Measurement and Analysis of Two-year-old Container Seedling of Cunninghamia lanceolata Experimental Forest with Exponential Fertilization

In order to study the effects of different fertilization treatments on container seedling growth of Cunninghamia lanceolata for 2 years, the tree height and ground diameter were measured in Guanzhuang state-owned forest farm, Shaxian County, Fujian Province in February 2021. The fertilization treatments contained three exponential fertilization treatments, two conventional fertilization treatments and CK treatments without fertilization. The results showed that the exponential fertilization treatment E120 (120 mg/plant) had the best growth performance in tree height and ground diameter, followed by exponential fertilization treatment E60 (60 mg/plant). Compared with CK, the average height growth of trees in two years of afforestation was 2.22 m and 2.15 m, which increased by 43.8% and 40.6% respectively. The mean ground diameter was 40.41 mm and 38.29 mm, which was 49.7% and 47.7% thicker than CK.