Relationship between the relative germination rate and relative seed production per plant in each crop type.

<p>Symbols indicate the crop type (winter cereals = circle, oilseed rape = cross, maize = square, sunflower = triangle). Relative germination rates were not correlated with the relative seed production rates in winter cereals (Spearman correlation test, <i>ρ</i> = -0.39, <i>P</i>-value = 0.103), oilseed rape (<i>ρ</i> = -0.32, <i>P</i>-value = 0.185), maize (<i>ρ</i> = -0.76, <i>P</i>-value = 3.34e-4) and sunflower (<i>ρ</i> = -0.40, <i>P</i>-value = 0.094), but were negatively correlated in maize.