Prediction of the primary root growth parameters for Group Bilayer_mix_bottom and comparison with the experimental data
| Growth parameter . | Group Bilayer_mix_bottom exp. growth parameters (1·48±0·02 g cm−3) . | Predicted growth parameters for a soil bulk density of 1·48 g cm−3 . | Equivalent soil bulk density for the exp. growth parameters . | Growth parameters for an equivalent soil bulk density of 1·64±0·01 g cm−3 . |
|---|---|---|---|---|
| Elongation rate | 1·29±0·51 | 2·41 | 1·63 | 1·33 |
| Depth-vs.-total length | 0·75±0·05 | 0·84 | 1·65 | 0·75 |
| Horizontal-vs.-vertical elongation ratio | 0·66±0·13 | 0·40 | 1·64 | 0·66 |
| Tortuosity | 2·42±0·24 | 2·13 | 1·65 | 2·42 |
| Growth parameter . | Group Bilayer_mix_bottom exp. growth parameters (1·48±0·02 g cm−3) . | Predicted growth parameters for a soil bulk density of 1·48 g cm−3 . | Equivalent soil bulk density for the exp. growth parameters . | Growth parameters for an equivalent soil bulk density of 1·64±0·01 g cm−3 . |
|---|---|---|---|---|
| Elongation rate | 1·29±0·51 | 2·41 | 1·63 | 1·33 |
| Depth-vs.-total length | 0·75±0·05 | 0·84 | 1·65 | 0·75 |
| Horizontal-vs.-vertical elongation ratio | 0·66±0·13 | 0·40 | 1·64 | 0·66 |
| Tortuosity | 2·42±0·24 | 2·13 | 1·65 | 2·42 |
The linear regression models are presented in Table 3. Predicted growth parameters are calculated by putting the soil density of Group Bilayer_mix_bottom (1·48 g cm−3) into the linear models based on the linear regression of Groups Mix (Table 3, column 4). Equivalent soil bulk density was calculated by putting the growth parameters of Group Bilayer_mix_bottom into the reversed aforementioned linear models. The averaged estimated soil bulk density was then put into the same linear models (Table 3, column 4) to calculate the predicted growth parameters. The growth parameters for an equivalent soil density are similar to the measured growth parameters and are within the standard deviation of measured values.
Prediction of the primary root growth parameters for Group Bilayer_mix_bottom and comparison with the experimental data
| Growth parameter . | Group Bilayer_mix_bottom exp. growth parameters (1·48±0·02 g cm−3) . | Predicted growth parameters for a soil bulk density of 1·48 g cm−3 . | Equivalent soil bulk density for the exp. growth parameters . | Growth parameters for an equivalent soil bulk density of 1·64±0·01 g cm−3 . |
|---|---|---|---|---|
| Elongation rate | 1·29±0·51 | 2·41 | 1·63 | 1·33 |
| Depth-vs.-total length | 0·75±0·05 | 0·84 | 1·65 | 0·75 |
| Horizontal-vs.-vertical elongation ratio | 0·66±0·13 | 0·40 | 1·64 | 0·66 |
| Tortuosity | 2·42±0·24 | 2·13 | 1·65 | 2·42 |
| Growth parameter . | Group Bilayer_mix_bottom exp. growth parameters (1·48±0·02 g cm−3) . | Predicted growth parameters for a soil bulk density of 1·48 g cm−3 . | Equivalent soil bulk density for the exp. growth parameters . | Growth parameters for an equivalent soil bulk density of 1·64±0·01 g cm−3 . |
|---|---|---|---|---|
| Elongation rate | 1·29±0·51 | 2·41 | 1·63 | 1·33 |
| Depth-vs.-total length | 0·75±0·05 | 0·84 | 1·65 | 0·75 |
| Horizontal-vs.-vertical elongation ratio | 0·66±0·13 | 0·40 | 1·64 | 0·66 |
| Tortuosity | 2·42±0·24 | 2·13 | 1·65 | 2·42 |
The linear regression models are presented in Table 3. Predicted growth parameters are calculated by putting the soil density of Group Bilayer_mix_bottom (1·48 g cm−3) into the linear models based on the linear regression of Groups Mix (Table 3, column 4). Equivalent soil bulk density was calculated by putting the growth parameters of Group Bilayer_mix_bottom into the reversed aforementioned linear models. The averaged estimated soil bulk density was then put into the same linear models (Table 3, column 4) to calculate the predicted growth parameters. The growth parameters for an equivalent soil density are similar to the measured growth parameters and are within the standard deviation of measured values.
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