Table 2.

F-statistics and P-values for burial time, burial depth and their interaction relating to the traits of experimental plants as determined by ANOVA, together with corresponding degrees of freedom

	Burial time					Burial depth (treatment)					Time × treatment
Character	d.f.	F	P	d.f.	F	P	d.f.	F	P
Enhancement ratio
Shoot height	2, 94	43·96	<0·001	4, 94	74·52	<0·001	8, 94	7·63	<0·001
Branch number	2, 94	0·27	0·762	4, 94	199·96	<0·001	8, 94	17·06	<0·001
Leaf number	2, 94	10·84	<0·001	4, 94	170·23	<0·001	8,94	11·69	<0·001
Branch length	2, 94	18·04	<0·001	4, 94	76·33	<0·001	8, 94	18·26	<0·001
Photosynthetic rate	2, 81	0·46	0·634	3, 81	60·39	<0·001	6, 81	2·33	0·04
Transpiration rate	2, 81	0·03	0·968	3, 81	19·48	<0·001	6, 81	0·49	0·81
Water use efficiency	2, 81	2·37	0·100	3, 81	7·84	<0·001	6, 81	1·33	0·25
Leaf water content	2, 81	4·96	0·009	3, 81	5·46	0·002	6, 81	6·14	0·001
Biomass
Leaf	2, 94	101·73	<0·001	4, 94	93·62	<0·001	8, 94	34·27	<0·001
Shoot	2, 94	76·74	<0·001	4, 94	78·08	<0·001	8, 94	23·40	<0·001
Root	2, 94	135·90	<0·001	4, 94	90·84	<0·001	8, 94	35·58	<0·001
Biomass allocation
Leaf	2, 94	4·03	0·021	4, 94	10·14	<0·001	8, 94	12·43	<0·001
Shoot	2, 94	8·61	<0·001	4, 94	108·53	<0·001	8, 94	40·38	<0·001
Root	2, 94	15·26	<0·001	4, 94	79·026	<0·001	8, 94	10·55	<0·001
Newly produced
Shoot height				3, 26	20·13	<0·001
Lateral branch				3, 26	30·76	<0·001
Leaves				3, 26	19·98	<0·001
Root length
>0·2 cm				4, 27	33·98	<0·001
0·1–0·2 cm				4, 27	24·08	<0·001
<0·1 cm				4, 27	298·72	<0·001