Surface-check variation in boxed-heart square timber of sugi (Cryptomeria japonica) cultivars dried by the conventional kiln drying

Journal of Wood Science

Official Journal of the Japan Wood Research Society

Table 3 The total length, number, average length, and maximum length of surface checks

Cultivar	Sample	Total length (mm/m)		Number (count/m)		Average length (mm)		Maximum length (mm)
Cultivar	Sample	Mean	SD	Mean	SD	Mean	SD
Boka-sugi	B1	132	203	0.8	1.1	83	114	640
Boka-sugi	B4	767***	427	1.9**	1.0	399***	203	1560
Aya-sugi	A1	529	370	1.7	0.9	305	174	1510
Aya-sugi	A4	778*	328	2.2	1.2	412*	176	1400
Ryuunohige	R1	102	190	0.4	0.8	93	186	564
Ryuunohige	R4	661***	403	0.9*	0.8	765***	517	1610
Yabukuguri	Y1	202 b	146	1.7 a	1.1	128 b	72	630
Yabukuguri	Y4	486 b*	336	2.3 a	0.9	206 b**	129	1220
Kumotooshi	K1	465 a	459	2.1 a	1.1	203 b	126	1080
Kumotooshi	K4	1036 a***	380	1.8 a	0.9	782 a**	536	1990

End-surface checks shorter than 100 mm are excluded
There were significant differences among the samples Y1, Y4, K1, and K4 for total length and average length (P < 0.001), but not for number (P = 0.501) using ANOVA. Different letters show significant differences using the Tukey–Kramer HSD test (P < 0.05)
Asterisks show significant differences between timber 1 and timber 4 within cultivars using a paired t test (***P < 0.001, **P < 0.01, *P < 0.05)