Experiment 1: Contrast P-values determined using PDIFF, GLM procedure (SAS) for number of roots per cm2. P-values were from roots counted after slicing soil at 2-cm thickness from the bottom and side of containers with Pouteria obovata and Calophyllum soulattri growing at 2 levels of soil compaction: 1.45 g cm−3 and 1.66 g cm−3.
| Per cm2 surface area root ends | ||||
|---|---|---|---|---|
| Contrast P-values | ||||
| 2 cm from bottom | 4 cm from bottom | 2 cm from exterior side | 4 cm from exterior side | |
| Pouteria obovata compaction level 1 vs. 2 | 0.21 | 0.087 | 0.151 | 0.107 |
| Calophyllum soulattri compaction level 1 vs. 2 | 0.101 | 0.23 | 0.096 | 0.07 |