Table 1. Root mass and root:shoot ratio were a function of soil nutrient treatments (across soil N and P) and plant size.
| Response | Source of variation | df | F a | P |
|---|---|---|---|---|
| Root mass of H. ammodendron | ||||
| Soil nutrient treatments | 33 | 0.763 | 0.815 | |
| Plant size | 1 | 817.683 | <0.0001 | |
| Soil nutrient treatments × Plant size | 33 | 1.509 | 0.054 | |
| Root:shoot ratio of H. ammodendron | ||||
| Soil nutrient treatments | 33 | 0.621 | 0.944 | |
| Plant size | 1 | 25.516 | <0.0001 | |
| Soil nutrient treatments × Plant size | 33 | 0.792 | 0.779 | |
| Root mass of H. persicum | ||||
| Soil nutrient treatments | 33 | 0.069 | 0.984 | |
| Plant size | 1 | 303.827 | <0.0001 | |
| Soil nutrient treatments × Plant size | 33 | 0.210 | 0.965 | |
| Root:shoot ratio of H. persicum | ||||
| Soil nutrient treatments | 33 | 0.308 | 0.922 | |
| Plant size | 1 | 1.229 | 0.162 | |
| Soil nutrient treatments × Plant size | 33 | 0.364 | 0.994 | |
The effect of soil nutrient treatments and plant size was tested per species both in monocultures and mixtures.
aF is from GLMs using Type III sums of squares.