybean plants increased with application
of either P or Mo alone or both together .
Average values of Mo,N and P in soybean without Mo-fertilizer were
0.26 and 0.34 ug Mol pot, 19. 17 and 26.35 mg N/pot and 6.07 and 7.08 mg
P Ipot in the sandy and the mixture of sandy + clayey soils, respectively. With
increasing the rate of applied Mo to 5ppm,contents of Mo , N and P in
soybean reached 0.99 and 1.12 ug Mo/pot, 27.87 and 42.43 mg N/pot and
7.87 and 9.71 mg Pipet in the sandy and the mixture of sandy + clayey,
soils,respectively.These values upon application of 10 ppm Mo were 1.35 and
1.58 ug Me Ipot ,39.05 and 46.21 mg N/pot and 11.78 and 14.68 mg Plpot
for the abovementioned soils, respectively.
2- Effect ofP combined with or without B on soybean growth ,nodules
formation, and their contents of B, Nand P.
Application of either P or B alone or P combined with B increased dry
matter yield, number of nodules! pot and B, N and Pcontents of soybean
grown on both alluvial and calcareous soils .
In the absence of B,average values of dry matter were 7.82 and 4.59
g1pot.These values reached the maximum (11.48 and 6.10glpot) when P was
combined with 2 ppm B and then decreased to 9.16 and 5.12 g1pot when P
was combined with 6ppm B in the alluvial and calcareous soils, respectively.
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Number of nodules increased from 13 and 10 nodules /pot to 22and 17
nodules/pot then up to 16 and 13 nodules /pot with increasing the rate of
applied B from 0, 2 to 6 ppm B, in the alluvial and calcareous soils,
respectively.
The highest dry matter yield and number of nodules were obtained
when 60 kg P/fed .combined with 2 ppm B where 13.73 and 7.67 g1pot and
30 and 26 nodules/pot were obtained in the alluvial and calcareous
soils,respectively.
Average values of B, Nand P uptake increased from 2.86 and 0.95 ug
B /pot , 86. 34 and 45.73 mg N/pot and 21.36 and 9.48 mg P/pot in the
absence ofB to 4.76 and 2.11 ug B /pot ,112.3 and 55.2 mg N/pot and 34.62
and 15.81 mg P/pot with 2 ppm B and then decreased to 4.01 and 2.9 ug
B/pot, 94.1 and 49.67 mg N/ pot and 25.36and 10.88mg P/pot in the alluvial
and the calcareous soils, respectively.
The highest values of these nutrients uptake were obtained when 2 ppm
B was combined with 60 kg P/fed. except B-uptake in the calcareous soil
where the highest values of B-uptake were obtained when 6 ppm B was
combined with 60 kg P/fed.
Values ofB,N and P-uptake when 2 ppm B was combined with 60 kg
P/fed. were 6.3 and 2.69 ug B/pot, 136.4 and 64.7 mg n/pot and 47.9 and
20.28 mg P/pot in the alluvial and calcareous soils.respectively.
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The corresponding values when 60 kg P/fed.was combined with 6 ppm
B were 6.10 and 3.6 ug B/pot ,114.6 and 59.6 mg N/pot and 34.4 and 13.36
mg P/pot in the abovementioned soils,respectively.
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