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Table 5
Direct effects, tolerance, and variance inflation factor (VIF) values for the predictor variables in model 2 (predictors grouped into first- and second-order variables).
| Response variable | Predictor variables | Adjusted R2 | Tolerance | VIF | Direct effect | Indirect effect via | |
|---|---|---|---|---|---|---|---|
| Summer cultivation | |||||||
| GY | OC | ||||||
| OY | GY | 0.986 | 0.920 | 1.087 | 0.922** | – | 0.055 |
| OC | 0.920 | 1.087 | 0.195** | 0.262 | – | ||
| SNP | PN | ||||||
| GY | SNP | 0.902 | 0.787 | 1.271 | 1.076** | – | −0.295 |
| PN | 0.787 | 1.271 | −0.639** | 0.497 | – | ||
| OC | HFP | 0.529 | 1.000 | 1.000 | 0.772* | – | – |
| Winter cultivation | |||||||
| GY | OC | ||||||
| OY | GY | 0.978 | 0.858 | 1.166 | 1.071** | – | −0.141 |
| OC | 0.858 | 1.166 | 0.373** | −0.404 | – | ||
| GY | BN | 0.671 | 1.000 | 1.000 | −0.847** | – | – |
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