Table 5.
Correlations of root length (RL), surface area (SA), projection area (PA), root volume (V), root diameter (AD), nodule number (NN), nodule weight (NdW), and nitrogen content of the shoot (NS) and root (NR) of soybean inoculated with Bradyrhizobium japonicum USDA110 in hydroponic culture with high nitrogen, phosphorous, and magnesium supplies (HNHP (N−3,000 μmol/L and P−250 μmol/L) and HNHMg (N−3,000 μmol/L and Mg−1,000 μmol/L).
| Parameter | Treatments | RL | SA | PA | V | AD | NN | NdW | NS |
|---|---|---|---|---|---|---|---|---|---|
| SA | HNHP | 0.53** | 1.00 | ||||||
| HNHMg | 0.35** | ||||||||
| PA | HNHP | 0.11* | 0.48** | 1.00 | |||||
| HNHMg | 0.64** | 0.69*** | |||||||
| V | HNHP | −0.17* | 0.60** | 0.77*** | 1.00 | ||||
| HNHMg | 0.22* | 0.91*** | 0.76*** | ||||||
| AD | HNHP | −0.31* | 0.63** | 0.55** | 0.86*** | 1.00 | |||
| HNHMg | 0.49** | 0.69*** | 0.98*** | 0.81*** | |||||
| NN | HNHP | −0.22* | 0.58** | 0.15* | 0.52** | 0.82*** | 1.00 | ||
| HNHMg | 0.09 | 0.73*** | 0.12* | 0.45** | 0.09 | ||||
| NdW | HNHP | 0.02 | 0.06 | −0.79*** | −0.47** | −0.07 | 0.30* | 1.00 | |
| HNHMg | 0.84*** | −0.01 | 0.20* | −0.19* | 0.00 | 0.02 | |||
| NS | HNHP | −0.15* | −0.25* | 0.05 | −0.17* | −0.13* | −0.48** | −0.01 | 1.00 |
| HNHMg | −0.38** | −0.53** | −0.43** | −0.63** | −0.47** | −0.05 | −0.08 | ||
| NR | HNHP | 0.36** | 0.78*** | 0.08 | 0.32* | 0.47** | 0.38** | 0.46** | 0.21* |
| HNHMg | 0.24* | 0.14* | −0.02 | −0.14* | −0.01 | 0.34** | 0.04 | −0.02 |
Significance levels for positive correlations are
*
P < 0.05 (significant),
**
P < 0.01 (highly significant), and
***
P < 0.001 (extremely significant).