. 2017 Mar 28;8:420. doi: 10.3389/fpls.2017.00420

Table 4.

Effects of soil bulk density, axial and lateral root numbers (NoAx and NoLat, respectively) based on linear mixed model predictors (Eq. 1) and their interaction on plant height using analysis of covariance model: bulk density (1.3, 1.45, and 1.6 g cm^-3) was treated as a factor and transformed root number (square root) was treated as continuous variable; numbers indicate proportion of variance (SS_xx/SS_tot) in percentage explained by each effect; ^∗∗ denotes significant effects at p < 0.01, n.s., denotes non-significant effects and R² represents multiple r-squared.

Effect	SS_xx/SS_tot
Bulk density	16.3^∗∗
NoAx^0.5	70.6^∗∗
Bulk density : NoAx^0.5	0.1 n.s.
R²	0.87
Bulk density	0.5 n.s.
NoLat^0.5	78.4^∗∗
Bulk density : NoLat^0.5	0.5 n.s.
R²	0.79