脐橙4号系中国农业科学院柑桔研究所选育出来的新品种。我地于1996年引进接穗进行高接换头,1997年恢复树冠,1998年株产15.6千克,2001年株产53千克,2004年株产65千克。该品种果实大,平均单果重260克;果实表面光滑,橙红色,鹅蛋形或倒卵圆形;脐小,多闭脐;味浓甜化渣,贮后富有浓郁 Navel orange 4 Department of Chinese Academy of Agricultural Sciences citrus breeding new varieties. I introduced the scion in 1996 to carry out high replacement, crown recovery in 1997, producing 15.6 kg in 1998, producing 53 kg in 2001 and producing 65 kg in 2004. The variety of fruit, the average fruit weight 260 grams; fruit surface smooth, orange-red, goose-shaped or obovate; umbilical small, multi-closed umbilical; taste thick sweet residue, rich after storage