脐橙产量低主要是生理落果严重造成的。华盛顿脐橙在夏季落果期间,脱落的小果分为带果梗的(第一次生理落果)和不带果梗的(第二次生理落果)。谢花后,用BA处理幼果(直径0.45～0.6厘米大时)能显著减少第一次生理落果,但GA的作用较弱;减少第二次生理落果,则GA的效应显著,但与BA无关。BA和GA混合处理或先BA后GA处理,减少两次生理落果的效应均佳。试验结果指出,先用BA400ppm处理,后用GA50ppm处理的,既促进座果,又对果实品质几乎无不良影响。 Low navel orange production is mainly caused by serious physiological drop fruit. Washington navel orange fruit fall off during the fall of the small fruit into fruiting peduncle with (the first physiological drop) and non-pedicel (second physiological drop). After Xiehua, treatment of young fruits with BA (0.45-0.6cm in diameter) significantly reduced the first physiological decolouration, but the effect of GA was weaker. However, the effect of GA was significant when reducing the second decapitation, Nothing to do BA and GA mixed treatment or GA after the first BA treatment, reduce the effect of two physiological drop fruit are good. The results showed that the first with BA400ppm treatment, followed by GA50ppm treatment, both to promote fruit, but also on the quality of the fruit almost no adverse effects.