Abstract:In recent years,Ceiba insignis is widely used in landscape.The annual growth rhythm of height and basal diameter of C.insignis seedlings is investigated,then the Logistic model is used for fitting,and the growth period is divided.The results show that the seedling response fits the Logistic quite well.During the year,there are two growth peaks of seedling height,respectively in June and August,and one growth peaks of basal diameter in August. According to the characteristics of the pattern diagram Logistic equation, the seedling stage is divided into 3 samples as blow: early growth period and rapid growth period and later growth period. The seedling stage of C. speciosa is also divided into 3 samples, which biological characteristics are similar to C. insignis. They are easy to be confused, but the time of each stage is different. Finally, rational nursery methods are applied according to the research results and the climate of Guangzhou.
