Table 2.
Correlation coefficient (r) and P values of the correlation analysis (Pearson test) between the sonic speed and root biomass density revealed by Root Detector and Fastrak, respectively, in two olive trees at different distance from trunk (0–40, 0–80 and 0–120 cm) and soil depth (D30, D60, D90).
| 0–40 cm | 0–80 cm | 0–120 cm | ||
|---|---|---|---|---|
| Tree09 | D30 | −0.030NS | −0.129NS | −0.188NS |
| D60 | 0.166NS | 0.091NS | −0.168NS | |
| D90 | 0.187NS | 0.253NS | 0.031NS | |
| Tree11 | D30 | 0.611*** | 0.718*** | 0.484** |
| D60 | 0.181NS | 0.467** | 0.284NS | |
| D90 | 0.164NS | 0.412* | 0.242NS | |
P values: *P < 0.05; **P < 0.01; ***P < 0.001; NS not significant.