Table 5.
Pearson correlation matrix of different variables for rice and maize. ‘*’ and ‘**’ indicate statistical significance at p < 0.05 and p < 0.01, respectively.
| Parameters | GY | N_L | N_G | N_St | N_S | BM | CHL | NDVI | Till | SY | NU_G | NU_St | NU_Tot | AEN |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rice | ||||||||||||||
| N_L | 0.200 | |||||||||||||
| N_G | 0.555** | 0.642** | ||||||||||||
| N_St | 0.585** | 0.701** | 0.802** | |||||||||||
| N_S | −0.210 | 0.057 | 0.134 | 0.226 | ||||||||||
| BM | 0.517** | 0.669** | 0.817** | 0.839** | 0.088 | |||||||||
| CHL | 0.444** | 0.700** | 0.833** | 0.859** | 0.313 | 0.826** | ||||||||
| NDVI | 0.613** | 0.552** | 0.676** | 0.700** | −0.060 | 0.772** | 0.642** | |||||||
| Till | 0.408* | 0.439** | 0.532** | 0.428* | −0.215 | 0.531** | 0.403* | 0.694** | ||||||
| SY | 0.230 | 0.558** | 0.396* | 0.334 | −0.310 | 0.329 | 0.348* | 0.365* | 0.353* | |||||
| NU_G | 0.930** | 0.404* | 0.818** | 0.756** | −0.054 | 0.709** | 0.672** | 0.710** | 0.503** | 0.308 | ||||
| NU_St | 0.370* | 0.690** | 0.711** | 0.579** | −0.164 | 0.581** | 0.605** | 0.540** | 0.483** | 0.924** | 0.548** | |||
| NU_Tot | 0.667** | 0.652** | 0.851** | 0.732** | −0.136 | 0.713** | 0.713** | 0.686** | 0.555** | 0.770** | 0.520** | 0.928** | ||
| AEN | 0.453* | −0.521** | −0.343 | −0.431* | −0.276 | −0.446* | −0.443* | −0.414* | −0.265 | 0.012 | 0.149 | −0.160 | −0.057 | |
| PFP | −0.209 | −0.560** | −0.682** | −0.753** | −0.186 | −0.742** | −0.691** | −0.824** | −0.434* | −0.125 | −0.484** | −0.390* | −0.512** | 0.663** |
| GY | N_L | N_G | N_St | BM | CHL | N_S | NDVI | AEN | PFP | NU_G | NU_St | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Maize | ||||||||||||
| N_L | 0.711** | |||||||||||
| N_G | 0.653** | 0.865** | ||||||||||
| N_St | −0.090 | −0.085 | −0.017 | |||||||||
| BM | 0.559** | 0.739** | 0.823** | −0.137 | ||||||||
| CHL | 0.679** | 0.886** | 0.935** | −0.095 | 0.851** | |||||||
| N_S | −0.283 | 0.004 | 0.051 | 0.003 | 0.224 | 0.057 | ||||||
| NDVI | 0.620** | 0.598** | 0.690** | −0.044 | 0.578** | 0.717** | −0.293 | |||||
| AEN | 0.168 | −0.497** | −0.632** | −0.248 | −0.529** | −0.621** | −0.435* | −0.343 | ||||
| PFP | −0.259 | −0.771** | −0.882** | −0.218 | −0.697** | −0.870** | −0.306 | −0.555** | 0.873** | |||
| NU_G | 0.979** | 0.799** | 0.785** | −0.068 | 0.654** | 0.784** | −0.210 | 0.669** | −0.034 | −0.451* | ||
| NU_St | 0.920** | 0.649** | 0.715** | −0.050 | 0.577** | 0.690** | −0.245 | 0.597** | 0.064 | −0.340 | 0.932** | |
| NU_Tot | 0.965** | 0.735** | 0.762** | −0.060 | 0.626** | 0.749** | −0.232 | 0.643** | 0.017 | −0.403* | 0.982** | 0.983** |
GY: Grain yield; SY: Straw/stover yield; N_L: Leaf total N; N_G: Grain total N; N_St: Straw/stover total N; N_S: Soil total N; NDVI: Normalized differential vegetation index; CHL: Chlorophyll; BM: Biomass; Till: Tiller number per hill; NU_G: N uptake in grain; NU_S: N uptake in straw/stover; NU_Tot: Total N uptake; AEN: Agronomic efficiency of N; PFP: Partial factor productivity of N.