Table 2. Total biomass was a function of soil N, P, competition (inter- vs. intra-specific) and species.

	df	F a	P
H. ammodendron
N	5	71.51	<0.0001
P	5	100.63	<0.0001
Competition	1	1681.55	<0.0001
N × P	23	58.71	<0.0001
N × Competition	5	43.23	<0.0001
P × Competition	5	102.95	<0.0001
N × P × Competition	23	47.82	<0.0001
H. persicum
N	5	85.07	<0.0001
P	5	37.48	<0.0001
Competition	1	1291.72	<0.0001
N × P	23	198.34	<0.0001
N × Competition	5	41.18	<0.0001
P × Competition	5	83.43	<0.0001
N × P × Competition	23	46.03	<0.0001
Monoculture pots
N	5	194.18	<0.0001
P	5	35.02	<0.0001
Species	1	4949.76	<0.0001
N × P	23	151.31	<0.0001
N × Species	5	34.55	<0.0001
P × Species	5	37.69	<0.0001
N × P × Species	23	54.02	<0.0001
Mixture pots
N	5	37.52	<0.0001
P	5	164.61	<0.0001
Species	1	5084.61	<0.0001
N × P	23	49.78	<0.0001
N × Species	5	41.89	<0.0001
P × Species	5	69.90	<0.0001
N × P × Species	23	43.86	<0.0001

The effect of competition was tested per species, while the effect of species was tested separately for monocultures and mixtures.

^aF is from GLMs using Type III sums of squares.