Total limb length of Ginkgo biloba L. following 3 years of forced chilling (group one); 1 year of ambient chilling (998 hours) and 2 years of forced chilling (group two); and 2 years of ambient chilling (998 and 1,487 hours) and 1 year of forced chilling (group three).z
| Chill hoursy | Group onex | Group twox | Group threex |
|---|---|---|---|
| 100 | 312 ab | 180 a | 159 b |
| 200 | 168 b | 327 a | 234 ab |
| 300 | 225 ab | 132 a | 186 b |
| 400 | 269 ab | 321 a | 147 b |
| 500 | 217 ab | 158 a | 227 ab |
| 600 | 446 a | 290 a | 371 ab |
| 700 | 249 ab | 251 a | 147 b |
| 800 | 397 ab | 338 a | 187 b |
| 900 | 424 a | 179 a | 414 ab |
| 1,000 | 252 ab | 236 a | 377 ab |
| 1,100 | 445 a | 283 a | 483 a |
| 1,200 | 281 a | 255 a | 468 a |
| Regression equation | y = 224.3 + 0.122x | NS | y = 102.0 + 0.279x |
| r | 0.27 | — | 0.51 |
| p-value | 0.062 | — | 0.001 |
↵zTotal limb length measured in cm from trunk to tip of lateral bud, at the end of 3 years, 1999–2002.
↵yChilling was applied to each treatment at 4°C (38°F) in a cooler in 100-hour increments following 200 hours of ambient chilling to ensure dormancy prior to treatments.
↵xMeans within a column with the same letter are similar according to Duncan’s multiple range test (α = 0.05).