Table 1 Degrees of freedom (D. F.), χ2 and P-value of generalized a linear mixed-effects model testing the effects of seed density, species (Ipomoea murucoides, I. pauciflora), and type of aqueous extract (seed extract of I. murucoides, seed extract of I. pauciflora, and water) on seed germination of I. murucoides and I. pauciflora
From: Density-dependent effect of allelopathy on germination and seedling emergence in two Ipomoea species
| Source of variation | D. F. | X 2 | P |
|---|---|---|---|
| Aqueous extract | 4 | 286.8 | 2.2e−16 |
| Seed species | 1 | 1.04 | 0.3076 |
| Seed density | 1 | 14.13 | 0.00017 |
| Aqueous extract × seed species | 4 | 35.35 | 3.93e−07 |
| Aqueous extract × seed density | 4 | 71.71 | 9.86e−15 |
| Seed species × seed density | 1 | 0.80 | 0.3706 |
| Aqueous extract × seed species × seed density | 4 | 9.81 | 0.043 |