Table 2.
Brassica napus varieties grown in the HTP system; variety type; recommended area for cultivation in the UK; year of first inclusion the recommended list (RL), primary root length (PRL; mean ± s.d.); and final seed yield in the field. HTP data are from a pouch and wick system with seedlings imaged at 14 DAS (n = ∼40). Field data are means of six field experiments (mean ± s.d.). Varieties are ranked by PRL
| Variety | Variety type | Year on RL | Recommended area | PRL (cm) | Yield (t ha−1) |
|---|---|---|---|---|---|
| 16 | Recombinant hybrid | 2013–14 | Club root-infected land | 18·5 ± 6·7 | 5·3 ± 0·9 |
| 8 | Recombinant hybrid | 2011–12 | All UK | 17·4 ± 6·0 | 5·5 ± 0·8 |
| 18 | Recombinant hybrid | 2004–05 | Club root-infected land | 17·3 ± 8·2 | 5·2 ± 1·8 |
| 29 | Fodder | Not on RL | – | 17·3 ± 5·7 | – |
| 11 | Conventional | 2009–10 | E/W | 17·2 ± 6·7 | 5·3 ± 0·8 |
| 1 | Recombinant hybrid | 2013–14 | E/W | 17·2 ± 6·4 | 4·9 ± 0·5 |
| 9 | Recombinant hybrid | 2012–13 | E/W | 17·2 ± 5·3 | 6·0 ± 0·6 |
| 17 | Conventional | 2005–06 | All UK | 16·6 ± 5·3 | 4·6 ± 0·5 |
| 25 | Recombinant hybrid | 2009–10 | N | 16·3 ± 6·7 | 5·2 ± 0·7 |
| 14 | Conventional | 2005–06 | All UK | 16·2 ± 7·0 | 5·3 ± 0·3 |
| 10 | Conventional | 2010/11 | E/W | 16·1 ± 5·2 | 5·1 ± 1·0 |
| 2 | Conventional | Not on RL | – | 15·9 ± 5·3 | 5·2 ± 0·7 |
| 12 | Recombinant hybrid (semi-dwarf) | 2012/13 | E/W | 15·6 ± 8·3 | 4·9 ± 0·7 |
| 15 | Conventional | 2005/06 | All UK | 15·5 ± 5·0 | 4·9 ± 0·6 |
| 24 | Conventional | Not on RL | – | 15·4 ± 4·7 | 5.1 ± 0·8 |
| 21 | Recombinant hybrid | 2013/14 | E/W | 15·3 ± 6·6 | 5·5 ± 0·5 |
| 13 | Recombinant hybrid | 2008/09 | All UK | 15·2 ± 5·3 | 5·7 ± 0·7 |
| 5 | Conventional | 2011/12 | E/W | 14·9 ± 6·5 | 5·2 ± 0·5 |
| 3 | Conventional | Not reported | E/W | 14·8 ± 4·8 | 5·4 ± 0·5 |
| 26 | Conventional | 2008/09 | N | 14·7 ± 5·7 | 5·1 ± 0·7 |
| 4 | Conventional | 2012/13 | E/W | 14·7 ± 5·8 | 5·1 ± 0·9 |
| 28 | Conventional | Not reported | – | 14·1 ± 6·1 | 5·1 ± 0·7 |
| 27 | Conventional | Not reported | E/W | 14·1 ± 3·8 | 5·1 ± 0·7 |
| 6 | Conventional | 2009/10 | E/W | 14·1 ± 4·4 | 5·1 ± 0·4 |
| 32 | Conventional | 2004/05 | All UK | 13·7 ± 3·9 | 4·6 ± 0·8 |
| 23 | Conventional | Not on RL | – | 13·2 ± 6·5 | 4·7 ± 1·0 |
| 19 | Conventional | Not on RL | – | 12·9 ± 5·0 | 4·3 ± 0·8 |
| 20 | Conventional | 2010/11 | N | 12·5 ± 5·1 | 4·9 ± 1·1 |
| 7 | Conventional | 2010/11 | E/W | 12·4 ± 5·7 | 5·2 ± 0·8 |
| 30 | Conventional | 2005/06 | All UK | 12·3 ± 4·7 | 4·6 ± 0·5 |
| 31 | Conventional | Not on RL | – | 11·0 ± 4·0 | 4·9 ± 0·5 |
| 22 | Recombinant hybrid | 2011/12 | E/W | – | 5·5 ± 0·5 |
–, not applicable.
N, North Region, comprising Scotland, Northern Ireland and Northern England; E/W, East/West Region, comprising England (south of Teesside) and Wales.
Variety 18 did not grow in the field in 2012–13 (i.e. n = 4). Variety 22 did not grow in the HTP system.