美国农业部园艺所遗传学家Hearn等已培育出了三个甜橙新品种:日星(Sunstar),中甘(Midsweet)和园丁(Gardner)。他们于1962年着手研究,1976年选出了目前这几个品系,现正处在结果期。这三个品种既可供鲜销,又可用于加工果汁,果汁色泽较好。桔农和加工者们对上述新品种具有极大的兴趣,因为它们能向果汁市场目前被进口果汁所占据的局面提出挑战。 美国佛罗里达州桔产区,早熟品种哈姆林于12月底到2月初成熟;迟熟品种伏令夏 Hearn, a geneticist at the Horticultural Institute of the U.S. Department of Agriculture, has developed three new orange varieties: Sunstar, Midsweet and Gardner. They started their studies in 1962, and in 1976 they selected the present strains and are now in the final stages of their lives. These three varieties are both available for sale, but also for the processing of fruit juices, fruit juice color is better. Orange farmers and processors are greatly interested in the new breeds as they pose challenges to the current market share of the juice market in imported fruit juices. The United States, Florida orange-producing areas, early maturing varieties Hamlin in late December to early February mature; late varieties of summer