Table 4.

Tannin concentrations in leaves, stems, roots, in harvestable biomass and in the entire plant

				Onobrychis		Lotus		Cichorium
				Estimate	P	Estimate	P	Estimate	P
Leaves	Intercept		τ0	75·99	***	37·91	***	4·29	***
			c×τ1	−2·46	0·579	9·34	**	0·82	0·496
	Temporal	t	τ2	2·33	***	1·72	***	−0·11	0·527
		t	c×τ3	−0·67	0·469	1·09	0·061	0·099	0·695
Stems	Intercept		τ0	24·88	***	12·03	***	7·8	**
			c×τ1	−2·21	0·591	0·81	0·563	–	–
	Temporal	t	τ2	−1·25	0·131	−0·19	0·376	−0·37	0·51
		t	c×τ3	0·69	0·489	0·42	0·156	–	–
Roots	Intercept		τ0	3·13	***	27·35	***	2·04	*
			c×τ1	1·74	0·64	−2·97	0·491	0·88	0·453
	Temporal	t	τ2	−0·29	0·056	0·53	0·404	−0·07	0·69
		t	c×τ3	−0·14	0·482	0·39	0·681	0·09	0·734
Harvest	Intercept		τ0	63·58	***	24·16	***	4·57	***
			c×τ1	−4·1	0·216	4·16	**	0·53	0·656
	Temporal	t	τ2	0·79	0·11	0·33	0·083	−0·06	0·716
		t	c×τ3	−0·5	0·467	0·39	0·15	0·05	0·85
Whole plant	Intercept		τ0	46·72	***	23·12	***	4·05	***
			c×τ1	−4·12	0·093	2·64	**	−0·11	0·882
	Temporal	t	τ2	−0·51	0·154	0·28	*	−0·05	0·652
		t	c×τ3	−0·36	0·48	0·21	0·292	−0·05	0·761
	Cultivar×week			−0·05	0·467	0·039	0·15	0·005	0·85

Estimated coefficients and P-values of the multiple linear regression models presented in eqn (3), for each species. Intercepts can be interpreted as the tannin concentration in mid-season, the sum of the temporal coefficients as the weekly change in tannin concentration (mg CT g⁻¹ d. wt week⁻¹).

* P<0·05; ** P<0·01; *** P<0·001.