Table 1.

Dry weights and P contents of the whole plant of white lupin, faba bean and maize grown with low (LP) (1 µmol L⁻¹) and high P (HP) (250 µmol L⁻¹) under two N forms [ca(NO₃)₂ and NH₄NO₃] for 7, 12 and 16 days.

N forms	P supply	White lupin			Faba bean			Maize
		7 d	12 d	16 d	7 d	12 d	16 d	7 d	12 d	16 d
		Plant biomass (g dry weight per plant)
Ca(NO3)2-N	LP	0.12	0.28	0.47	0.46	0.72	1.11	0.34	0.56	0.72
	HP	0.14	0.30	0.53	0.42	0.80	1.38	0.27	0.84	1.57
NH4NO3-N	LP	0.12	0.18	0.47	0.43	0.71	1.07	0.37	0.61	0.79
	HP	0.12	0.21	0.50	0.43	0.77	1.37	0.34	1.01	1.99
LSD (P = 0.05)		0.01	0.03	0.04	0.04	0.08	0.14	0.03	0.06	0.08
P level		n.s.	n.s.	n.s.	n.s.	n.s.	**	**	***	***
N form		n.s.	***	n.s.	n.s.	n.s.	n.s.	**	**	***
P × N		n.s.	n.s.	n.s.	n.s.	n.s.	n.s.	n.s.	*	***
		P content (mg P per plant)
Ca(NO3)2-N	LP	1.04	1.62	1.67	3.39	4.06	4.33	0.89	0.73	0.75
	HP	1.48	2.34	3.96	5.37	8.34	15.46	4.38	10.29	19.90
NH4NO3-N	LP	1.05	1.18	1.67	3.53	4.60	5.01	0.97	0.87	0.96
	HP	1.34	1.88	4.69	5.98	8.62	15.79	5.47	15.06	25.11
LSD (P = 0.05)		0.12	0.26	0.38	0.60	1.52	2.03	0.62	1.28	2.17
P level		***	***	***	***	***	***	***	***	***
N form		n.s.	**	n.s.	n.s.	n.s.	n.s.	*	**	**
P × N		n.s.	n.s.	n.s.	n.s.	n.s.	n.s.	*	**	**

*P ≤0.05;

**P < 0.01;

***P < 0.001; n.s. not significant at P = 0.05.