الفهرس 
المقدمة
بعض المفاهيم الاقتصادية والرياضية للدراسةيوجد فقط 14 صفحة متاحة للعرض العام
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المستخلص
the world’s production of citrus fruits. The production of citrus has increased from 54.739 million toms in the year 1981, to 75.162 million tons in year 1991.
Brazil is situated the first rank in terms of quantity produced, among the other countries producing Oranges.
Japan Situated the first rank in terms terms of quantity produced, among the other countries producing Tangarine, The U.S.A Situated the first rank in terms of quantity produced among the other countries producing Lemon and Grapefruit.
citrusfruits represent a great importance among fruits and Horticulture crops.
The cultivated area of citrus fruits represnts about 38.93% of the cultivated area of fruits in the year 1992 in Egypt, The total production of citrus fruits represents about 51.2% of the total production of fruits in the same year.
The World’s exports of citrus frui6s has increased from 6.849 million tons with a value of 2572 million dollars in the year 1981, to 7.532 million tons with a value of 3895 million dollars in the year 1991.
Europe is considered the most exporting continent of citrus fruits, its exports represent about 41.25% of the average of the total Wold’s exports in the period 1981 - 1991,
and its value of exports represents about 44.67% of the average of the World’s value of exports in the same period.