Table 7. Nitrogen, sulfur and chlorine content of wood chips from logging residues by harvesting and processing methods.
(Unit : W-%)

Items	Harvesting and processing methods
	CTL								WT
	Unscreened				Screened				Unscreened				Screened
	Avg.	Min.	Max.	S.D.a	Avg.	Min.	Max.	S.D.a	Avg.	Min.	Max.	S.D.a	Avg.	Min.	Max.	S.D.a
N	0.4591*	0.4497	0.4722	0.0117	0.3012*	0.2754	0.3197	0.0230	0.3842*	0.3815	0.3864	0.0025	0.3376*	0.3115	0.3681	0.3376
S	0.0689*	0.0523	0.0801	0.0147	0.0226*	0.0193	0.0243	0.0028	0.0230*	0.0223	0.0234	0.0006	0.0197*	0.0195	0.0199	0.0002
Cl	n.d.a				n.d.a				n.d.a				n.d.a

t-test P<0.05,
Standard deviation,
n.d. : not detectable