Phosphorus fertilization with Cleyera japonica seedlings

Based on a pot experiment，the effects of phosphorus fertilization on growth and physiological indexes and phosphorus content in leaves of one-year-old Cleyera japonica seedlings were studied. Seven P（P2O5） levels were set，0（ck），0.125，0.250，0.375，0.500，0.625 and 0.750 gpot-1. Results showed that （1） with increasing levels of P from 0 to 0.500 gpot-1，growth and physiological indexes in C. japonica seedlings increased，whereas with P increases over 0.500 gpot-1，all indexes decreased. Also，（2） P in leaves increased with increasing levels of P from 0 to 0.500 gpot-1 but decreased gradually with further P. Finally，（3） quadric relationships between growth indexes and P were noted. Based on growth and physiological indexes for one-year-old C. japonica seedlings，proper application of P was from 0.441 to 0.603 gpot-1.［Ch，2 fig. 5 tab. 11 ref.］