Table 2. Effect of polypropylene mulching treatments on height and root collar diameter growth, and H/D ratio of Quercus glauca Thunb. seedling

Treatment	Height		Root collar diameter		H/D ^y ratio(cm/mm)
Treatment	Growth(cm)	RGR ^z (cm/day)	Growth(cm)	RGR(cm/day)	H/D ^y ratio(cm/mm)
60g/m² overlapping	25.17±9.53^a	0.66±0.36^a	6.03±1.55^a	0.16±.050^a	4.61±0.72^a
60g/m² hole drilling	22.16±9.57^a	0.57±0.36^b	5.03±1.42^b	0.11±0.05^b	3.66±1.80^ab
80g/m² overlapping	21.38±6.99^a	0.53±0.24^b	5.09±1.42^b	0.11±0.04^b	3.49±0.27^bc
80g/m² hole drilling	20.60±10.43^a	0.51±0.38^b	5.02±1.82^b	0.11±0.06^b	3.84±0.63^ab
Control	14.53±7.55^b	0.25±0.28^c	3.89±1.18^c	0.05±0.04^c	2.74±0.63^c

Relative rowth rate.
Height/root collar diameter.
Data are the Mean±SE from the three replicates. Difference letters indicate treatments are significant difference at p<0.05 by Ducan’s multiple range test.