Abstract: Chlorosis often occurs in camphor trees (Cinnamomum camphora) which are used for municipal landscaping. Chlorosis not only shows the poor growth of trees, but also affects the beauty of the landscape. Taking chlorosis camphor tree on both sides of main streets of Zhangjiagang City as an object, and normal camphor tree as the control, nutrient content, SPAD value and enzyme activity of leaves were measured to diagnose the nutritional characteristics of camphor chlorosis. The results indicated that total phosphorus content of chlorosis trees were higher than normal trees, while the contents of total nitrogen, total potassium, SPAD value, active iron, total iron, catalase and peroxidase activities were lower. There was antagonism between active iron and total phosphorus, while there was synergy between the active iron and total nitrogen, total potassium, SPAD value, total iron, catalase, peroxidase.

Key words: camphor, municipal landscaping, chlorosis, fertilizing