华盛顿脐橙(简称华脐),主产美国、澳大利亚,在我国栽培较多。该品种果大、美观、早熟、品质极优、较耐寒,但普遍表现低产,在一些高热地区不易结果。针对上述问题,贵州省柑桔研究所、省农学院开展了育种研究。一、选育经过从1973年开始,从贵州毕节(年平均气温15℃左右)地区引来华脐种子,在贵州农学院实验场播种培育。通过19年的多次筛选,并采用高接(枳砧、温州蜜柑中间砧,枳 Washington navel orange (referred to as Hua na), the main production of the United States, Australia, more in our cultivation. The varieties of fruit large, beautiful, precocious, excellent quality, more resistant to cold, but generally low performance, difficult to get results in some areas of high fever. In response to these problems, Guizhou Province Institute of Citrus, Provincial Agricultural College conducted a breeding study. First, breeding After 1973, from Bijie, Guizhou (annual average temperature of about 15 ℃) to attract Chinese umbilical seeds in Guizhou Agricultural College experimental field planting and breeding. Through 19 years of screening, and the use of high access (orange, orange satsuma intermediate anvil, trifoliate orange