Table 4
Direct effects of first-order predictor variables on oil yield and measures of collinearity in model 1 (all predictor variables as first-order variables over oil yield as response variable).
| Summer cultivation | Winter cultivation | |||||
|---|---|---|---|---|---|---|
| Predictor variables | Direct effect | Tolerance | VIF | Direct effect | Tolerance | VIF |
| RL | 0.038 | 0.445 | 2.247 | 0.000 | 0.461 | 2.168 |
| RW | −0.028 | 0.481 | 2.079 | 0.004 | 0.000 | 2515.267 |
| PH | 0.006 | 0.412 | 2.428 | 0.000 | 0.005 | 192.656 |
| HFP | 0.0130 | 0.217 | 4.603 | −0.001 | 0.013 | 77.466 |
| BN | −0.098 | 0.271 | 3.691 | 0.000 | 0.034 | 29.523 |
| PN | −0.076 | 0.972 | 1.028 | 0.000 | 0.064 | 15.614 |
| PW | −0.056 | 0.725 | 1.379 | 0.001 | 0.029 | 34.776 |
| SNP | −0.094 | 0.389 | 2.570 | 0.001 | 0.022 | 46.056 |
| SW | −0.314** | 0.085 | 11.798 | 0.037 | 0.029 | 34.776 |
| BIO | 0.201** | 0.139 | 7.170 | 0.000 | 0.037 | 27.358 |
| SR | −0.022 | 0.680 | 1.471 | 0.027 | 0.003 | 354.668 |
| DM | −0.032 | 0.948 | 1.055 | 0.000 | 0.088 | 25.494 |
| GY | 1.060** | 0.235 | 4.254 | 1.096** | 0.011 | 94.497 |
| OC | 0.192** | 0.475 | 2.103 | 0.320** | 0.137 | 7.326 |
| TSW | 0.059 | 0.322 | 3.106 | 0.122 | 0.150 | 6.653 |
| HI | −0.095 | 0.555 | 1.802 | 0.000 | 0.088 | 11.306 |
RL: root length; RW: root weight; PH: plant height; HFP: height of first pod; BN: branch number; PN: pod nember; PW: pod weight; SNP: seed number per pod; SW: seed weight; BIO: biological yield; SR: stem ratio; DM: dry matter; GY: grain yield; OC: oil content; OY: oil yield; TSW: total seed weight; HI: harvest index.
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