Table 4. The chlorophyll fluorescence parameters of S. thea grown under five different fertilization treatments.

Treatment	Fo/Fm	Fv/Fm	Fv/Fo	PI_abs	SPAD
Control	0.20±0.01^b	0.80±0.01^a	3.94±0.30^a	1.47±0.42^a	34.6±2.6^a
0.5 g·L⁻¹	0.18±0.01^a	0.82±0.01^b	4.43±0.16^b	4.98±0.64^b	42.7±3.8^bc
1.0 g·L⁻¹	0.19±0.02^a	0.81±0.02^b	4.36±0.53^b	5.04±1.28^b	39.8±6.5^abc
1.5 g·L⁻¹	0.18±0.01^a	0.82±0.01^b	4.54±0.13^b	4.53±1.50^b	38.9±3.3^ab
2.0 g·L⁻¹	0.18±0.01^a	0.82±0.01^b	4.54±0.19^b	5.03±1.28^b	45.3±3.7^c

Each value is expressed as the means ± SD (n = 5).
Different letters indicate values significantly different by DMRT (Duncan's Multiple Range Test) at 5％ level (p < 0.05).