在 7月初柑定果期用 10 0～ 2 0 0mg/L细胞分裂素BA(N6 苄基腺嘌呤 )叶面喷布桔树 ,可显著促进果实的生长和膨大。处理组果实横径≥ 6 .5cm的大桔果百分率较对照增加 7.51～ 2 2 6 5个百分点 ,而横径 <5.5cm的小桔果百分率则较对照减少 12 .59～ 2 4 .6 6个百分点 ,且增加了单果重。BA促进果实增大的效应随施药时间的提早而增强。BA处理还可提高果实的固形物、总糖、Vc和还原糖的含量 ,降低总酸含量 ,使果实品质得到改善。3H 葡萄糖标记试验结果表明 ,BA促进柑果实增大与其加剧标记叶同化产物的输出 ,促进同化产物向果实转移有关 At the beginning of July, the citrus fruit was sprayed with 100 ~ 200 mg / L cytokinin BA (N6 benzyladenine) foliar spray, which could significantly promote fruit growth and enlargement. The percentage of large oranges with fruit diameter> 6.5cm increased by 7.51-2.265% compared with the control, while the percentage of small oranges with diameter <5.5cm decreased by 12.59-2.46.6 A percentage point, and increase the weight of fruit. The effect of BA on fruit enlargement increased with the earlier application time. BA treatment can also improve the fruit solids, total sugar, Vc and reducing sugar content, reduce the total acid content, so that the fruit quality is improved. 3H glucose labeling test results show that BA promote the growth of the fruit of Pseudostellariae and its role in exaggerating the output of labeled leaf assimilation products and promote the transfer of assimilation products to the fruit