柑桔是世界的重要果品,分布在北纬45°至南纬41°之间,遍及世界92个以上的国家和地区。1980年世界柑桔总产量5640万吨,其中13个国家在100万吨以上;1982年全世界为5400万吨,1983年起由于冻害,美国减产;1985年世界产量仅3510万吨,巴西跃居美国之上;1986年又有所回升。 世界柑桔的主要品种是甜橙、宽皮桔、葡萄柚、柠檬。发展的总趋势是以甜橙为主,占绝对优势,在70％以上,美国甜橙占国内柑桔总产的80％左右,在世界市场上受到广泛的欢迎。不少主产国在甜橙发展中都十分重视周年供应问题,注意早、中、晚熟品种配套发展。一般早、中熟品种在50％以 Citrus is an important fruit of the world and is distributed between 45 ° north latitude and 41 ° south latitude, covering more than 92 countries and regions in the world. In 1980, the world’s citrus output was 56.4 million tons, of which 13 were over 1 million tons; the world’s 54 million tons in 1982; the frost damage on the United States since 1983; and the U.S. reduced its output. In 1985, the world’s output was only 35.1 million tons, Ranking above the United States; it rose again in 1986. The world’s main citrus varieties are sweet orange, peel, grapefruit, lemon. The general trend of development is mainly of sweet orange, which occupies the absolute superiority. At 70% or above, the United States of sweet orange accounts for about 80% of the total domestic citrus production and is widely welcomed in the world market. In the development of sweet orange, many major producing countries attach great importance to the issue of annual supply, paying attention to the development of early, middle and late maturing varieties. Generally early, middle-aged varieties in 50%