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Citrus fruits are the highest value fruit crop in terms of international trade. There are two main markets for citrus fruit: * the fresh fruit market * the processed citrus fruits market (mainly orange juice) Most citrus production is accounted for by oranges, but significant quantities of grapefruits, pomeloes, lemons and limes are also grown. ==History== While the origin of citrus fruits cannot be precisely identified, researchers believe they began to appear in southeast Asia at least 4000BC. From there, they slowly spread to northern Africa, mainly through migration and trade. During the period of the Roman Empire demand by higher-ranking members of society, along with increased trade, allowed the fruits to spread to southern Europe. Citrus fruits spread throughout Europe during the Middle Ages, and were then brought to the Americas by Spanish explorers. Worldwide trade in citrus fruits didn't appear until the 19th century and trade in orange juice developed as late as 1940. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Citrus production」の詳細全文を読む スポンサード リンク
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