Table 4 Correlation analysis of photosynthesis, dry matter accumulation and yield of maize under two straw return methods.
Method | Index | Pn (μmol·m-2·s-1) | Gs (mmol·m-2·s-1) | Tr (mmol·m-2·s-1) | Ci (μmol·mol-1) | Dry matter in R1(kg/ha) | Dry matter in R6 (kg/ha) | Yield (kg/ha) |
|---|---|---|---|---|---|---|---|---|
SF | Pn (μmol·m-2·s-1) | 1 | ||||||
Gs (mmol·m-2·s-1) | 0.900** | 1 | ||||||
Tr (mmol·m-2·s-1) | 0.939** | 0.982** | 1 | |||||
Ci (μmol·mol-1) | –0.933** | -0.995** | –0.989** | 1 | ||||
Dry matter in R1 (kg/ha) | 0.965** | 0.971** | 0.979** | –0.981** | 1 | |||
Dry matter in R6 (kg/ha) | 0.945** | 0.980** | 0.992** | –0.986** | 0.989** | 1 | ||
Yield (kg/ha) | 0.862** | 0.988** | 0.962** | –0.978** | 0.948** | 0.971** | 1 | |
FG | Pn (μmol·m-2·s-1) | 1 | ||||||
Gs (mmol·m-2·s-1) | 0.873** | 1 | ||||||
Tr (mmol·m-2·s-1) | 0.923** | 0.978** | 1 | |||||
Ci (μmol·mol-1) | –0.912** | –0.970** | –0.986** | 1 | ||||
Dry matter in R1 (kg/ha) | 0.881** | 0.971** | 0.947** | –0.948** | 1 | |||
Dry matter in R6 (kg/ha) | 0.887** | 0.989** | 0.984** | –0.978** | 0.981** | 1 | ||
Yield (kg/ha) | 0.838** | 0.975** | 0.970** | –0.973** | 0.930** | 0.979** | 1 |
