柑桔种类品种之多栽培之盛冠于群果,据1979年统计,世界年产量达5410万吨,居各种水果首位。柑桔的主要栽培种大半原生我国,广传播于世界各地。其经济栽培区概集中于温带南部,而热带地区栽培不盛。这是因为生产与贮藏销售相关甚切,热带四季常热,柑桔好暖,虽可无冻害之忧,但气候炎热湿润,病虫多,栽培管理须多费工本,且果实成熟采收后易腐烂,不利于久贮与运销。反之,温带南部四季分明,冬寒夏热,春秋清凉,柑桔随春暖萌芽,开花结实,乘夏热欣欣向荣,果实肥大,至秋凉冬寒,生 According to the statistics of 1979, the world’s annual output reached 54.1 million tons, ranking the first place for various kinds of fruits. Most of the main cultivated citrus native China, widely disseminated around the world. Its economic cultivation area is concentrated in the southern temperate zone, while cultivation in the tropics is not full. This is because production and storage sales are very much related to the tropical hot seasons, citrus is good, although there is no fear of frostbite, but the climate is hot and humid, pests and diseases, cultivation and management to be more cost-effective, and the fruit mature harvest Perishable, is not conducive to long storage and distribution. Conversely, the temperate southern four distinct seasons, the winter cold in summer, cool in spring and autumn, citrus sprout with the spring, flowering strong, by the summer heat thriving, fruit hypertrophy, autumn and winter cold, students