Table 1.
Description of measured and derived traits
| Trait |
Abbreviation |
Description |
Units |
|---|---|---|---|
| Shoot weight | SHWT | Dry weight after 2 years | g |
| Root weight | RTWT | Dry weight after 2 years | g |
| Total weight | TOTWT | Sum of shoot and root weight | g |
| First-year height | HT1 | From root collar to base of terminal bud | cm |
| Second-year height | HT2 | From root collar to base of terminal bud | cm |
| Height increment | HTINC | Second-year height minus first-year height | cm |
| Second-year stem diameter | DIA | At 1 cm above root collar after 2 years | mm |
| Root length | RTLG | From root collar to tip of longest root | mm |
| Root : shoot ratio | RTSH | Ratio of dry weights after 2 years | g g −1 |
| Taper | TAPER | Ratio of second-year diameter to second-year height | mm cm −1 |
| First-year bud-set | BS1 | First visible terminal-bud scales at end of first growing season | days since 1 January |
| Second-year bud-set | BS2 | First visible terminal-bud scales at end of second growing season | days since 1 January |
| Second-year bud-burst | BB2 | First green needles from terminal bud | days since 1 January |
| Rate of emergence | EM | Cumulative number of seedlings emerged in a plot on a probit scale | probits d−1 |
| Propensity to second flush | FLUSH | Proportion of 2-year seedlings with lammas growth of terminal leader | proportion |
| Length of second flush | FLLG | Distance from visible bud scar to base of terminal bud | cm |