Table 3 Double-screening between C. oleifera soil physicochemical properties and yield traits and the development of stepwise regression equations
From: Role of soil nutrient elements transport on Camellia oleifera yield under different soil types
Soil layer | Double-screening stepwise regression equation | Correlation coefficient | R2 | F value |
|---|---|---|---|---|
0 ~ 20 cm | Y2 = 40.31 + 23.88 × 6 + 14.57 × 7 -1.33 × 8 + 0.329 × 9 -0.480 × 12 -31.589 × 20 | 0.989 | 0.979 | 125.890** |
Y4 = -92.56 -200.60 × 5 -796.66 × 6 + 51.43 × 8 -1.6906 × 9 + 168.52 × 10 + 40.20 × 14 + 609.91 × 20 | 0.943 | 0.889 | 18.045** | |
Y7 = 0.778 + 0.091 × 5 + 0.017 × 6 -0.006 × 8 + 0.001 × 9 + 0.001 × 10 + 0.002 × 14 + 0.07 × 20 | 0.967 | 0.934 | 31.932** | |
Y8 = 0.034 -0.054 × 6 + 0.034 × 7 + 0.008 × 8 -0.001 × 9 + 0.092 × 20 | 0.989 | 0.978 | 122.340** | |
Y9 = -0.009 + 0.005 × 5 + 0.015 × 6 + 0.001 × 8 -0.001 × 9 + 0.003 × 10 + 0.001 × 14 + 0.020 × 20 | 0.944 | 0.891 | 18.300** | |
Y11 = 0.802 + 0.057 × 5 -0.017 × 6 + 0.003 × 8 + 0.009 × 10 + 0.002 × 14 + 0.144 × 20 | 0.921 | 0.847 | 12.491** | |
20 ~ 40 cm | Y1 = 9802.91 -10422.579 × 7 + 225.129 × 8 + 48.32 × 9 + 290.99 × 14 -218.61 × 15 -494.899 × 17 -15.43 × 18 | 0.945 | 0.892 | 22.488** |
Y2 = 45.21 -0.03 × 7 -2.43 × 8 + 0.578 × 9 -0.325 × 14 + 1.376 × 15 -0.754 × 17 -0.008 × 18 | 0.992 | 0.983 | 157.042** | |
Y4 = 495.56 + 94.49 × 7 -14.94 × 8 + 3.77 × 9 + 16.66 × 14 -18.62 × 15 -28.44 × 17 -1.29 × 18 | 0.909 | 0.871 | 12.981** | |
Y6 = 0.011 + 0.011 × 7 + 0.001 × 8 -0.0006 × 9 + 0.001 × 14 + 0.001 × 15 -0.0013 × 17 | 0.914 | 0.859 | 13.830** | |
Y8 = 0.051 -0.013 × 7 + 0.004 × 8 + 0.001 × 9 -0.001 × 14 + 0.001 × 15 + 0.002 × 17 -0.001 × 18 | 0.989 | 0.978 | 122.077** |