Table 2. The root collar diameter, height, and H/D ratio of S. thea under different fertilizing treatment.

Species	fertilizing treatment	Height		Root collar diameter		H/D (cm·mm)
Species	fertilizing treatment	Growth (cm)	Relative growth rate (%)	Growth (mm)	Relative growth rate (%)	H/D (cm·mm)
S. thea	Control	0.523±0.113^b,c	0.017±0.012^b	0.162±0.024^b	0.057±0.012^a	10.90±2.22^a,b
	0.5 g·L⁻¹	0.469±0.161^c	0.017±0.008^a,b	0.251±0.092^a	0.058±0.028^a	10.16±1.60^b
	1.0 g·L⁻¹	0.680±0.329^a,b	0.022±0.015^a	0.191±0.066^b	0.047±0.027^a,b	12.20±2.94^a
	1.5 g·L⁻¹	0.746±0.332^a	0.023±0.016^a	0.200±0.052^b	0.043±0.015^b	11.50±1.94^a,b
	2.0 g·L⁻¹	0.621±0.290^a,b	0.013±0.009^b	0.171±0.041^b	0.036±0.013^b	10.94±1.87^a,b

Each value is expressed as the means ± SD (n = 30).
Different letters indicate values significantly different by DMRT (Duncan's Multiple Range Test) at 5％ level (p < 0.05).