Geographic parthenogenesis and plant-enemy interactions in the common dandelion

Table 2 Split-plot analysis of the soil feedback experiment, testing for soil effects on plant shoot biomass

Factor (d.f.)	Error term	F	p
Pre-treatment leaf length (1)	Model residual	687	<0.001
Block (2)	Model residual	41.9	<0.001
Soil (7)	Soil x Rep(Block)	2.0	0.061
contrast ‘south vs. north soils’ (1)	Soil x Rep(Block)	3.9	0.051
Soil x Replicate(Block) (110)	Model residual	2.6	<0.001
Plant population (7)	Model residual	8.9	<0.001
Soil x Plant population (49)	Model residual	1.2	0.131

Degrees of freedom are given in parentheses, the model residual has 774 degrees of freedom. The ‘south versus north soils’ contrast tests whether shoot biomass differs when plants are exposed to soils from the four southern (predominantly sexual) populations compared to soils from the four northern (apomictic) populations.

ISSN: 2730-7182