| Time | Parameter | T | P | |
| Year | S | −0.251* | −0.384** | |
| T | / | −0.100 | ||
| Whole field period | S | 0.050 | −0.218 | |
| T | / | 0.196 | ||
| Growing period | Rooting | S | 0.344** | −0.259* |
| T | / | 0.185 | ||
| Flourishing | S | 0.380** | −0.404** | |
| T | / | −0.256* | ||
| Maturing | S | 0.307* | −0.231 | |
| T | / | −0.471** | ||