الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Soybean ( Glycin max L.) has been cultivated in Japan,
India and China since ancient times.
ties are grown in these countries as
in China and Japan. It is grown in
Hundreds of variea
food crop, especially
the Middle West and
South for feed, forage and green manure crops, but its
important use is as a seed for oil and by-products.
In Egypt, the soybean is grown for oil and feed and
as a soil-improving crop particularly in the soil under
reclamation. The soybean was introduced since 50 years,
but it was cultivated in narrow scale. Now it is going
to become of much importance. For instance, the total
cultivated area was 624 feddans in 1966 which produced 359
tons of seeds. The area was increased in 1977 to 33138
feddan to produce 26496 of seeds. Since the government
has been adopted the green revolution in Egypt, the soybean
has been taken into consideration where the cultivated
area by soybean was increased to reach more than 150,000
feddan in 1987.
In Egypt, several efforts had been devoted to improve
soybean plantation. As a matter tof fact, the production
of soybean seeds or seeds protein and oil is still far
fellow the market demands. Hereafter, the committee of
world soybean Res. con f. III ( 1 2 - 17 August, 1984, Iowa- 2 -
State Univ., Ames, Iowa, U.S.A.) announced that Egyptian
scientist achieved the highest soybean yield for unit area
comparing with the other countries at all the world. Thus,
the improvement of the cultivation and the production of
soybean is still the target of several workers. Therefore,
further achievement in this respect is of great importance.
It is well known that soybean plantation and production
are affected by so many integrated factors such as
soil types, mineral nutrition, farm management, irrigation,
enviromental and micro climatic conditions.
The previous work which had been carried by the
author in 1981 was to study the response of soybean plants
to soil moisture stress and some chelated compounds under
calcareous soil conditions.
In continuation to the prevailing object it. seems
that nutritional aspect is of major interest. In this
respect, application of P and Zn, their interaction, the
factors affecting their availability to uptake by plants,
in relation to some microelements uptake, chemical and
physiological processes, yield and quality of soybean
were enormously questioned.
from a nutritional point of view, phosphate ions are
involved in major chemical reactions in soil and in numerous- 3 -
metabolic reactions in plants. Consequently, P influences
on, or is influenced by, the availability or utilization
of many other elements, both essential and nonessential.
Interactions between P and Zn in soil are the manifestations
of specific chemical reactions, few of which
have been quantitavely defined. Qualitatively, however,
these reactions have found useful expressions in terms of
nutrient availability and efficiency of fertilizers.
Efficiency of P fertilizers has long been associated with
chemical reactions involving phosphate and certain cations,
especially Ca, Al, Fe and Zn.
Phosphorus plays a key role in many metabolic pathways
within the plant. These various metabolic reactions
are dependent on other ions either as activators of enzyme
systems or as vehicles for electron transfers. The interaction
of phosphorus with such ions within the plant is of
importance under two separate conditions : (i) when adequate
or excess levels of P affected the utilization of
other ions by the plant and (ii) When adequate or excess
levels of other inorganic nutrients affect the utilization
of phosphorus.
The present work was conducted to investigate the
interacted effects of phosphorus and zinc on some micrO
elenents uptake, some physiological processes, yield and
quality o f soybean seeds. In addition, the mutual effects
of P and Zn on their absorption, translocation and utilization
by soybean plants were also studied by using the
radioactive isotope of them ”P32 & zn” as a tracer
technique.