Abstract: To probe the causes of leave yellowing of Newhall navel orange in southern Jiangxi Province，leaf microelements of Newhall navel orange（Citrus sinensis Osbeck）trees on trifoliate orange [Poncirus trifoliata（L.）] rootstocks in 121 orchards in southern Jiangxi Province were analyzed. The results showed that the contents of Fe，Mn，Zn，Cu，B and Mo were（127.90 ± 21.15），（115.79 ± 136.72），（16.50 ± 4.05），（8.42 ± 9.32），（81.88 ± 33.72）and（0.36 ± 0.14）mg · kg-1，respectively. The orchards having leaf Mo，Fe，Mn，B，Cu and Zn with moderate content and above accounted for 100%，99.17%，90.91%，92.56%，62.81% and 4.96%，respectively，and those with low content for 0.83%，7.44%，7.44%，29.75% and 23.97%，respectively. Deficiency of leaf Mn，Cu and Zn were found in some orchards，1.65%，7.44% and 71.07%，respectively. The results indicated that generally there were no leaf Mo，Fe，Mn and B deficiencies in Newhall navel orange in this area. But leaf Cu content in some orchards was low，andmost orchards had leaf Zn deficiency problems. It is recommended that attention should be paid to Zn fertilizer application in navel orange orchards and Cu fertilizer is needed for the orchards with low leaf Cu content.

Key words: navel orange, southern Jiangxi Province, microelements, distribution characteristics